diff --git a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Plugins/x86/NatNetLib.dll b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Plugins/x86/NatNetLib.dll
deleted file mode 100644
index 5bb72641d..000000000
--- a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Plugins/x86/NatNetLib.dll	
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:8dce3d5bca185ff7241a0dab86bf33f79c50731f85e5d4b342cfd112d55ba858
-size 136192
diff --git a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Plugins/x86/NatNetLib.dll.meta b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Plugins/x86/NatNetLib.dll.meta
deleted file mode 100644
index 6bd03e4e1..000000000
--- a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Plugins/x86/NatNetLib.dll.meta	
+++ /dev/null
@@ -1,52 +0,0 @@
-fileFormatVersion: 2
-guid: 86f370a71a6ec2a4da168a46e45eef86
-PluginImporter:
-  externalObjects: {}
-  serializedVersion: 2
-  iconMap: {}
-  executionOrder: {}
-  defineConstraints: []
-  isPreloaded: 0
-  isOverridable: 0
-  isExplicitlyReferenced: 0
-  validateReferences: 1
-  platformData:
-  - first:
-      Any: 
-    second:
-      enabled: 1
-      settings: {}
-  - first:
-      Editor: Editor
-    second:
-      enabled: 0
-      settings:
-        CPU: x86
-        DefaultValueInitialized: true
-  - first:
-      Standalone: Linux64
-    second:
-      enabled: 0
-      settings:
-        CPU: None
-  - first:
-      Standalone: OSXUniversal
-    second:
-      enabled: 0
-      settings:
-        CPU: x86
-  - first:
-      Standalone: Win
-    second:
-      enabled: 1
-      settings:
-        CPU: x86
-  - first:
-      Standalone: Win64
-    second:
-      enabled: 0
-      settings:
-        CPU: None
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
diff --git a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Plugins/x86_64/NatNetLib.dll b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Plugins/x86_64/NatNetLib.dll
deleted file mode 100644
index 7f77fd2b1..000000000
--- a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Plugins/x86_64/NatNetLib.dll	
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:d1c63719ccbf7c2010f64d3bdd6e54ca816de301baff85a658f0d9363728c829
-size 137216
diff --git a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Plugins/x86_64/NatNetLib.dll.meta b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Plugins/x86_64/NatNetLib.dll.meta
deleted file mode 100644
index 47f86b1cd..000000000
--- a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Plugins/x86_64/NatNetLib.dll.meta	
+++ /dev/null
@@ -1,2 +0,0 @@
-fileFormatVersion: 2
-guid: 90a37dc4ae5b35a45876059d687031bc
\ No newline at end of file
diff --git a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Prefabs/Client - OptiTrack.prefab b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Prefabs/Client - OptiTrack.prefab
index 63586374a..9dc81a0ad 100644
--- a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Prefabs/Client - OptiTrack.prefab	
+++ b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Prefabs/Client - OptiTrack.prefab	
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:8fc5f2f318752bfee1302d10448847f4d37cf312d296bf80929f91ace8b33d87
-size 1798
+oid sha256:4d28138cba0db2a44f9c41ad868dbfdea158c28bbc7b7460500b72c5f851bf05
+size 5115
diff --git a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/Editor/OptitrackStreamingClientEditor.cs b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/Editor/OptitrackStreamingClientEditor.cs
index ce0c5c5d6..8c05238e6 100644
--- a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/Editor/OptitrackStreamingClientEditor.cs	
+++ b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/Editor/OptitrackStreamingClientEditor.cs	
@@ -22,30 +22,25 @@ public class OptitrackStreamingClientEditor : Editor
         client = (OptitrackStreamingClient)target;
         var root = new VisualElement();
 
-        // Load stylesheets
         var commonUss = AssetDatabase.LoadAssetAtPath<StyleSheet>(CommonUssPath);
         if (commonUss != null) root.styleSheets.Add(commonUss);
 
         var uss = AssetDatabase.LoadAssetAtPath<StyleSheet>(UssPath);
         if (uss != null) root.styleSheets.Add(uss);
 
-        // Load UXML
         var uxml = AssetDatabase.LoadAssetAtPath<VisualTreeAsset>(UxmlPath);
         if (uxml != null) uxml.CloneTree(root);
 
-        // Cache references
         statusDot = root.Q("statusDot");
         statusText = root.Q<Label>("statusText");
         runtimeOffline = root.Q("runtimeOffline");
         runtimeOnline = root.Q("runtimeOnline");
         runtimeInfo = root.Q("runtimeInfo");
 
-        // Reconnect button
         var reconnectBtn = root.Q<Button>("reconnectBtn");
         if (reconnectBtn != null)
             reconnectBtn.clicked += () => { if (Application.isPlaying) client.Reconnect(); };
 
-        // Play mode polling
         root.schedule.Execute(UpdatePlayModeState).Every(300);
 
         return root;
@@ -57,7 +52,6 @@ public class OptitrackStreamingClientEditor : Editor
 
         bool isPlaying = Application.isPlaying;
 
-        // Toggle runtime sections
         if (isPlaying)
         {
             if (!runtimeOnline.ClassListContains("opti-runtime-online--visible"))
@@ -73,7 +67,6 @@ public class OptitrackStreamingClientEditor : Editor
                 runtimeOffline.RemoveFromClassList("opti-runtime-offline--hidden");
         }
 
-        // Update status badge
         if (isPlaying)
         {
             bool connected = client.IsConnected();
@@ -97,7 +90,6 @@ public class OptitrackStreamingClientEditor : Editor
     {
         if (statusDot == null || statusText == null) return;
 
-        // Clear all states
         statusDot.RemoveFromClassList("opti-status-dot--connected");
         statusDot.RemoveFromClassList("opti-status-dot--disconnected");
         statusText.RemoveFromClassList("opti-status-text--connected");
@@ -125,6 +117,8 @@ public class OptitrackStreamingClientEditor : Editor
             ? client.LocalAddress
             : client.ResolvedLocalAddress);
         AddInfoRow(runtimeInfo, "Connection Type", client.ConnectionType.ToString());
+        if (client.EnableReplayPriority)
+            AddInfoRow(runtimeInfo, "Replay / MMRP", client.ReplayServerAddress);
 
         if (!string.IsNullOrEmpty(client.ServerNatNetVersion))
             AddInfoRow(runtimeInfo, "Server NatNet", client.ServerNatNetVersion);
diff --git a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/Editor/UXML/OptitrackStreamingClientEditor.uxml b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/Editor/UXML/OptitrackStreamingClientEditor.uxml
index de656dfce..6eaf999ba 100644
--- a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/Editor/UXML/OptitrackStreamingClientEditor.uxml	
+++ b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/Editor/UXML/OptitrackStreamingClientEditor.uxml	
@@ -1,4 +1,4 @@
-<ui:UXML xmlns:ui="UnityEngine.UIElements" xmlns:uie="UnityEditor.UIElements">
+<ui:UXML xmlns:ui="UnityEngine.UIElements" xmlns:uie="UnityEditor.UIElements">
 
     <!-- Title Bar -->
     <ui:VisualElement name="titleBar" class="opti-title-bar">
@@ -12,11 +12,20 @@
     <!-- Connection Settings -->
     <ui:VisualElement class="section">
         <ui:Foldout text="Connection Settings" value="true" class="section-foldout">
-            <uie:PropertyField binding-path="ServerAddress" label="Server Address"/>
+            <uie:PropertyField binding-path="ServerAddress" label="Live Motive IP"/>
+            <uie:PropertyField binding-path="EnableReplayPriority" label="Use MMRP Replay Priority"/>
+            <uie:PropertyField binding-path="ReplayServerAddress" label="MMRP Replay IP"/>
+            <uie:PropertyField binding-path="DirectSyntheticSkeletonName" label="Fallback Actor Name"/>
             <uie:PropertyField binding-path="ConnectionType" label="Connection Type"/>
             <uie:PropertyField binding-path="SkeletonCoordinates" label="Skeleton Coordinates"/>
             <uie:PropertyField binding-path="TMarkersetCoordinates" label="TMarkerset Coordinates"/>
             <uie:PropertyField binding-path="BoneNamingConvention" label="Bone Naming Convention"/>
+            <ui:Foldout text="Advanced Endpoint Override" value="false" class="section-foldout">
+                <uie:PropertyField binding-path="CommandPort" label="Command Port"/>
+                <uie:PropertyField binding-path="DataPort" label="Data Port"/>
+                <uie:PropertyField binding-path="MulticastAddress" label="Multicast Address"/>
+                <uie:PropertyField binding-path="ReplayFreshnessSeconds" label="Replay Freshness Seconds"/>
+            </ui:Foldout>
         </ui:Foldout>
     </ui:VisualElement>
 
@@ -28,7 +37,7 @@
             <uie:PropertyField binding-path="DrawCameras" label="Draw Cameras"/>
             <uie:PropertyField binding-path="DrawForcePlates" label="Draw Force Plates"/>
             <uie:PropertyField binding-path="ReceiveDevices" label="Receive Devices"/>
-            <ui:HelpBox message-type="Info" text="iFacialMocap 등 analog device 데이터 수신. 매 프레임 sFrameOfMocapData 마샬링 발생(~200KB) — 페이셜 안 쓰면 OFF."/>
+            <ui:HelpBox message-type="Info" text="Receives analog device data such as iFacialMocap face streams. Turn this off if the scene does not use NatNet device data."/>
             <uie:PropertyField binding-path="RecordOnPlay" label="Record On Play"/>
             <uie:PropertyField binding-path="SkipDataDescriptions" label="Skip Data Descriptions"/>
             <uie:PropertyField binding-path="AutoReconnect" label="Auto Reconnect"/>
@@ -38,15 +47,15 @@
     <!-- Mirror Mode -->
     <ui:VisualElement class="section">
         <ui:Foldout text="Mirror Mode" value="true" class="section-foldout">
-            <uie:PropertyField binding-path="MirrorMode" label="Mirror Mode (좌우 반전)"/>
+            <uie:PropertyField binding-path="MirrorMode" label="Mirror Mode"/>
         </ui:Foldout>
     </ui:VisualElement>
 
     <!-- Skeleton Frame Filter -->
     <ui:VisualElement class="section">
         <ui:Foldout text="Skeleton Frame Filter" value="true" class="section-foldout">
-            <uie:PropertyField binding-path="EnableSkeletonFrameFilter" label="Enable Filter (엄격)"/>
-            <ui:HelpBox message-type="Info" text="ON: 본 하나라도 트래킹 실패/손상되면 그 프레임 전체를 폐기 → 떨림은 줄지만 라이브에서 마커 가림 시 액터가 얼어붙을 수 있음.&#10;OFF(권장·라이브): 정상 본만 갱신, 미트래킹·손상 본은 직전 포즈 유지 → 모션이 끊기지 않음."/>
+            <uie:PropertyField binding-path="EnableSkeletonFrameFilter" label="Enable Strict Skeleton Frame Filter"/>
+            <ui:HelpBox message-type="Info" text="ON: drop the whole skeleton frame if any bone is untracked or invalid. OFF is recommended for live use: valid bones update, invalid bones keep the last pose."/>
         </ui:Foldout>
     </ui:VisualElement>
 
@@ -62,7 +71,7 @@
     <ui:VisualElement name="runtimeSection" class="section">
         <ui:Foldout text="Runtime Controls" value="true" class="section-foldout">
             <ui:VisualElement name="runtimeOffline" class="opti-runtime-offline">
-                <ui:HelpBox message-type="Info" text="재접속 기능은 플레이 모드에서만 사용할 수 있습니다."/>
+                <ui:HelpBox message-type="Info" text="Runtime controls are available in Play Mode."/>
             </ui:VisualElement>
             <ui:VisualElement name="runtimeOnline" class="opti-runtime-online">
                 <ui:Button name="reconnectBtn" text="OptiTrack Reconnect" class="opti-reconnect-btn"/>
diff --git a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/OptitrackSkeletonAnimator_Mingle.cs b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/OptitrackSkeletonAnimator_Mingle.cs
index b7d0893b7..a707be120 100644
--- a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/OptitrackSkeletonAnimator_Mingle.cs	
+++ b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/OptitrackSkeletonAnimator_Mingle.cs	
@@ -49,6 +49,8 @@ public class OptitrackSkeletonAnimator_Mingle : MonoBehaviour
     private OptitrackSkeletonDefinition m_skeletonDef;
     private string previousSkeletonName;
 
+    private OptitrackStreamingClient m_boundStreamingClient;
+
     [HideInInspector]
     public bool isSkeletonFound = false;
 
@@ -261,15 +263,45 @@ public class OptitrackSkeletonAnimator_Mingle : MonoBehaviour
     {
         if (StreamingClient != null)
         {
-            StreamingClient.RegisterSkeleton(this, this.SkeletonAssetName);
-            previousSkeletonName = SkeletonAssetName;
+            RebindStreamingClient();
         }
 
-        // 코루틴이 이미 돌고 있지 않으면 시작
         if (m_checkCoroutine == null)
             m_checkCoroutine = StartCoroutine(CheckSkeletonConnectionPeriodically());
     }
 
+    public void SetStreamingClient(OptitrackStreamingClient client)
+    {
+        if (StreamingClient == client && m_boundStreamingClient == client)
+            return;
+        StreamingClient = client;
+        RebindStreamingClient();
+    }
+
+    private void RebindStreamingClient()
+    {
+        m_boundStreamingClient = StreamingClient;
+        m_skeletonDef = null;
+        m_boneIdToMappingIndex.Clear();
+        m_snapshotPositions.Clear();
+        m_snapshotOrientations.Clear();
+        ClearInterpolationBuffers();
+        m_hasLastFrameTimestamp = false;
+        isSkeletonFound = false;
+
+        if (StreamingClient == null)
+            return;
+
+        StreamingClient.RegisterSkeleton(this, SkeletonAssetName);
+        previousSkeletonName = SkeletonAssetName;
+        m_skeletonDef = StreamingClient.GetSkeletonDefinitionByName(SkeletonAssetName);
+        if (m_skeletonDef != null)
+        {
+            RebuildBoneIdMapping();
+            isSkeletonFound = true;
+        }
+    }
+
     private bool m_lastMirrorMode = false;
 
     void Update()
@@ -280,6 +312,12 @@ public class OptitrackSkeletonAnimator_Mingle : MonoBehaviour
             return;
         }
 
+        if (StreamingClient != m_boundStreamingClient)
+        {
+            RebindStreamingClient();
+            return;
+        }
+
         // MirrorMode 변경 감지 → 보간 상태 리셋 (불연속 튐 방지)
         bool currentMirrorMode = StreamingClient != null && StreamingClient.MirrorMode;
         if (currentMirrorMode != m_lastMirrorMode)
@@ -291,12 +329,7 @@ public class OptitrackSkeletonAnimator_Mingle : MonoBehaviour
         // 스켈레톤 이름 변경 감지
         if (previousSkeletonName != SkeletonAssetName)
         {
-            StreamingClient.RegisterSkeleton(this, SkeletonAssetName);
-            m_skeletonDef = StreamingClient.GetSkeletonDefinitionByName(SkeletonAssetName);
-            previousSkeletonName = SkeletonAssetName;
-            if (m_skeletonDef != null)
-                RebuildBoneIdMapping();
-            ClearInterpolationBuffers();
+            RebindStreamingClient();
             return;
         }
 
@@ -479,8 +512,7 @@ public class OptitrackSkeletonAnimator_Mingle : MonoBehaviour
         m_hipBoneId = -1;
         foreach (var bone in m_skeletonDef.Bones)
         {
-            string boneName = bone.Name;
-            string optiName = boneName.Contains("_") ? boneName.Substring(boneName.IndexOf('_') + 1) : boneName;
+            string optiName = ExtractOptiTrackBoneName(bone.Name, nameToIdx);
             if (nameToIdx.TryGetValue(optiName, out int idx))
             {
                 m_boneIdToMappingIndex[bone.Id] = idx;
@@ -492,6 +524,41 @@ public class OptitrackSkeletonAnimator_Mingle : MonoBehaviour
         Debug.Log($"[OptiTrack] 본 ID 매핑 완료: {matchCount}/{m_skeletonDef.Bones.Count} 매칭");
     }
 
+    private static string ExtractOptiTrackBoneName(string streamedBoneName, Dictionary<string, int> knownOptiNames)
+    {
+        if (string.IsNullOrEmpty(streamedBoneName))
+            return streamedBoneName;
+
+        if (knownOptiNames.ContainsKey(streamedBoneName))
+            return streamedBoneName;
+
+        int firstSep = streamedBoneName.IndexOf('_');
+        if (firstSep >= 0)
+        {
+            string afterFirst = streamedBoneName.Substring(firstSep + 1);
+            if (knownOptiNames.ContainsKey(afterFirst))
+                return afterFirst;
+
+            string beforeFirst = streamedBoneName.Substring(0, firstSep);
+            if (knownOptiNames.ContainsKey(beforeFirst))
+                return beforeFirst;
+        }
+
+        int lastSep = streamedBoneName.LastIndexOf('_');
+        if (lastSep > 0 && lastSep != firstSep)
+        {
+            string beforeLast = streamedBoneName.Substring(0, lastSep);
+            if (knownOptiNames.ContainsKey(beforeLast))
+                return beforeLast;
+
+            string afterLast = streamedBoneName.Substring(lastSep + 1);
+            if (knownOptiNames.ContainsKey(afterLast))
+                return afterLast;
+        }
+
+        return streamedBoneName;
+    }
+
     private void InitializeStreamingClient()
     {
         if (StreamingClient == null)
diff --git a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/OptitrackStreamingClient.cs b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/OptitrackStreamingClient.cs
index 7494971a2..01925a4da 100644
--- a/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/OptitrackStreamingClient.cs	
+++ b/Assets/External/OptiTrack Unity Plugin/OptiTrack/Scripts/OptitrackStreamingClient.cs	
@@ -1,5 +1,5 @@
 /* 
-Copyright © 2016 NaturalPoint Inc.
+Copyright 짤 2016 NaturalPoint Inc.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -19,12 +19,12 @@ using System.Collections.Generic;
 using System.Net;
 using System.Net.Sockets;
 using System.Runtime.InteropServices;
+using System.Text;
 using System.Threading;
 using UnityEngine;
 using NaturalPoint;
 using NaturalPoint.NatNetLib;
 
-
 /// <summary>Skeleton naming conventions supported by OptiTrack Motive.</summary>
 public enum OptitrackBoneNameConvention
 {
@@ -39,7 +39,6 @@ public enum StreamingCoordinatesValues
     Global
 }
 
-
 /// <summary>Describes the position and orientation of a streamed tracked object.</summary>
 public class OptitrackPose
 {
@@ -47,8 +46,6 @@ public class OptitrackPose
     public Quaternion Orientation;
 }
 
-
-
 /// <summary>Represents the state of a streamed marker.</summary>
 public class OptitrackMarkerState
 {
@@ -60,7 +57,6 @@ public class OptitrackMarkerState
     public bool IsActive;
 }
 
-
 /// <summary>Represents the state of a streamed rigid body at an instant in time.</summary>
 public class OptitrackRigidBodyState
 {
@@ -69,14 +65,13 @@ public class OptitrackRigidBodyState
     public bool IsTracked;
 }
 
-
 /// <summary>Represents the state of a streamed skeleton at an instant in time.</summary>
 public class OptitrackSkeletonState
 {
     /// <summary>Maps from OptiTrack bone IDs to their corresponding bone poses.</summary>
     public Dictionary<Int32, OptitrackPose> BonePoses;
     public Dictionary<Int32, OptitrackPose> LocalBonePoses;
-    /// <summary>NatNet 프레임이 수신된 시각 (고해상도 하드웨어 타이머 기반).</summary>
+    /// <summary>NatNet ?꾨젅?꾩씠 ?섏떊???쒓컖 (怨좏빐?곷룄 ?섎뱶?⑥뼱 ?€?대㉧ 湲곕컲).</summary>
     public OptitrackHiResTimer.Timestamp DeliveryTimestamp;
 }
 
@@ -88,7 +83,6 @@ public class OptitrackTMarkersetState // trained markerset added
     public Dictionary<Int32, OptitrackPose> LocalBonePoses;
 }
 
-
 public class OptitrackRigidBodyDefinition
 {
     public class MarkerDefinition
@@ -136,7 +130,6 @@ public class OptitrackSkeletonDefinition
     public Dictionary<Int32, Int32> BoneIdToParentIdMap;
 }
 
-
 public class OptitrackTMarkersetDefinition // trained markerset added // check where this is coming from
 {
     public class BoneDefinition
@@ -184,7 +177,6 @@ public class OptitrackTMarkersetDefinition // trained markerset added // check w
     public List<MarkerDefinition> Markers;
 }
 
-
 public class OptitrackMarkersDefinition
 {
     /// <summary>The name of this bone.</summary>
@@ -227,7 +219,6 @@ public class OptitrackForcePlateDefinition
     public List<string> ChannelNames;
 }
 
-
 public class OptitrackCameraDefinition
 {
     /// <summary>The name of this camera.</summary>
@@ -240,7 +231,6 @@ public class OptitrackCameraDefinition
     public Quaternion Orientation;
 }
 
-
 /// <summary>Definition of a generic analog device (e.g. iFacialMocap face stream).</summary>
 public class OptitrackDeviceDefinition
 {
@@ -253,7 +243,6 @@ public class OptitrackDeviceDefinition
     public List<string> ChannelNames;
 }
 
-
 /// <summary>Latest sampled frame for a generic analog device.</summary>
 public class OptitrackDeviceState
 {
@@ -265,7 +254,6 @@ public class OptitrackDeviceState
     public OptitrackHiResTimer.Timestamp DeliveryTimestamp;
 }
 
-
 public static class OptitrackHiResTimer
 {
     public struct Timestamp
@@ -295,12 +283,15 @@ public static class OptitrackHiResTimer
     }
 }
 
-
 /// <summary>
 /// Connects to a NatNet streaming server and makes the data available in lightweight Unity-friendly representations.
 /// </summary>
 public class OptitrackStreamingClient : MonoBehaviour
 {
+    private const int k_DefaultNatNetCommandPort = 1510;
+    private const int k_DefaultNatNetDataPort = 1511;
+    private const int k_MaxNatNetDevices = 32;
+
     public enum ClientConnectionType
     {
         Multicast,
@@ -327,6 +318,32 @@ public class OptitrackStreamingClient : MonoBehaviour
     [Tooltip("Unicast performs subscription reducing your overall data set in some applications.")]
     public ClientConnectionType ConnectionType;
 
+    [Header("NatNet Endpoint Override")]
+    [Tooltip("NatNet command port. Motive/MMRP default = 1510.")]
+    [Range(1, 65535)]
+    public int CommandPort = k_DefaultNatNetCommandPort;
+
+    [Tooltip("NatNet data port. Motive/MMRP default = 1511.")]
+    [Range(1, 65535)]
+    public int DataPort = k_DefaultNatNetDataPort;
+
+    [Tooltip("Optional multicast group override. Empty uses the NatNet default group (usually 239.255.42.99). Use a separate group for replay, e.g. 239.255.42.100.")]
+    public string MulticastAddress = "";
+
+    [Header("Replay Priority Quick Setup")]
+    [Tooltip("Enable Live Motive + MMRP Replay priority switching from this Streaming Client inspector.")]
+    public bool EnableReplayPriority = false;
+
+    [Tooltip("MMRP / recording PC IP address. Replay frames from this IP override live frames while fresh.")]
+    public string ReplayServerAddress = "127.0.0.1";
+
+    [Tooltip("Replay frames are preferred while newer than this many seconds.")]
+    [Range(0.05f, 5.0f)]
+    public float ReplayFreshnessSeconds = 0.35f;
+
+    [Tooltip("Actor/skeleton name to use when the NatNet command channel is unavailable and names cannot be read from MODELDEF. Must match OptitrackSkeletonAnimator_Mingle.SkeletonAssetName.")]
+    public string DirectSyntheticSkeletonName = "002";
+
     [Tooltip("Controls whether skeleton data is streamed with local or global coordinates.")]
     public StreamingCoordinatesValues SkeletonCoordinates = StreamingCoordinatesValues.Local;
 
@@ -355,11 +372,11 @@ public class OptitrackStreamingClient : MonoBehaviour
 
     [Tooltip("Motive will record when the Unity project is played.")]
     public bool RecordOnPlay = false;
-    
+
     [Tooltip("Skips getting data descriptions. Skeletons will not work with this feature turned on, but it will reduce network usage with a large number of rigid bodies.")]
     public bool SkipDataDescriptions = false;
 
-    [Tooltip("초기 연결 실패 시 최대 10회 백오프 재시도, 스트리밍이 끊어졌을 때도 최대 5회까지 자동으로 재연결을 시도합니다.")]
+    [Tooltip("Automatically retries the initial connection and reconnects when streaming frames stop.")]
     public bool AutoReconnect = true;
 
     [Tooltip("Changes to the version of Natnet used by the server")]
@@ -370,16 +387,13 @@ public class OptitrackStreamingClient : MonoBehaviour
     //public bool TimecodeProvider = false;
 
     [Header("Mirror Mode")]
-    [Tooltip("모든 스켈레톤 본과 리지드바디의 좌우를 거울 반전합니다.")]
+    [Tooltip("Mirrors streamed skeleton bones and retargeted avatar motion left/right.")]
     public bool MirrorMode = false;
 
     [Header("Skeleton Frame Filter")]
-    [Tooltip("스켈레톤 프레임 무결성 필터입니다.\n" +
-        "ON: 본 하나라도 트래킹 실패·손상되면 그 프레임 전체를 폐기해 떨림/순간 깨짐을 막습니다. 대신 라이브에서 마커 가림이 잦으면 액터가 얼어붙을 수 있습니다.\n" +
-        "OFF(권장·라이브): 정상 본만 갱신하고 미트래킹·손상 본은 직전 포즈를 유지해 모션이 끊기지 않습니다. (NaN/0-쿼터니언 본은 모드와 무관하게 개별로 건너뜁니다.)")]
+    [Tooltip("Strict skeleton frame filter.\nON: drops the whole skeleton frame when any bone is untracked or invalid.\nOFF: valid bones update and invalid bones keep the previous pose. Recommended for live use.")]
     public bool EnableSkeletonFrameFilter = false;
 
-
     #region Private fields
     //private UInt16 ServerCommandPort = NatNetConstants.DefaultCommandPort;
     //private UInt16 ServerDataPort = NatNetConstants.DefaultDataPort;
@@ -389,13 +403,29 @@ public class OptitrackStreamingClient : MonoBehaviour
     private bool m_hasDrawnCameras = false;
     private bool m_hasDrawnForcePlates = false;
     private bool m_subscribedToMarkers = false;
-    private float m_markerSubscribeRetryCooldown = 0f; // 마커 구독 실패 시 재시도 쿨다운
-    private const float k_MarkerSubscribeRetryInterval = 10f; // 10초 간격 재시도
+    private float m_markerSubscribeRetryCooldown = 0f; // 留덉빱 援щ룆 ?ㅽ뙣 ???ъ떆??荑⑤떎??
+    private const float k_MarkerSubscribeRetryInterval = 10f; // 10珥?媛꾧꺽 ?ъ떆??
 
     private OptitrackHiResTimer.Timestamp m_lastFrameDeliveryTimestamp;
     private Coroutine m_connectionHealthCoroutine = null;
+    private Coroutine m_replayConnectCoroutine = null;
+    private UdpClient m_directFrameUdp = null;
+    private Thread m_directFrameThread = null;
+    private volatile bool m_directFrameRunning = false;
+    private bool m_directFrameLogged = false;
+    private volatile bool m_directFrameLogPending = false;
+    private volatile bool m_directTimeoutLogPending = false;
+    private volatile bool m_directSocketErrorLogPending = false;
+    private string m_directSocketErrorMessage = "";
+    private int m_directTimeoutCount = 0;
+    private bool m_directNatNetConnected = false;
+    private bool m_directNoModelDefWarned = false;
 
     private NatNetClient m_client;
+    private NatNetClient m_replayClient;
+    private bool m_replayReceivedFrameSinceConnect = false;
+    private bool m_replayConnectWarned = false;
+    private OptitrackHiResTimer.Timestamp m_lastReplayFrameDeliveryTimestamp;
     private NatNetClient.DataDescriptions m_dataDescs;
     private List<OptitrackRigidBodyDefinition> m_rigidBodyDefinitions = new List<OptitrackRigidBodyDefinition>();
     private List<OptitrackSkeletonDefinition> m_skeletonDefinitions = new List<OptitrackSkeletonDefinition>();
@@ -420,7 +450,7 @@ public class OptitrackStreamingClient : MonoBehaviour
     /// <summary>Reusable staging buffers used to validate a complete skeleton frame before committing it.</summary>
     private Dictionary<Int32, sRigidBodyData[]> m_skeletonFrameScratch = new Dictionary<Int32, sRigidBodyData[]>();
 
-    /// <summary>MirrorMode용: 스켈레톤 ID → (boneId → mirrorBoneId) 매핑 캐시.</summary>
+    /// <summary>MirrorMode?? ?ㅼ펷?덊넠 ID ??(boneId ??mirrorBoneId) 留ㅽ븨 罹먯떆.</summary>
     private Dictionary<Int32, Dictionary<Int32, Int32>> m_mirrorBoneIdMaps = new Dictionary<Int32, Dictionary<Int32, Int32>>();
 
     /// <summary>Maps from a streamed trained markerset's ID to its most recent available pose data.</summary>
@@ -453,43 +483,66 @@ public class OptitrackStreamingClient : MonoBehaviour
     /// </summary>
     private object m_frameDataUpdateLock = new object();
 
-    /// <summary>assetID → assetName 캐시 (GetMarkerName 내 3중 선형 탐색 제거용).</summary>
+    /// <summary>assetID ??assetName 罹먯떆 (GetMarkerName ??3以??좏삎 ?먯깋 ?쒓굅??.</summary>
     private Dictionary<Int32, string> m_assetIdToNameCache = new Dictionary<Int32, string>();
 
-    // 중간에 새 스켈레톤이 생성된 경우 정의 재조회 플래그 (NatNet 스레드에서도 씀 → volatile)
+    // 以묎컙?????ㅼ펷?덊넠???앹꽦??寃쎌슦 ?뺤쓽 ?ъ“???뚮옒洹?(NatNet ?ㅻ젅?쒖뿉?쒕룄 ?€ ??volatile)
     private volatile bool m_pendingDefinitionRefresh = false;
     private float m_definitionRefreshCooldown = 0f;
 
-    // 자동 재연결 진행 중 여부 (중복 재연결 방지)
+    // ?먮룞 ?ъ뿰寃?吏꾪뻾 以??щ? (以묐났 ?ъ뿰寃?諛⑹?)
     private bool m_isReconnecting = false;
 
-    // 녹화 상태 추적 (ToggleRecording에서 불필요한 이중 명령 방지)
+    // ?뱁솕 ?곹깭 異붿쟻 (ToggleRecording?먯꽌 遺덊븘?뷀븳 ?댁쨷 紐낅졊 諛⑹?)
     private bool m_isRecording = false;
 
-    // SetProperty 원격 명령을 최초 연결에서만 전송 (재연결 시 Motive 설정 반복 변경 방지)
+    // SetProperty ?먭꺽 紐낅졊??理쒖큹 ?곌껐?먯꽌留??꾩넚 (?ъ뿰寃???Motive ?ㅼ젙 諛섎났 蹂€寃?諛⑹?)
     private bool m_hasAppliedServerSettings = false;
 
-    // 정의 재조회 횟수 제한 (Motive 부하 방지: 최대 횟수 초과 시 수동 트리거 필요)
+    // ?뺤쓽 ?ъ“???잛닔 ?쒗븳 (Motive 遺€??諛⑹?: 理쒕? ?잛닔 珥덇낵 ???섎룞 ?몃━嫄??꾩슂)
     private int m_definitionRefreshCount = 0;
     private const int k_MaxAutoDefinitionRefreshes = 10;
     #endregion Private fields
 
-
     /// <summary>
-    /// 외부에서 정의 재조회를 요청합니다. 쿨다운(5초) 내에는 무시됩니다.
-    /// OptitrackRigidBody, OptitrackSkeletonAnimator_Mingle 등에서 에셋을 찾지 못할 때 호출.
+    /// ?몃??먯꽌 ?뺤쓽 ?ъ“?뚮? ?붿껌?⑸땲?? 荑⑤떎??5珥? ?댁뿉??臾댁떆?⑸땲??
+    /// OptitrackRigidBody, OptitrackSkeletonAnimator_Mingle ?깆뿉???먯뀑??李얠? 紐삵븷 ???몄텧.
     /// </summary>
     public void RequestDefinitionRefresh()
     {
         m_pendingDefinitionRefresh = true;
     }
 
-
     private void Update()
     {
+        if (m_directFrameLogPending)
+        {
+            m_directFrameLogPending = false;
+            Debug.Log(GetType().FullName + ": receiving NatNet frames through direct UDP fallback.", this);
+        }
+        if (m_directTimeoutLogPending)
+        {
+            m_directTimeoutLogPending = false;
+            Debug.LogWarning(GetType().FullName + ": direct NatNet receiver is joined but has not received multicast packets yet. If Python receives frames on this PC, check Unity Editor firewall permission or disable the separate NatNetDeviceListener objects for this test.", this);
+        }
+        if (m_directSocketErrorLogPending)
+        {
+            m_directSocketErrorLogPending = false;
+            Debug.LogWarning(GetType().FullName + ": direct NatNet receiver socket warning: " + m_directSocketErrorMessage, this);
+        }
+
+        if (EnableReplayPriority && m_replayConnectCoroutine == null && ConnectionType != ClientConnectionType.Multicast)
+            m_replayConnectCoroutine = StartCoroutine(ReplayConnectLoop());
+        else if (!EnableReplayPriority && m_replayConnectCoroutine != null)
+        {
+            StopCoroutine(m_replayConnectCoroutine);
+            m_replayConnectCoroutine = null;
+            CleanupReplayClient();
+        }
+
         if (DrawMarkers)
         {
-            // 마커 구독 실패 시 매 프레임 재시도 방지 — 쿨다운 적용
+            // 留덉빱 援щ룆 ?ㅽ뙣 ??留??꾨젅???ъ떆??諛⑹? ??荑⑤떎???곸슜
             if (m_client != null && ConnectionType == ClientConnectionType.Unicast && !m_subscribedToMarkers)
             {
                 if (m_markerSubscribeRetryCooldown <= 0f)
@@ -504,7 +557,7 @@ public class OptitrackStreamingClient : MonoBehaviour
                 }
             }
 
-            // 락 범위 최소화: 데이터만 복사 → 락 해제 후 GameObject 생성/파괴
+            // ??踰붿쐞 理쒖냼?? ?곗씠?곕쭔 蹂듭궗 ?????댁젣 ??GameObject ?앹꽦/?뚭눼
             var markerSnapshot = new Dictionary<Int32, (Vector3 pos, float size, string name, bool isActive)>();
             lock (m_frameDataUpdateLock)
             {
@@ -519,7 +572,7 @@ public class OptitrackStreamingClient : MonoBehaviour
                 }
             }
 
-            // 락 밖에서 GameObject 업데이트/생성
+            // ??諛뽰뿉??GameObject ?낅뜲?댄듃/?앹꽦
             var activeIds = new HashSet<Int32>(markerSnapshot.Count);
             foreach (var kvp in markerSnapshot)
             {
@@ -540,7 +593,7 @@ public class OptitrackStreamingClient : MonoBehaviour
                     m_latestMarkerSpheres[kvp.Key] = sphere;
                 }
             }
-            // 락 밖에서 stale 오브젝트 제거
+            // ??諛뽰뿉??stale ?ㅻ툕?앺듃 ?쒓굅
             var staleIds = new List<Int32>();
             foreach (var sphereEntry in m_latestMarkerSpheres)
             {
@@ -563,13 +616,12 @@ public class OptitrackStreamingClient : MonoBehaviour
             m_latestMarkerSpheres.Clear();
         }
 
-
-        // 락 밖에서 카메라 지오메트리 생성 (1회성 — 데이터는 m_cameraDefinitions에 이미 복사됨)
+        // ??諛뽰뿉??移대찓??吏€?ㅻ찓?몃━ ?앹꽦 (1?뚯꽦 ???곗씠?곕뒗 m_cameraDefinitions???대? 蹂듭궗??
         if (DrawCameras && !m_hasDrawnCameras )
         {
             if (m_client.ServerAppVersion >= new Version(3, 0, 0))
             {
-                // m_cameraDefinitions는 메인 스레드의 UpdateDefinitions()에서 채워짐 — 락 불필요
+                // m_cameraDefinitions??硫붿씤 ?ㅻ젅?쒖쓽 UpdateDefinitions()?먯꽌 梨꾩썙吏?????遺덊븘??
                 var cameraGroup = new GameObject("Cameras");
                 foreach (OptitrackCameraDefinition camera in m_cameraDefinitions)
                 {
@@ -590,7 +642,7 @@ public class OptitrackStreamingClient : MonoBehaviour
             m_hasDrawnCameras = true;
         }
 
-        // 락 밖에서 포스 플레이트 지오메트리 생성 (1회성)
+        // ??諛뽰뿉???ъ뒪 ?뚮젅?댄듃 吏€?ㅻ찓?몃━ ?앹꽦 (1?뚯꽦)
         if (DrawForcePlates && !m_hasDrawnForcePlates)
         {
             var forcePlateGroup = new GameObject("Force Plates");
@@ -622,7 +674,7 @@ public class OptitrackStreamingClient : MonoBehaviour
         // Trained Markerset Markers if requested to draw // trained markerset added
         if (DrawTMarkersetMarkers)
         {
-            // 락 범위 최소화: 데이터만 복사 → 락 해제 후 GameObject 생성/파괴
+            // ??踰붿쐞 理쒖냼?? ?곗씠?곕쭔 蹂듭궗 ?????댁젣 ??GameObject ?앹꽦/?뚭눼
             var tmarkSnapshot = new Dictionary<Int32, (Vector3 pos, float size, string name, bool isActive)>();
             lock (m_frameDataUpdateLock)
             {
@@ -637,7 +689,7 @@ public class OptitrackStreamingClient : MonoBehaviour
                 }
             }
 
-            // 락 밖에서 GameObject 업데이트/생성
+            // ??諛뽰뿉??GameObject ?낅뜲?댄듃/?앹꽦
             var activeTMarkIds = new HashSet<Int32>(tmarkSnapshot.Count);
             foreach (var kvp in tmarkSnapshot)
             {
@@ -658,7 +710,7 @@ public class OptitrackStreamingClient : MonoBehaviour
                     m_latestTMarkMarkerSpheres[kvp.Key] = cube;
                 }
             }
-            // 락 밖에서 stale 오브젝트 제거
+            // ??諛뽰뿉??stale ?ㅻ툕?앺듃 ?쒓굅
             var staleTMarkIds = new List<Int32>();
             foreach (var cubeEntry in m_latestTMarkMarkerSpheres)
             {
@@ -681,8 +733,8 @@ public class OptitrackStreamingClient : MonoBehaviour
             m_latestTMarkMarkerSpheres.Clear();
         }
 
-        // 미등록 스켈레톤이 프레임에 등장했을 때 정의 자동 재조회 (Motive 중간 생성 대응)
-        // 쿨다운 15초 + 최대 횟수 제한으로 Motive DataDescription 요청 폭풍 방지
+        // 誘몃벑濡??ㅼ펷?덊넠???꾨젅?꾩뿉 ?깆옣?덉쓣 ???뺤쓽 ?먮룞 ?ъ“??(Motive 以묎컙 ?앹꽦 ?€??
+        // 荑⑤떎??15珥?+ 理쒕? ?잛닔 ?쒗븳?쇰줈 Motive DataDescription ?붿껌 ??뭾 諛⑹?
         if (m_pendingDefinitionRefresh && m_definitionRefreshCooldown <= 0f && m_client != null && !SkipDataDescriptions)
         {
             m_pendingDefinitionRefresh = false;
@@ -696,16 +748,15 @@ public class OptitrackStreamingClient : MonoBehaviour
             }
             else
             {
-                // 최대 횟수 초과 — 경고 로그 출력 후 자동 재조회 중단
-                m_definitionRefreshCooldown = 60f; // 1분 후 다시 시도 허용
-                Debug.LogWarning(GetType().FullName + ": 자동 정의 재조회 최대 횟수(" + k_MaxAutoDefinitionRefreshes + "회) 초과. Motive에서 에셋을 확인하세요.", this);
+                // 理쒕? ?잛닔 珥덇낵 ??寃쎄퀬 濡쒓렇 異쒕젰 ???먮룞 ?ъ“??以묐떒
+                m_definitionRefreshCooldown = 60f; // 1遺????ㅼ떆 ?쒕룄 ?덉슜
+                Debug.LogWarning(GetType().FullName + ": Automatic definition refresh limit reached (" + k_MaxAutoDefinitionRefreshes + "). Check the streamed assets in Motive.", this);
             }
         }
         if (m_definitionRefreshCooldown > 0f)
             m_definitionRefreshCooldown -= Time.deltaTime;
     }
 
-
     /// <summary>
     /// Returns the first <see cref="OptitrackStreamingClient"/> component located in the scene.
     /// Provides a convenient, sensible default in the common case where only a single client exists.
@@ -766,13 +817,13 @@ public class OptitrackStreamingClient : MonoBehaviour
     {
         if (m_isReconnecting)
         {
-            Debug.LogWarning(GetType().FullName + ": 재연결이 이미 진행 중입니다.", this);
+            Debug.LogWarning(GetType().FullName + ": Reconnect is already in progress.", this);
             return;
         }
 
-        Debug.Log("OptiTrack: 재접속을 시도합니다...");
+        Debug.Log("OptiTrack: reconnect requested.");
 
-        // 기존 연결 정리 (StopAllCoroutines 포함)
+        // 湲곗〈 ?곌껐 ?뺣━ (StopAllCoroutines ?ы븿)
         OnDisable();
 
         StartCoroutine(ReconnectCoroutine());
@@ -792,46 +843,40 @@ public class OptitrackStreamingClient : MonoBehaviour
         {
             m_receivedFrameSinceConnect = false;
             float delay = (attempt == 1) ? 1.0f : 5.0f;
-            Debug.Log(string.Format("{0}: 재연결 시도 {1}/{2} — {3}초 후...", GetType().FullName, attempt, maxAttempts, delay), this);
+            Debug.Log(string.Format("{0}: reconnect attempt {1}/{2} in {3} seconds...", GetType().FullName, attempt, maxAttempts, delay), this);
             yield return new WaitForSeconds(delay);
 
-            // ConnectCoroutine 실행: 연결 수립 + CheckConnectionHealth 시작
+            // ConnectCoroutine ?ㅽ뻾: ?곌껐 ?섎┰ + CheckConnectionHealth ?쒖옉
             yield return StartCoroutine(ConnectCoroutine());
 
-            // 첫 프레임 수신까지 최대 3초 대기
+            // 泥??꾨젅???섏떊源뚯? 理쒕? 3珥??€湲?
             float deadline = Time.realtimeSinceStartup + 3.0f;
             while (!m_receivedFrameSinceConnect && Time.realtimeSinceStartup < deadline)
                 yield return null;
 
             if (m_receivedFrameSinceConnect)
             {
-                Debug.Log(GetType().FullName + ": 재연결 성공.", this);
-                // 재연결 성공 후에만 녹화 재시작
+                Debug.Log(GetType().FullName + ": reconnect succeeded.", this);
+                // ?ъ뿰寃??깃났 ?꾩뿉留??뱁솕 ?ъ떆??
                 if (RecordOnPlay)
                     StartRecording();
                 m_isReconnecting = false;
                 yield break;
             }
 
-            Debug.LogWarning(string.Format("{0}: 재연결 시도 {1}/{2} 실패 — 데이터 수신 없음.", GetType().FullName, attempt, maxAttempts), this);
+            Debug.LogWarning(string.Format("{0}: reconnect attempt {1}/{2} failed; no streaming frames received.", GetType().FullName, attempt, maxAttempts), this);
 
-            // 다음 시도 전 부분 연결 정리 (ReconnectCoroutine 자신은 중지하지 않도록 StopCoroutine 사용)
+            // ?ㅼ쓬 ?쒕룄 ??遺€遺??곌껐 ?뺣━ (ReconnectCoroutine ?먯떊?€ 以묒??섏? ?딅룄濡?StopCoroutine ?ъ슜)
             if (m_connectionHealthCoroutine != null)
             {
                 StopCoroutine(m_connectionHealthCoroutine);
                 m_connectionHealthCoroutine = null;
             }
-            if (m_client != null)
-            {
-                // 재연결 루프 중에는 녹화 중지 명령 생략 — Motive 디스크 I/O 반복 방지
-                try { m_client.NativeFrameReceived -= OnNatNetFrameReceived; } catch (System.Exception) { }
-                try { m_client.Disconnect(); } catch (System.Exception) { }
-                try { m_client.Dispose(); } catch (System.Exception) { }
-                m_client = null;
-            }
+            if (m_client != null || m_directNatNetConnected)
+                CleanupClient();
         }
 
-        Debug.LogError(string.Format("{0}: {1}회 재연결 시도 모두 실패. 수동으로 재연결하십시오.", GetType().FullName, maxAttempts), this);
+        Debug.LogError(string.Format("{0}: all {1} reconnect attempts failed. Reconnect manually from the Inspector.", GetType().FullName, maxAttempts), this);
         m_isReconnecting = false;
     }
 
@@ -841,7 +886,7 @@ public class OptitrackStreamingClient : MonoBehaviour
     /// <returns>True if connected and receiving data, false otherwise.</returns>
     public bool IsConnected()
     {
-        return m_client != null && m_receivedFrameSinceConnect;
+        return ((m_client != null || m_directNatNetConnected) && m_receivedFrameSinceConnect) || IsReplayFrameFresh();
     }
 
     /// <summary>
@@ -850,24 +895,29 @@ public class OptitrackStreamingClient : MonoBehaviour
     /// <returns>Connection status description.</returns>
     public string GetConnectionStatus()
     {
-        if (m_client == null)
+        if (IsReplayFrameFresh())
         {
-            return "연결 안됨";
+            return "Replay active (MMRP)";
+        }
+
+        if (m_client == null && !m_directNatNetConnected)
+        {
+            return "Disconnected";
         }
         else if (!m_receivedFrameSinceConnect)
         {
-            return "연결됨 (데이터 대기 중)";
+            return "Connected, waiting for data";
         }
         else
         {
             float lastFrameAge = m_lastFrameDeliveryTimestamp.AgeSeconds;
             if (lastFrameAge < 5.0f)
             {
-                return "연결됨 (데이터 수신 중)";
+                return "Connected, receiving data";
             }
             else
             {
-                return "연결됨 (데이터 중단됨)";
+                return "Connected, data interrupted";
             }
         }
     }
@@ -881,11 +931,11 @@ public class OptitrackStreamingClient : MonoBehaviour
         bool result = StartRecording();
         if (result)
         {
-            Debug.Log("OptiTrack: 레코딩을 시작했습니다.");
+            Debug.Log("OptiTrack: recording started.");
         }
         else
         {
-            Debug.LogWarning("OptiTrack: 레코딩 시작에 실패했습니다.");
+            Debug.LogWarning("OptiTrack: failed to start recording.");
         }
     }
 
@@ -897,11 +947,11 @@ public class OptitrackStreamingClient : MonoBehaviour
         bool result = StopRecording();
         if (result)
         {
-            Debug.Log("OptiTrack: 레코딩을 중지했습니다.");
+            Debug.Log("OptiTrack: recording stopped.");
         }
         else
         {
-            Debug.LogWarning("OptiTrack: 레코딩 중지에 실패했습니다.");
+            Debug.LogWarning("OptiTrack: failed to stop recording.");
         }
     }
 
@@ -912,25 +962,25 @@ public class OptitrackStreamingClient : MonoBehaviour
     {
         if (m_client != null)
         {
-            // 상태 추적 기반 토글 — 기존: "일단 Start → 실패하면 Stop" 이중 명령 → 1회 명령으로 개선
+            // ?곹깭 異붿쟻 湲곕컲 ?좉? ??湲곗〈: "?쇰떒 Start ???ㅽ뙣?섎㈃ Stop" ?댁쨷 紐낅졊 ??1??紐낅졊?쇰줈 媛쒖꽑
             if (m_isRecording)
             {
                 if (StopRecording())
-                    Debug.Log("OptiTrack: 레코딩을 중지했습니다.");
+                    Debug.Log("OptiTrack: recording stopped.");
                 else
-                    Debug.LogWarning("OptiTrack: 레코딩 중지에 실패했습니다.");
+                    Debug.LogWarning("OptiTrack: failed to stop recording.");
             }
             else
             {
                 if (StartRecording())
-                    Debug.Log("OptiTrack: 레코딩을 시작했습니다.");
+                    Debug.Log("OptiTrack: recording started.");
                 else
-                    Debug.LogWarning("OptiTrack: 레코딩 시작에 실패했습니다.");
+                    Debug.LogWarning("OptiTrack: failed to start recording.");
             }
         }
         else
         {
-            Debug.LogError("OptiTrack: 클라이언트가 연결되지 않았습니다.");
+            Debug.LogError("OptiTrack: client is not connected.");
         }
     }
 
@@ -941,7 +991,6 @@ public class OptitrackStreamingClient : MonoBehaviour
     }
     #endregion
 
-
     /// <summary>Get the most recently received state for the specified rigid body.</summary>
     /// <param name="rigidBodyId">Corresponds to the "User ID" field in Motive.</param>
     /// <returns>The most recent available state, or null if none available.</returns>
@@ -982,7 +1031,6 @@ public class OptitrackStreamingClient : MonoBehaviour
         return rbState;
     }
 
-
     /// <summary>Get the most recently received state for the specified skeleton.</summary>
     /// <param name="skeletonId">
     /// Taken from the corresponding <see cref="OptitrackSkeletonDefinition.Id"/> field.
@@ -1002,10 +1050,10 @@ public class OptitrackStreamingClient : MonoBehaviour
     }
 
     /// <summary>
-    /// 락을 유지한 채로 스켈레톤 포즈를 pre-allocated 딕셔너리에 복사.
-    /// GetLatestSkeletonState() 후 락 없이 BonePoses를 순회하는 torn read를 방지.
+    /// ?쎌쓣 ?좎???梨꾨줈 ?ㅼ펷?덊넠 ?ъ쫰瑜?pre-allocated ?뺤뀛?덈━??蹂듭궗.
+    /// GetLatestSkeletonState() ?????놁씠 BonePoses瑜??쒗쉶?섎뒗 torn read瑜?諛⑹?.
     /// </summary>
-    /// <returns>스켈레톤 데이터가 존재하면 true, 없으면 false.</returns>
+    /// <returns>?ㅼ펷?덊넠 ?곗씠?곌? 議댁옱?섎㈃ true, ?놁쑝硫?false.</returns>
     public bool FillBoneSnapshot( Int32 skeletonId,
         Dictionary<Int32, Vector3> posOut,
         Dictionary<Int32, Quaternion> oriOut,
@@ -1031,13 +1079,13 @@ public class OptitrackStreamingClient : MonoBehaviour
 
                     if ( targetId == kvp.Key )
                     {
-                        // 대칭 본 (Hip, 척추, 목, 머리 등): YZ 평면 반사 적용
+                        // ?€移?蹂?(Hip, 泥숈텛, 紐? 癒몃━ ??: YZ ?됰㈃ 諛섏궗 ?곸슜
                         posOut[kvp.Key] = MirrorPosition( kvp.Value.Position );
                         oriOut[kvp.Key] = MirrorOrientation( kvp.Value.Orientation );
                     }
                     else
                     {
-                        // L/R 쌍 본: 위치는 자기 자리 유지, 회전은 YZ 반사 후 미러 본으로 스왑
+                        // L/R ??蹂? ?꾩튂???먭린 ?먮━ ?좎?, ?뚯쟾?€ YZ 諛섏궗 ??誘몃윭 蹂몄쑝濡??ㅼ솑
                         posOut[kvp.Key]  = kvp.Value.Position;
                         oriOut[targetId] = MirrorOrientation( kvp.Value.Orientation );
                     }
@@ -1056,8 +1104,8 @@ public class OptitrackStreamingClient : MonoBehaviour
     }
 
     /// <summary>
-    /// 본 이름의 L/R 접두사를 반전한 이름을 반환. 대칭 본이면 null.
-    /// 예: "LUArm" → "RUArm", "RShin" → "LShin", "Hip" → null
+    /// 蹂??대쫫??L/R ?묐몢?щ? 諛섏쟾???대쫫??諛섑솚. ?€移?蹂몄씠硫?null.
+    /// ?? "LUArm" ??"RUArm", "RShin" ??"LShin", "Hip" ??null
     /// </summary>
     private static string GetMirrorBoneName( string name )
     {
@@ -1068,8 +1116,8 @@ public class OptitrackStreamingClient : MonoBehaviour
     }
 
     /// <summary>
-    /// 스켈레톤 정의를 기반으로 boneId → mirrorBoneId 매핑을 빌드하고 캐시에 저장.
-    /// m_frameDataUpdateLock 내에서 호출해야 함.
+    /// ?ㅼ펷?덊넠 ?뺤쓽瑜?湲곕컲?쇰줈 boneId ??mirrorBoneId 留ㅽ븨??鍮뚮뱶?섍퀬 罹먯떆???€??
+    /// m_frameDataUpdateLock ?댁뿉???몄텧?댁빞 ??
     /// </summary>
     private Dictionary<Int32, Int32> GetOrBuildMirrorBoneIdMap( Int32 skeletonId )
     {
@@ -1079,7 +1127,7 @@ public class OptitrackStreamingClient : MonoBehaviour
         OptitrackSkeletonDefinition skelDef = GetSkeletonDefinitionById( skeletonId );
         if ( skelDef == null ) return null;
 
-        // 이름 → ID 룩업 테이블
+        // ?대쫫 ??ID 猷⑹뾽 ?뚯씠釉?
         var nameToId = new Dictionary<string, Int32>( skelDef.Bones.Count );
         foreach ( var bone in skelDef.Bones )
             nameToId[bone.Name] = bone.Id;
@@ -1087,7 +1135,7 @@ public class OptitrackStreamingClient : MonoBehaviour
         var map = new Dictionary<Int32, Int32>( skelDef.Bones.Count );
         foreach ( var bone in skelDef.Bones )
         {
-            // "SkeletonName_BoneName" 형식 지원: "_" 뒤의 짧은 이름에서 L/R 접두사 처리
+            // "SkeletonName_BoneName" ?뺤떇 吏€?? "_" ?ㅼ쓽 吏㏃? ?대쫫?먯꽌 L/R ?묐몢??泥섎━
             string fullName  = bone.Name;
             int    sep       = fullName.IndexOf( '_' );
             string prefix    = sep >= 0 ? fullName.Substring( 0, sep + 1 ) : "";   // "Skeleton1_"
@@ -1099,22 +1147,21 @@ public class OptitrackStreamingClient : MonoBehaviour
             if ( mirrorFull != null && nameToId.TryGetValue( mirrorFull, out Int32 mirrorId ) )
                 map[bone.Id] = mirrorId;
             else
-                map[bone.Id] = bone.Id; // 대칭 본은 자기 자신에 매핑
+                map[bone.Id] = bone.Id; // ?€移?蹂몄? ?먭린 ?먯떊??留ㅽ븨
         }
 
         m_mirrorBoneIdMaps[skeletonId] = map;
         return map;
     }
 
-    /// <summary>YZ 평면 기준 회전 미러 (R' = M·R·M, M=diag(-1,1,1)): Y, Z 성분 부호 반전.</summary>
+    /// <summary>YZ ?됰㈃ 湲곗? ?뚯쟾 誘몃윭 (R' = M쨌R쨌M, M=diag(-1,1,1)): Y, Z ?깅텇 遺€??諛섏쟾.</summary>
     private static Quaternion MirrorOrientation( Quaternion q )
         => new Quaternion( q.x, -q.y, -q.z, q.w );
 
-    /// <summary>YZ 평면 기준 위치 미러: X 성분 부호 반전.</summary>
+    /// <summary>YZ ?됰㈃ 湲곗? ?꾩튂 誘몃윭: X ?깅텇 遺€??諛섏쟾.</summary>
     private static Vector3 MirrorPosition( Vector3 pos )
         => new Vector3( -pos.x, pos.y, pos.z );
 
-
     /// <summary>Get the most recently received state for the specified trained markerset.</summary>
     /// <param name="tmarkersetId">
     /// Taken from the corresponding <see cref="OptitrackTMarkersetDefinition.Id"/> field.
@@ -1181,7 +1228,6 @@ public class OptitrackStreamingClient : MonoBehaviour
         }
     }
 
-
     /// <summary>Get the most recently received state for streamed markers.</summary>
     /// <returns>The most recent available marker states, or null if none available.</returns>
     public List<OptitrackMarkerState> GetLatestMarkerStates()
@@ -1206,7 +1252,6 @@ public class OptitrackStreamingClient : MonoBehaviour
         return markerStates;
     }
 
-
     /// <summary>Retrieves the definition of the rigid body with the specified streaming ID.</summary>
     /// <param name="rigidBodyId"></param>
     /// <returns>The specified rigid body definition, or null if not found.</returns>
@@ -1322,7 +1367,6 @@ public class OptitrackStreamingClient : MonoBehaviour
         return tmarkmarkerStates;
     }
 
-
     /// <summary>Request data descriptions from the host, then update our definitions.</summary>
     /// <exception cref="NatNetException">
     /// Thrown by <see cref="NatNetClient.GetDataDescriptions"/> if the request to the server fails.
@@ -1352,13 +1396,13 @@ public class OptitrackStreamingClient : MonoBehaviour
         }
         m_dataDescs = m_client.GetDataDescriptions(descriptionTypeMask);
 
-        // 정의를 성공적으로 받았으므로 자동 재조회 카운터 리셋
+        // ?뺤쓽瑜??깃났?곸쑝濡?諛쏆븯?쇰?濡??먮룞 ?ъ“??移댁슫??由ъ뀑
         m_definitionRefreshCount = 0;
 
         m_rigidBodyDefinitions.Clear();
         m_skeletonDefinitions.Clear();
         m_tmarkersetDefinitions.Clear();
-        m_mirrorBoneIdMaps.Clear(); // 스켈레톤 정의 변경 시 mirror map 캐시 무효화
+        m_mirrorBoneIdMaps.Clear(); // ?ㅼ펷?덊넠 ?뺤쓽 蹂€寃???mirror map 罹먯떆 臾댄슚??
         // Device caches are accessed from NatNet thread; lock them.
         lock (m_frameDataUpdateLock)
         {
@@ -1367,7 +1411,7 @@ public class OptitrackStreamingClient : MonoBehaviour
             m_latestDeviceStates.Clear();
         }
 
-        // NatNet 스레드가 접근하는 캐시는 락으로 보호하여 레이스 방지
+        // NatNet ?ㅻ젅?쒓? ?묎렐?섎뒗 罹먯떆???쎌쑝濡?蹂댄샇?섏뿬 ?덉씠??諛⑹?
         lock (m_frameDataUpdateLock)
         {
             m_assetIdToNameCache.Clear();
@@ -1507,7 +1551,6 @@ public class OptitrackStreamingClient : MonoBehaviour
             m_tmarkersetDefinitions.Add(tmarkDef);
         }
 
-
         // ----------------------------------
         // - Get Marker Definitions (ToDo)
         // ----------------------------------
@@ -1540,7 +1583,6 @@ public class OptitrackStreamingClient : MonoBehaviour
         //    }
         //}
 
-
         // ----------------------------------
         // - Camera Definitions
         // ----------------------------------
@@ -1559,7 +1601,6 @@ public class OptitrackStreamingClient : MonoBehaviour
             m_cameraDefinitions.Add(cameraDef);
         }
 
-
         // ----------------------------------
         // - Force Plate Definitions
         // ----------------------------------
@@ -1594,11 +1635,9 @@ public class OptitrackStreamingClient : MonoBehaviour
                 forcePlateDef.ChannelNames.Add(plate.ChannelNames[i]);
             }
 
-
             m_forcePlateDefinitions.Add(forcePlateDef);
         }
 
-
         // ----------------------------------
         // - Device Definitions (generic analog: iFacialMocap, NIDAQ, etc.)
         // ----------------------------------
@@ -1639,7 +1678,6 @@ public class OptitrackStreamingClient : MonoBehaviour
 
     }
 
-
     public void RegisterRigidBody( MonoBehaviour component, Int32 rigidBodyId )
     {
         if ( m_rigidBodies.ContainsKey( rigidBodyId ) )
@@ -1686,43 +1724,52 @@ public class OptitrackStreamingClient : MonoBehaviour
         SubscribeTMarkerset(component, name);
     }
 
-
     /// <summary>
     /// (Re)initializes <see cref="m_client"/> and connects to the configured streaming server.
-    /// 연결 초기화는 코루틴으로 위임하여 Thread.Sleep으로 메인 스레드를 블락하지 않는다.
+    /// ?곌껐 珥덇린?붾뒗 肄붾（?댁쑝濡??꾩엫?섏뿬 Thread.Sleep?쇰줈 硫붿씤 ?ㅻ젅?쒕? 釉붾씫?섏? ?딅뒗??
     /// </summary>
     void OnEnable()
     {
         m_receivedFrameSinceConnect = false;
-        // AutoReconnect가 켜져있으면 초기 연결 실패 시에도 자동 재시도
+        // AutoReconnect媛€ 耳쒖졇?덉쑝硫?珥덇린 ?곌껐 ?ㅽ뙣 ?쒖뿉???먮룞 ?ъ떆??
         if (AutoReconnect)
             StartCoroutine( InitialConnectWithRetry() );
         else
             StartCoroutine( ConnectCoroutine() );
+
+        if (EnableReplayPriority && m_replayConnectCoroutine == null && ConnectionType != ClientConnectionType.Multicast)
+            m_replayConnectCoroutine = StartCoroutine( ReplayConnectLoop() );
     }
 
     /// <summary>
-    /// 초기 연결을 백오프와 함께 자동 재시도합니다.
-    /// 처리하는 케이스:
-    ///   A) NatNet_Client_Connect 자체가 throw (NatNetError_Network 등) — Motive PC 미응답, 방화벽, 잘못된 IP 등
-    ///   B) Connect는 성공했으나 첫 프레임이 영영 안 옴 — Motive Streaming 미활성화, Multicast 라우팅 차단 등
-    /// 케이스 C(연결 후 프레임 끊김)는 기존 CheckConnectionHealth+ReconnectCoroutine에서 처리됨.
+    /// 珥덇린 ?곌껐??諛깆삤?꾩? ?④퍡 ?먮룞 ?ъ떆?꾪빀?덈떎.
+    /// 泥섎━?섎뒗 耳€?댁뒪:
+    ///   A) NatNet_Client_Connect ?먯껜媛€ throw (NatNetError_Network ?? ??Motive PC 誘몄쓳?? 諛⑺솕踰? ?섎せ??IP ??
+    ///   B) Connect???깃났?덉쑝??泥??꾨젅?꾩씠 ?곸쁺 ??????Motive Streaming 誘명솢?깊솕, Multicast ?쇱슦??李⑤떒 ??
+    /// 耳€?댁뒪 C(?곌껐 ???꾨젅???딄?)??湲곗〈 CheckConnectionHealth+ReconnectCoroutine?먯꽌 泥섎━??
     /// </summary>
     private System.Collections.IEnumerator InitialConnectWithRetry()
     {
         const int maxAttempts = 10;
-        // 백오프: 1, 2, 3, 5, 10, 10, ... 초 (총 약 60초간 시도)
+        // 諛깆삤?? 1, 2, 3, 5, 10, 10, ... 珥?(珥???60珥덇컙 ?쒕룄)
         float[] retryDelays = { 1f, 2f, 3f, 5f, 10f };
 
         for (int attempt = 1; attempt <= maxAttempts; attempt++)
         {
-            // ConnectCoroutine 실행
+            // ConnectCoroutine ?ㅽ뻾
             yield return StartCoroutine(ConnectCoroutine());
 
-            // 케이스 A: m_client가 null이면 Connect() 자체가 실패한 것
-            if (m_client != null)
+            bool transportConnected = m_client != null || m_directNatNetConnected;
+            if (transportConnected)
             {
-                // 케이스 B 확인: Connect는 성공 — 첫 프레임 도착까지 5초 대기
+                if (m_directNatNetConnected && m_client == null)
+                {
+                    if (attempt > 1)
+                        Debug.Log(string.Format("{0}: initial direct NatNet receiver started (attempt {1}/{2}).", GetType().FullName, attempt, maxAttempts), this);
+                    yield break;
+                }
+
+                // 耳€?댁뒪 B ?뺤씤: Connect???깃났 ??泥??꾨젅???꾩갑源뚯? 5珥??€湲?
                 float deadline = Time.realtimeSinceStartup + 5.0f;
                 while (!m_receivedFrameSinceConnect && Time.realtimeSinceStartup < deadline)
                     yield return null;
@@ -1730,33 +1777,35 @@ public class OptitrackStreamingClient : MonoBehaviour
                 if (m_receivedFrameSinceConnect)
                 {
                     if (attempt > 1)
-                        Debug.Log(string.Format("{0}: 초기 연결 성공 (시도 {1}/{2})", GetType().FullName, attempt, maxAttempts), this);
-                    yield break; // 성공
+                        Debug.Log(string.Format("{0}: initial connection succeeded (attempt {1}/{2}).", GetType().FullName, attempt, maxAttempts), this);
+                    yield break; // ?깃났
                 }
 
-                // 케이스 B: 연결됐지만 프레임 미수신 — 클라이언트 정리 후 재시도
-                Debug.LogWarning(string.Format("{0}: 시도 {1}/{2} — 연결됐으나 프레임 미수신. 정리 후 재시도.", GetType().FullName, attempt, maxAttempts), this);
+                // 耳€?댁뒪 B: ?곌껐?먯?留??꾨젅??誘몄닔?????대씪?댁뼵???뺣━ ???ъ떆??
+                Debug.LogWarning(string.Format("{0}: initial connection attempt {1}/{2} connected to {3} but received no frames for 5 seconds. ServerNatNet={4}, ClientNatNet={5}, Local={6}, Connection={7}. Check Motive streaming mode, multicast interface, or NatNet SDK compatibility.", GetType().FullName, attempt, maxAttempts, ServerAddress, ServerNatNetVersion, ClientNatNetVersion, ResolvedLocalAddress, ConnectionType), this);
                 CleanupClient();
             }
 
             if (attempt == maxAttempts)
             {
-                Debug.LogError(string.Format("{0}: {1}회 초기 연결 시도 모두 실패. 인스펙터에서 'Reconnect' 또는 컴포넌트 토글로 수동 재시도하세요.", GetType().FullName, maxAttempts), this);
+                Debug.LogError(string.Format("{0}: all {1} initial connection attempts failed. Reconnect manually from the Inspector.", GetType().FullName, maxAttempts), this);
                 yield break;
             }
 
             float delay = retryDelays[Mathf.Min(attempt - 1, retryDelays.Length - 1)];
-            Debug.Log(string.Format("{0}: 초기 연결 시도 {1}/{2} 실패 — {3}초 후 재시도", GetType().FullName, attempt, maxAttempts, delay), this);
+            Debug.Log(string.Format("{0}: Initial connection attempt {1}/{2} failed; retrying in {3} seconds.", GetType().FullName, attempt, maxAttempts, delay), this);
             yield return new WaitForSeconds(delay);
         }
     }
 
     /// <summary>
-    /// m_client와 관련 코루틴/이벤트를 안전하게 정리합니다.
-    /// InitialConnectWithRetry의 케이스 B 재시도 시 사용.
+    /// m_client?€ 愿€??肄붾（???대깽?몃? ?덉쟾?섍쾶 ?뺣━?⑸땲??
+    /// InitialConnectWithRetry??耳€?댁뒪 B ?ъ떆?????ъ슜.
     /// </summary>
     private void CleanupClient()
     {
+        StopDirectFrameReceiver();
+        m_directNatNetConnected = false;
         if (m_connectionHealthCoroutine != null)
         {
             StopCoroutine(m_connectionHealthCoroutine);
@@ -1771,17 +1820,1035 @@ public class OptitrackStreamingClient : MonoBehaviour
         }
     }
 
+
+    private System.Collections.IEnumerator ReplayConnectLoop()
+    {
+        var retryDelay = new WaitForSeconds(2.0f);
+        while (EnableReplayPriority)
+        {
+            if (m_replayClient == null && !string.IsNullOrWhiteSpace(ReplayServerAddress))
+                yield return StartCoroutine(ConnectReplayCoroutine());
+            else if (m_replayClient != null &&
+                     m_replayReceivedFrameSinceConnect &&
+                     m_lastReplayFrameDeliveryTimestamp.AgeSeconds > 5.0f)
+            {
+                CleanupReplayClient();
+            }
+            yield return retryDelay;
+        }
+        CleanupReplayClient();
+        m_replayConnectCoroutine = null;
+    }
+
+    private System.Collections.IEnumerator ConnectReplayCoroutine()
+    {
+        IPAddress serverAddr;
+        IPAddress localAddr;
+        try
+        {
+            serverAddr = IPAddress.Parse(ReplayServerAddress.Trim());
+            localAddr = ResolveLocalAddress(serverAddr);
+        }
+        catch (Exception ex)
+        {
+            Debug.LogException(ex, this);
+            yield break;
+        }
+
+        NatNetClient connectedClient = null;
+        Exception connectError = null;
+        System.Threading.Tasks.Task connectTask = System.Threading.Tasks.Task.Run(() =>
+        {
+            NatNetClient c = null;
+            try
+            {
+                c = new NatNetClient();
+                c.Connect(
+                    NatNetConnectionType.NatNetConnectionType_Multicast,
+                    localAddr,
+                    serverAddr,
+                    k_DefaultNatNetCommandPort,
+                    k_DefaultNatNetDataPort,
+                    IPAddress.Parse("239.255.42.100"));
+                connectedClient = c;
+            }
+            catch (Exception ex)
+            {
+                connectError = ex;
+                if (c != null) { try { c.Dispose(); } catch { } }
+            }
+        });
+
+        while (!connectTask.IsCompleted)
+            yield return null;
+
+        if (connectError != null || connectedClient == null)
+        {
+            if (!m_replayConnectWarned)
+            {
+                Debug.LogWarning(GetType().FullName + ": Replay NatNet is not available yet. Server=" + ReplayServerAddress + ", local=" + localAddr + ", command=1510, data=1511, multicast=239.255.42.100. This is normal while MMRP is not replaying.", this);
+                m_replayConnectWarned = true;
+            }
+            yield break;
+        }
+
+        CleanupReplayClient();
+        m_replayClient = connectedClient;
+        m_replayReceivedFrameSinceConnect = false;
+        m_replayConnectWarned = false;
+        m_replayClient.NativeFrameReceived += OnNatNetFrameReceived;
+        Debug.Log(GetType().FullName + ": Replay NatNet connected to " + ReplayServerAddress + " (239.255.42.100).", this);
+    }
+
+    private void CleanupReplayClient()
+    {
+        if (m_replayClient != null)
+        {
+            try { m_replayClient.NativeFrameReceived -= OnNatNetFrameReceived; } catch { }
+            try { m_replayClient.Disconnect(); } catch { }
+            try { m_replayClient.Dispose(); } catch { }
+            m_replayClient = null;
+        }
+        m_replayReceivedFrameSinceConnect = false;
+    }
+
+    private bool IsReplayFrameFresh()
+    {
+        return EnableReplayPriority &&
+               m_replayReceivedFrameSinceConnect &&
+               m_lastReplayFrameDeliveryTimestamp.AgeSeconds <= ReplayFreshnessSeconds;
+    }
+
+    private void StartDirectFrameReceiver(string localAddress, string multicastAddress, UInt16 dataPort)
+    {
+        StopDirectFrameReceiver();
+
+        try
+        {
+            IPAddress group = IPAddress.Parse(multicastAddress);
+            IPAddress local = IPAddress.Parse(localAddress);
+
+            m_directFrameUdp = new UdpClient(AddressFamily.InterNetwork);
+            m_directFrameUdp.ExclusiveAddressUse = false;
+            m_directFrameUdp.Client.ReceiveBufferSize = 1024 * 1024;
+            m_directFrameUdp.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
+            m_directFrameUdp.Client.Bind(new IPEndPoint(IPAddress.Any, dataPort));
+            m_directFrameUdp.Client.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(group, local));
+            if (EnableReplayPriority)
+            {
+                try
+                {
+                    IPAddress replayGroup = IPAddress.Parse("239.255.42.100");
+                    if (!replayGroup.Equals(group))
+                        m_directFrameUdp.Client.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(replayGroup, local));
+                }
+                catch (Exception ex)
+                {
+                    Debug.LogWarning(GetType().FullName + ": direct NatNet replay multicast join failed: " + ex.Message, this);
+                }
+            }
+            m_directFrameUdp.Client.ReceiveTimeout = 1000;
+
+            m_directFrameRunning = true;
+            m_directNatNetConnected = true;
+            m_directFrameLogged = false;
+            m_directTimeoutCount = 0;
+            m_directTimeoutLogPending = false;
+            m_directSocketErrorLogPending = false;
+            m_directFrameThread = new Thread(DirectFrameThreadLoop)
+            {
+                IsBackground = true,
+                Name = "OptitrackStreamingClient.DirectNatNet"
+            };
+            m_directFrameThread.Start();
+            Debug.Log(GetType().FullName + ": direct NatNet frame receiver joined " + multicastAddress + ":" + dataPort + " on " + localAddress + (EnableReplayPriority ? " with replay priority group 239.255.42.100." : "."), this);
+        }
+        catch (Exception ex)
+        {
+            StopDirectFrameReceiver();
+            Debug.LogWarning(GetType().FullName + ": direct NatNet frame receiver failed to start: " + ex.Message, this);
+        }
+    }
+
+    private void StopDirectFrameReceiver()
+    {
+        m_directFrameRunning = false;
+        m_directFrameLogPending = false;
+        m_directTimeoutLogPending = false;
+        m_directSocketErrorLogPending = false;
+        m_directNatNetConnected = false;
+        try { m_directFrameUdp?.Close(); } catch { }
+        m_directFrameUdp = null;
+
+        if (m_directFrameThread != null && m_directFrameThread.IsAlive)
+            m_directFrameThread.Join(500);
+        m_directFrameThread = null;
+    }
+
+    private void DirectFrameThreadLoop()
+    {
+        IPEndPoint ep = new IPEndPoint(IPAddress.Any, 0);
+        while (m_directFrameRunning)
+        {
+            try
+            {
+                byte[] data = m_directFrameUdp.Receive(ref ep);
+                m_directTimeoutCount = 0;
+                ParseDirectFramePacket(data, ep.Address);
+            }
+            catch (SocketException se)
+            {
+                if (!m_directFrameRunning) break;
+                if (se.SocketErrorCode == SocketError.TimedOut)
+                {
+                    int timeoutCount = Interlocked.Increment(ref m_directTimeoutCount);
+                    if (timeoutCount == 5 || timeoutCount == 15)
+                        m_directTimeoutLogPending = true;
+                    continue;
+                }
+                m_directSocketErrorMessage = se.SocketErrorCode + " / " + se.Message;
+                m_directSocketErrorLogPending = true;
+            }
+            catch (ObjectDisposedException)
+            {
+                break;
+            }
+            catch (Exception ex)
+            {
+                m_directSocketErrorMessage = ex.GetType().Name + " / " + ex.Message;
+                m_directSocketErrorLogPending = true;
+            }
+        }
+    }
+
+    private void ParseDirectFramePacket(byte[] data, IPAddress sourceAddress)
+    {
+        if (data == null || data.Length < 12) return;
+        if (BitConverter.ToUInt16(data, 0) != 7) return; // NAT_FRAMEOFDATA
+
+        int o = 4;
+        int frameNumber = BitConverter.ToInt32(data, o); o += 4;
+        OptitrackHiResTimer.Timestamp frameTimestamp = OptitrackHiResTimer.Now();
+        if (!m_directFrameLogged)
+        {
+            m_directFrameLogged = true;
+            m_directFrameLogPending = true;
+        }
+        bool isReplayFrame = EnableReplayPriority &&
+                             !string.IsNullOrWhiteSpace(ReplayServerAddress) &&
+                             sourceAddress != null &&
+                             sourceAddress.ToString() == ReplayServerAddress.Trim();
+
+        if (!isReplayFrame && IsReplayFrameFresh())
+            return;
+
+        if (isReplayFrame)
+        {
+            m_replayReceivedFrameSinceConnect = true;
+            Interlocked.Exchange(ref m_lastReplayFrameDeliveryTimestamp.m_ticks, frameTimestamp.m_ticks);
+        }
+        else
+        {
+            m_receivedFrameSinceConnect = true;
+            Interlocked.Exchange(ref m_lastFrameDeliveryTimestamp.m_ticks, frameTimestamp.m_ticks);
+        }
+
+        if (!Monitor.TryEnter(m_frameDataUpdateLock, 1))
+            return;
+
+        try
+        {
+            int rbCount, rbStart, rbEnd;
+            if (!ReadDirectSection(data, ref o, out rbCount, out rbStart, out rbEnd)) return; // markerSets
+            if (!ReadDirectSection(data, ref o, out rbCount, out rbStart, out rbEnd)) return; // unlabeled
+            if (!ReadDirectSection(data, ref o, out rbCount, out rbStart, out rbEnd)) return; // rigidBodies
+            ParseDirectRigidBodies(data, rbCount, rbStart, rbEnd, frameTimestamp);
+
+            int skelCount, skelStart, skelEnd;
+            if (!ReadDirectSection(data, ref o, out skelCount, out skelStart, out skelEnd)) return; // skeletons
+            ParseDirectSkeletons(data, skelCount, skelStart, skelEnd, frameTimestamp);
+
+            int skipCount, skipStart, skipEnd;
+            if (!ReadDirectSection(data, ref o, out skipCount, out skipStart, out skipEnd)) return; // assets
+            if (!ReadDirectSection(data, ref o, out skipCount, out skipStart, out skipEnd)) return; // labeled markers
+            if (!ReadDirectSection(data, ref o, out skipCount, out skipStart, out skipEnd)) return; // force plates
+
+            int deviceCount, deviceStart, deviceEnd;
+            if (!ReadDirectSection(data, ref o, out deviceCount, out deviceStart, out deviceEnd)) return; // devices
+            ParseDirectDevices(data, deviceCount, deviceStart, deviceEnd, frameNumber, frameTimestamp);
+
+        }
+        finally
+        {
+            Monitor.Exit(m_frameDataUpdateLock);
+        }
+    }
+
+    private void ParseDirectDevices(byte[] data, int count, int start, int end, int frameNumber, OptitrackHiResTimer.Timestamp frameTimestamp)
+    {
+        if (!ReceiveDevices)
+            return;
+
+        m_latestDeviceStates.Clear();
+
+        int o = start;
+        for (int i = 0; i < count && o + 8 <= end; i++)
+        {
+            int id = BitConverter.ToInt32(data, o); o += 4;
+            int channelCount = BitConverter.ToInt32(data, o); o += 4;
+            if (channelCount < 0 || channelCount > 4096)
+                return;
+
+            OptitrackDeviceDefinition definition = m_deviceDefinitions.Find(d => d.Id == id);
+            Dictionary<string, float> values = new Dictionary<string, float>(channelCount);
+
+            for (int ch = 0; ch < channelCount; ch++)
+            {
+                if (o + 4 > end) return;
+                int sampleCount = BitConverter.ToInt32(data, o); o += 4;
+                if (sampleCount < 0 || sampleCount > 1024 || o + sampleCount * 4 > end) return;
+
+                float value = sampleCount > 0 ? BitConverter.ToSingle(data, o) : 0.0f;
+                o += sampleCount * 4;
+
+                string channelName = (definition != null && definition.ChannelNames != null && ch < definition.ChannelNames.Count)
+                    ? definition.ChannelNames[ch]
+                    : "Channel" + ch;
+                values[channelName] = value;
+            }
+
+            int stateKey = DirectDeviceStateKey(id, i);
+            string deviceName = definition != null ? definition.Name : ("Device" + stateKey);
+            m_latestDeviceStates[stateKey] = new OptitrackDeviceState
+            {
+                Id = stateKey,
+                Name = deviceName,
+                ChannelValues = values,
+                FrameNumber = frameNumber,
+                DeliveryTimestamp = frameTimestamp,
+            };
+        }
+    }
+
+    private static int DirectDeviceStateKey(int deviceId, int wireIndex)
+    {
+        return deviceId != 0 ? deviceId : -1 - wireIndex;
+    }
+
+    private static bool ReadDirectSection(byte[] data, ref int o, out int count, out int start, out int end)
+    {
+        count = 0;
+        start = end = o;
+        if (o + 8 > data.Length) return false;
+        count = BitConverter.ToInt32(data, o); o += 4;
+        int size = BitConverter.ToInt32(data, o); o += 4;
+        if (count < 0 || size < 0 || o + size > data.Length) return false;
+        start = o;
+        end = o + size;
+        o = end;
+        return true;
+    }
+
+    private static bool ReadDirectRigidBody(byte[] data, ref int o, int end, out sRigidBodyData rb)
+    {
+        rb = new sRigidBodyData();
+        if (o + 38 > end || o + 38 > data.Length) return false;
+        rb.Id = BitConverter.ToInt32(data, o); o += 4;
+        rb.X = BitConverter.ToSingle(data, o); o += 4;
+        rb.Y = BitConverter.ToSingle(data, o); o += 4;
+        rb.Z = BitConverter.ToSingle(data, o); o += 4;
+        rb.QX = BitConverter.ToSingle(data, o); o += 4;
+        rb.QY = BitConverter.ToSingle(data, o); o += 4;
+        rb.QZ = BitConverter.ToSingle(data, o); o += 4;
+        rb.QW = BitConverter.ToSingle(data, o); o += 4;
+        rb.MeanError = BitConverter.ToSingle(data, o); o += 4;
+        rb.Params = BitConverter.ToInt16(data, o); o += 2;
+        return true;
+    }
+
+    private void ParseDirectRigidBodies(byte[] data, int count, int start, int end, OptitrackHiResTimer.Timestamp frameTimestamp)
+    {
+        int o = start;
+        for (int i = 0; i < count && o < end; i++)
+        {
+            sRigidBodyData rbData;
+            if (!ReadDirectRigidBody(data, ref o, end, out rbData)) return;
+            OptitrackRigidBodyState rbState = GetOrCreateRigidBodyState(rbData.Id);
+            RigidBodyDataToState(rbData, frameTimestamp, rbState);
+        }
+    }
+
+    private void ParseDirectSkeletons(byte[] data, int count, int start, int end, OptitrackHiResTimer.Timestamp frameTimestamp)
+    {
+        int o = start;
+        for (int i = 0; i < count && o + 8 <= end; i++)
+        {
+            int skeletonId = BitConverter.ToInt32(data, o); o += 4;
+            int boneCount = BitConverter.ToInt32(data, o); o += 4;
+            if (boneCount < 0 || boneCount > 4096 || o + boneCount * 38 > end) return;
+
+            sRigidBodyData[] stagedBones = GetSkeletonFrameScratch(skeletonId, boneCount);
+            for (int b = 0; b < boneCount; b++)
+            {
+                if (!ReadDirectRigidBody(data, ref o, end, out stagedBones[b])) return;
+            }
+
+            CommitDirectSkeletonFrame(skeletonId, stagedBones, boneCount, frameTimestamp);
+        }
+    }
+
+    private void CommitDirectSkeletonFrame(int skeletonId, sRigidBodyData[] stagedBones, int boneCount, OptitrackHiResTimer.Timestamp frameTimestamp)
+    {
+        OptitrackSkeletonDefinition skelDef = GetSkeletonDefinitionById(skeletonId);
+        if (skelDef == null)
+        {
+            skelDef = EnsureDirectSyntheticSkeletonDefinition(skeletonId, stagedBones, boneCount);
+        }
+
+        if (skelDef == null)
+        {
+            if (!m_pendingDefinitionRefresh && m_definitionRefreshCount < k_MaxAutoDefinitionRefreshes)
+                m_pendingDefinitionRefresh = true;
+            return;
+        }
+
+        if (EnableSkeletonFrameFilter && boneCount != skelDef.Bones.Count)
+            return;
+
+        OptitrackSkeletonState skelState = GetOrCreateSkeletonState(skeletonId);
+
+        if (EnableSkeletonFrameFilter)
+        {
+            for (int b = 0; b < boneCount; b++)
+            {
+                int boneSkelId, boneId;
+                DirectDecodeId(stagedBones[b].Id, out boneSkelId, out boneId);
+                if (boneSkelId != skeletonId ||
+                    !skelDef.BoneIdToParentIdMap.ContainsKey(boneId) ||
+                    !IsSkeletonBoneTracked(stagedBones[b]) ||
+                    !IsBoneDataUsable(stagedBones[b]))
+                {
+                    return;
+                }
+            }
+        }
+
+        for (int b = 0; b < boneCount; b++)
+        {
+            sRigidBodyData boneData = stagedBones[b];
+            if (!TryGetDirectCommittableBoneId(boneData, skeletonId, skelDef, out int boneId))
+                continue;
+
+            if (!skelState.BonePoses.ContainsKey(boneId))
+                skelState.BonePoses[boneId] = new OptitrackPose();
+            if (!skelState.LocalBonePoses.ContainsKey(boneId))
+                skelState.LocalBonePoses[boneId] = new OptitrackPose();
+
+            skelState.BonePoses[boneId].Position = new Vector3(-boneData.X, boneData.Y, boneData.Z);
+            skelState.BonePoses[boneId].Orientation = new Quaternion(-boneData.QX, boneData.QY, boneData.QZ, -boneData.QW);
+        }
+
+        for (int b = 0; b < boneCount; b++)
+        {
+            sRigidBodyData boneData = stagedBones[b];
+            if (!TryGetDirectCommittableBoneId(boneData, skeletonId, skelDef, out int boneId))
+                continue;
+
+            Vector3 bonePos = skelState.BonePoses[boneId].Position;
+            Quaternion boneOri = skelState.BonePoses[boneId].Orientation;
+            Vector3 parentBonePos = Vector3.zero;
+            Quaternion parentBoneOri = Quaternion.identity;
+
+            Int32 parentId = skelDef.BoneIdToParentIdMap[boneId];
+            if (parentId != 0 && skelState.BonePoses.TryGetValue(parentId, out OptitrackPose parentPose))
+            {
+                parentBonePos = parentPose.Position;
+                parentBoneOri = parentPose.Orientation;
+            }
+
+            skelState.LocalBonePoses[boneId].Position = bonePos - parentBonePos;
+            skelState.LocalBonePoses[boneId].Orientation = Quaternion.Inverse(parentBoneOri) * boneOri;
+        }
+        skelState.DeliveryTimestamp = frameTimestamp;
+    }
+
+    private static void DirectDecodeId(int encodedId, out int assetId, out int memberId)
+    {
+        assetId = (encodedId >> 16) & 0x7FFF;
+        memberId = encodedId & 0xFFFF;
+    }
+
+    private static bool TryGetDirectCommittableBoneId(sRigidBodyData boneData, Int32 skeletonId, OptitrackSkeletonDefinition skelDef, out int boneId)
+    {
+        int boneSkelId;
+        DirectDecodeId(boneData.Id, out boneSkelId, out boneId);
+        return boneSkelId == skeletonId &&
+               skelDef.BoneIdToParentIdMap.ContainsKey(boneId) &&
+               IsBoneDataUsable(boneData);
+    }
+
+    private OptitrackSkeletonDefinition EnsureDirectSyntheticSkeletonDefinition(int skeletonId, sRigidBodyData[] stagedBones, int boneCount)
+    {
+        OptitrackSkeletonDefinition existing = GetSkeletonDefinitionById(skeletonId);
+        if (existing != null)
+            return existing;
+
+        string skeletonName = ChooseSyntheticSkeletonName(skeletonId);
+        OptitrackSkeletonDefinition skelDef = new OptitrackSkeletonDefinition
+        {
+            Id = skeletonId,
+            Name = skeletonName,
+            Bones = new List<OptitrackSkeletonDefinition.BoneDefinition>(boneCount),
+            BoneIdToParentIdMap = new Dictionary<int, int>(),
+        };
+
+        for (int i = 0; i < boneCount; i++)
+        {
+            int boneSkelId, boneId;
+            DirectDecodeId(stagedBones[i].Id, out boneSkelId, out boneId);
+            if (boneSkelId != skeletonId)
+                continue;
+
+            string shortName = DirectMotiveBoneName(boneId);
+            int parentId = DirectMotiveParentId(boneId);
+            OptitrackSkeletonDefinition.BoneDefinition boneDef = new OptitrackSkeletonDefinition.BoneDefinition
+            {
+                Id = boneId,
+                ParentId = parentId,
+                Name = skeletonName + "_" + shortName,
+                Offset = Vector3.zero,
+            };
+            skelDef.Bones.Add(boneDef);
+            skelDef.BoneIdToParentIdMap[boneDef.Id] = boneDef.ParentId;
+        }
+
+        if (skelDef.Bones.Count == 0)
+            return null;
+
+        m_skeletonDefinitions.Add(skelDef);
+        m_mirrorBoneIdMaps.Clear();
+        return skelDef;
+    }
+
+    private string ChooseSyntheticSkeletonName(int skeletonId)
+    {
+        if (!string.IsNullOrWhiteSpace(DirectSyntheticSkeletonName))
+            return DirectSyntheticSkeletonName.Trim();
+        return "Skeleton" + skeletonId;
+    }
+
+    private static string DirectMotiveBoneName(int boneId)
+    {
+        switch (boneId)
+        {
+            case 1: return "Hip";
+            case 2: return "Ab";
+            case 52: return "Spine2";
+            case 53: return "Spine3";
+            case 54: return "Spine4";
+            case 3: return "Chest";
+            case 4: return "Neck";
+            case 58: return "Neck2";
+            case 5: return "Head";
+            case 6: return "LShoulder";
+            case 7: return "LUArm";
+            case 8: return "LFArm";
+            case 9: return "LHand";
+            case 22: return "LThumb1";
+            case 23: return "LThumb2";
+            case 24: return "LThumb3";
+            case 25: return "LIndex1";
+            case 26: return "LIndex2";
+            case 27: return "LIndex3";
+            case 28: return "LMiddle1";
+            case 29: return "LMiddle2";
+            case 30: return "LMiddle3";
+            case 31: return "LRing1";
+            case 32: return "LRing2";
+            case 33: return "LRing3";
+            case 34: return "LPinky1";
+            case 35: return "LPinky2";
+            case 36: return "LPinky3";
+            case 10: return "RShoulder";
+            case 11: return "RUArm";
+            case 12: return "RFArm";
+            case 13: return "RHand";
+            case 37: return "RThumb1";
+            case 38: return "RThumb2";
+            case 39: return "RThumb3";
+            case 40: return "RIndex1";
+            case 41: return "RIndex2";
+            case 42: return "RIndex3";
+            case 43: return "RMiddle1";
+            case 44: return "RMiddle2";
+            case 45: return "RMiddle3";
+            case 46: return "RRing1";
+            case 47: return "RRing2";
+            case 48: return "RRing3";
+            case 49: return "RPinky1";
+            case 50: return "RPinky2";
+            case 51: return "RPinky3";
+            case 14: return "LThigh";
+            case 15: return "LShin";
+            case 16: return "LFoot";
+            case 17: return "LToe";
+            case 18: return "RThigh";
+            case 19: return "RShin";
+            case 20: return "RFoot";
+            case 21: return "RToe";
+            default: return "Bone" + boneId;
+        }
+    }
+
+    private static int DirectMotiveParentId(int boneId)
+    {
+        switch (boneId)
+        {
+            case 1: return 0;
+            case 2: return 1;
+            case 52: return 2;
+            case 53: return 52;
+            case 54: return 53;
+            case 3: return 54;
+            case 4: return 3;
+            case 58: return 4;
+            case 5: return 58;
+            case 6: return 3;
+            case 7: return 6;
+            case 8: return 7;
+            case 9: return 8;
+            case 22: return 9;
+            case 23: return 22;
+            case 24: return 23;
+            case 25: return 9;
+            case 26: return 25;
+            case 27: return 26;
+            case 28: return 9;
+            case 29: return 28;
+            case 30: return 29;
+            case 31: return 9;
+            case 32: return 31;
+            case 33: return 32;
+            case 34: return 9;
+            case 35: return 34;
+            case 36: return 35;
+            case 10: return 3;
+            case 11: return 10;
+            case 12: return 11;
+            case 13: return 12;
+            case 37: return 13;
+            case 38: return 37;
+            case 39: return 38;
+            case 40: return 13;
+            case 41: return 40;
+            case 42: return 41;
+            case 43: return 13;
+            case 44: return 43;
+            case 45: return 44;
+            case 46: return 13;
+            case 47: return 46;
+            case 48: return 47;
+            case 49: return 13;
+            case 50: return 49;
+            case 51: return 50;
+            case 14: return 1;
+            case 15: return 14;
+            case 16: return 15;
+            case 17: return 16;
+            case 18: return 1;
+            case 19: return 18;
+            case 20: return 19;
+            case 21: return 20;
+            default: return 0;
+        }
+    }
+
+    private bool ConnectDirectNatNet(IPAddress serverAddr, IPAddress localAddr, UInt16 commandPort, UInt16 dataPort, IPAddress multicastAddr)
+    {
+        StopDirectFrameReceiver();
+
+        string hostName;
+        byte[] appVersion;
+        byte[] natNetVersion;
+        byte[] modelDefPacket;
+        UInt16 negotiatedDataPort = dataPort;
+        IPAddress negotiatedMulticast = multicastAddr;
+
+        bool hasServerInfo = DirectRequestServerInfo(serverAddr, localAddr, commandPort, out hostName, out appVersion, out natNetVersion, out negotiatedDataPort, out negotiatedMulticast);
+        if (!hasServerInfo)
+        {
+            hostName = "NatNet multicast source";
+            appVersion = new byte[4];
+            natNetVersion = new byte[] { 4, 2, 0, 0 };
+            negotiatedDataPort = dataPort;
+            negotiatedMulticast = multicastAddr ?? IPAddress.Parse("239.255.42.99");
+            if (!m_directNoModelDefWarned)
+            {
+                Debug.LogWarning(GetType().FullName + ": NatNet command channel did not respond on " + serverAddr + ":" + commandPort + ". Continuing with multicast frames and synthetic skeleton definitions.", this);
+                m_directNoModelDefWarned = true;
+            }
+        }
+
+        if (negotiatedDataPort == 0)
+            negotiatedDataPort = dataPort;
+        if (negotiatedMulticast == null)
+            negotiatedMulticast = multicastAddr ?? IPAddress.Parse("239.255.42.99");
+
+        if (hasServerInfo && DirectRequestModelDef(serverAddr, localAddr, commandPort, out modelDefPacket))
+        {
+            if (!SkipDataDescriptions && !DirectUpdateDefinitions(modelDefPacket))
+                Debug.LogWarning(GetType().FullName + ": direct NatNet MODELDEF parse failed. Falling back to synthetic skeleton definitions from incoming frames.", this);
+        }
+        else if (hasServerInfo && !m_directNoModelDefWarned)
+        {
+            Debug.LogWarning(GetType().FullName + ": direct NatNet MODELDEF request failed. Falling back to synthetic skeleton definitions from incoming frames.", this);
+            m_directNoModelDefWarned = true;
+        }
+
+        ServerNatNetVersion = natNetVersion[0] + "." + natNetVersion[1] + "." + natNetVersion[2] + "." + natNetVersion[3];
+        ClientNatNetVersion = "Direct UDP";
+        m_directNatNetConnected = true;
+        StartDirectFrameReceiver(localAddr.ToString(), negotiatedMulticast.ToString(), negotiatedDataPort);
+        Debug.Log(GetType().FullName + ": Connected to direct NatNet server. Server=" + serverAddr + ", host=" + hostName + ", local=" + localAddr + ", serverNatNet=" + ServerNatNetVersion + ", multicast=" + negotiatedMulticast + ":" + negotiatedDataPort + ".", this);
+        return true;
+    }
+
+    private bool DirectRequestServerInfo(IPAddress serverAddr, IPAddress localAddr, UInt16 commandPort, out string hostName, out byte[] appVersion, out byte[] natNetVersion, out UInt16 dataPort, out IPAddress multicastAddress)
+    {
+        hostName = "";
+        appVersion = new byte[4];
+        natNetVersion = new byte[4];
+        dataPort = 0;
+        multicastAddress = null;
+
+        byte[] response;
+        byte[] pingPayload = DirectBuildPingPayload();
+        if (!DirectCommandRequest(serverAddr, localAddr, commandPort, 0, pingPayload, 2000, out response)) // NAT_PING
+            return false;
+        if (response.Length < 4 || BitConverter.ToUInt16(response, 0) != 1) // NAT_PINGRESPONSE / server info
+            return false;
+
+        int payloadLen = BitConverter.ToUInt16(response, 2);
+        if (payloadLen < 268 || response.Length < 4 + payloadLen)
+            return false;
+
+        int o = 4;
+        hostName = DirectReadFixedString(response, o, 256);
+        o += 256;
+        Buffer.BlockCopy(response, o, appVersion, 0, 4); o += 4;
+        Buffer.BlockCopy(response, o, natNetVersion, 0, 4); o += 4;
+
+        // NatNet 4.x server info may append clock frequency, data port, multicast flag and multicast address.
+        if (response.Length >= o + 8)
+            o += 8;
+        if (response.Length >= o + 2)
+        {
+            dataPort = BitConverter.ToUInt16(response, o);
+            o += 2;
+        }
+        if (response.Length >= o + 1)
+            o += 1; // multicast flag
+        if (response.Length >= o + 4)
+        {
+            byte a = response[o], b = response[o + 1], c = response[o + 2], d = response[o + 3];
+            if (a != 0 || b != 0 || c != 0 || d != 0)
+                multicastAddress = new IPAddress(new byte[] { a, b, c, d });
+        }
+        return true;
+    }
+
+    private bool DirectRequestModelDef(IPAddress serverAddr, IPAddress localAddr, UInt16 commandPort, out byte[] modelDefPacket)
+    {
+        modelDefPacket = null;
+        byte[] response;
+        if (!DirectCommandRequest(serverAddr, localAddr, commandPort, 4, null, 3000, out response)) // NAT_REQUEST_MODELDEF
+            return false;
+        if (response.Length < 8 || BitConverter.ToUInt16(response, 0) != 5) // NAT_MODELDEF
+            return false;
+        modelDefPacket = response;
+        return true;
+    }
+
+    private bool DirectCommandRequest(IPAddress serverAddr, IPAddress localAddr, UInt16 commandPort, UInt16 messageId, byte[] payload, int timeoutMs, out byte[] response)
+    {
+        response = null;
+        try
+        {
+            using (UdpClient udp = new UdpClient())
+            {
+                udp.Client.ReceiveTimeout = timeoutMs;
+                udp.Client.Bind(new IPEndPoint(localAddr, 0));
+                byte[] packet = DirectBuildPacket(messageId, payload);
+                udp.Send(packet, packet.Length, new IPEndPoint(serverAddr, commandPort));
+                IPEndPoint remote = new IPEndPoint(IPAddress.Any, 0);
+                response = udp.Receive(ref remote);
+                return response != null && response.Length >= 4;
+            }
+        }
+        catch (Exception ex)
+        {
+            Debug.LogWarning(GetType().FullName + ": direct NatNet command " + messageId + " failed against " + serverAddr + ":" + commandPort + " (" + ex.Message + ").", this);
+            return false;
+        }
+    }
+
+    private static byte[] DirectBuildPacket(UInt16 messageId, byte[] payload)
+    {
+        int payloadLen = payload != null ? payload.Length : 0;
+        byte[] packet = new byte[4 + payloadLen];
+        Array.Copy(BitConverter.GetBytes(messageId), 0, packet, 0, 2);
+        Array.Copy(BitConverter.GetBytes((UInt16)payloadLen), 0, packet, 2, 2);
+        if (payloadLen > 0)
+            Buffer.BlockCopy(payload, 0, packet, 4, payloadLen);
+        return packet;
+    }
+
+    private static byte[] DirectBuildPingPayload()
+    {
+        byte[] payload = new byte[264];
+        byte[] name = Encoding.ASCII.GetBytes("UnityDirectNatNet");
+        Buffer.BlockCopy(name, 0, payload, 0, Math.Min(name.Length, 255));
+        payload[256] = 4;
+        payload[257] = 0;
+        payload[258] = 0;
+        payload[259] = 0;
+        payload[260] = 4;
+        payload[261] = 2;
+        payload[262] = 0;
+        payload[263] = 0;
+        return payload;
+    }
+
+    private bool DirectUpdateDefinitions(byte[] modelDefPacket)
+    {
+        if (modelDefPacket == null || modelDefPacket.Length < 8)
+            return false;
+
+        int payloadLen = BitConverter.ToUInt16(modelDefPacket, 2);
+        int end = Math.Min(modelDefPacket.Length, 4 + payloadLen);
+        int o = 4;
+        if (o + 4 > end)
+            return false;
+
+        List<OptitrackRigidBodyDefinition> rigidBodies = new List<OptitrackRigidBodyDefinition>();
+        List<OptitrackSkeletonDefinition> skeletons = new List<OptitrackSkeletonDefinition>();
+        List<OptitrackDeviceDefinition> devices = new List<OptitrackDeviceDefinition>();
+
+        int dataSetCount = BitConverter.ToInt32(modelDefPacket, o); o += 4;
+        for (int i = 0; i < dataSetCount && o + 8 <= end; i++)
+        {
+            int dataSetType = BitConverter.ToInt32(modelDefPacket, o); o += 4;
+            int dataSetSize = BitConverter.ToInt32(modelDefPacket, o); o += 4;
+            if (dataSetSize < 0 || o + dataSetSize > end)
+                return false;
+
+            int dataSetEnd = o + dataSetSize;
+            try
+            {
+                if (dataSetType == 1)
+                {
+                    rigidBodies.Add(DirectReadRigidBodyDefinition(modelDefPacket, ref o, dataSetEnd));
+                }
+                else if (dataSetType == 2)
+                {
+                    skeletons.Add(DirectReadSkeletonDefinition(modelDefPacket, ref o, dataSetEnd));
+                }
+                else if (dataSetType == 4)
+                {
+                    devices.Add(DirectReadDeviceDefinition(modelDefPacket, ref o, dataSetEnd));
+                }
+            }
+            catch
+            {
+                return false;
+            }
+
+            o = dataSetEnd;
+        }
+
+        m_definitionRefreshCount = 0;
+        m_rigidBodyDefinitions.Clear();
+        m_skeletonDefinitions.Clear();
+        m_tmarkersetDefinitions.Clear();
+        m_mirrorBoneIdMaps.Clear();
+        m_rigidBodyDefinitions.AddRange(rigidBodies);
+        m_skeletonDefinitions.AddRange(skeletons);
+
+        lock (m_frameDataUpdateLock)
+        {
+            m_deviceDefinitions.Clear();
+            m_deviceNameToId.Clear();
+            m_latestDeviceStates.Clear();
+            m_assetIdToNameCache.Clear();
+
+            foreach (OptitrackDeviceDefinition deviceDef in devices)
+            {
+                m_deviceDefinitions.Add(deviceDef);
+                if (!string.IsNullOrEmpty(deviceDef.Name))
+                    m_deviceNameToId[deviceDef.Name] = deviceDef.Id;
+            }
+        }
+
+        return true;
+    }
+
+    private static OptitrackRigidBodyDefinition DirectReadRigidBodyDefinition(byte[] data, ref int o, int end)
+    {
+        string name;
+        int id, parentId, markerCount;
+        Vector3 offset;
+        DirectReadRigidBodyDesc(data, ref o, end, out name, out id, out parentId, out offset, out markerCount);
+
+        OptitrackRigidBodyDefinition rbDef = new OptitrackRigidBodyDefinition
+        {
+            Id = id,
+            Name = name,
+            Markers = new List<OptitrackRigidBodyDefinition.MarkerDefinition>(Math.Max(0, markerCount)),
+        };
+
+        for (int i = 0; i < markerCount; i++)
+            rbDef.Markers.Add(new OptitrackRigidBodyDefinition.MarkerDefinition());
+        return rbDef;
+    }
+
+    private static OptitrackSkeletonDefinition DirectReadSkeletonDefinition(byte[] data, ref int o, int end)
+    {
+        string name = DirectReadCString(data, ref o, end);
+        int id = DirectReadInt32(data, ref o, end);
+        int boneCount = DirectReadInt32(data, ref o, end);
+
+        OptitrackSkeletonDefinition skelDef = new OptitrackSkeletonDefinition
+        {
+            Id = id,
+            Name = name,
+            Bones = new List<OptitrackSkeletonDefinition.BoneDefinition>(Math.Max(0, boneCount)),
+            BoneIdToParentIdMap = new Dictionary<int, int>(),
+        };
+
+        for (int i = 0; i < boneCount; i++)
+        {
+            string boneName;
+            int boneId, parentId, markerCount;
+            Vector3 offset;
+            DirectReadRigidBodyDesc(data, ref o, end, out boneName, out boneId, out parentId, out offset, out markerCount);
+            OptitrackSkeletonDefinition.BoneDefinition boneDef = new OptitrackSkeletonDefinition.BoneDefinition
+            {
+                Id = boneId,
+                ParentId = parentId,
+                Name = boneName,
+                Offset = offset,
+            };
+            skelDef.Bones.Add(boneDef);
+            skelDef.BoneIdToParentIdMap[boneDef.Id] = boneDef.ParentId;
+        }
+
+        return skelDef;
+    }
+
+    private static OptitrackDeviceDefinition DirectReadDeviceDefinition(byte[] data, ref int o, int end)
+    {
+        int id = DirectReadInt32(data, ref o, end);
+        string name = DirectReadCString(data, ref o, end);
+        string serial = DirectReadCString(data, ref o, end);
+        int deviceType = DirectReadInt32(data, ref o, end);
+        int channelDataType = DirectReadInt32(data, ref o, end);
+        int channelCount = DirectReadInt32(data, ref o, end);
+
+        OptitrackDeviceDefinition deviceDef = new OptitrackDeviceDefinition
+        {
+            Id = id,
+            Name = name,
+            SerialNumber = serial,
+            DeviceType = deviceType,
+            ChannelDataType = channelDataType,
+            ChannelCount = channelCount,
+            ChannelNames = new List<string>(Math.Max(0, channelCount)),
+        };
+
+        for (int i = 0; i < channelCount; i++)
+            deviceDef.ChannelNames.Add(DirectReadCString(data, ref o, end));
+        return deviceDef;
+    }
+
+    private static void DirectReadRigidBodyDesc(byte[] data, ref int o, int end, out string name, out int id, out int parentId, out Vector3 offset, out int markerCount)
+    {
+        name = DirectReadCString(data, ref o, end);
+        id = DirectReadInt32(data, ref o, end);
+        parentId = DirectReadInt32(data, ref o, end);
+        float x = DirectReadFloat(data, ref o, end);
+        float y = DirectReadFloat(data, ref o, end);
+        float z = DirectReadFloat(data, ref o, end);
+        offset = new Vector3(-x, y, z);
+
+        // Orientation offset is present in NatNet 4.x descriptions.
+        DirectReadFloat(data, ref o, end);
+        DirectReadFloat(data, ref o, end);
+        DirectReadFloat(data, ref o, end);
+        DirectReadFloat(data, ref o, end);
+
+        markerCount = DirectReadInt32(data, ref o, end);
+        int markerBytes = markerCount * (12 + 4);
+        if (markerCount < 0 || o + markerBytes > end)
+            throw new ArgumentOutOfRangeException("markerCount");
+        o += markerBytes;
+        for (int i = 0; i < markerCount; i++)
+            DirectReadCString(data, ref o, end);
+    }
+
+    private static int DirectReadInt32(byte[] data, ref int o, int end)
+    {
+        if (o + 4 > end) throw new ArgumentOutOfRangeException("o");
+        int v = BitConverter.ToInt32(data, o);
+        o += 4;
+        return v;
+    }
+
+    private static float DirectReadFloat(byte[] data, ref int o, int end)
+    {
+        if (o + 4 > end) throw new ArgumentOutOfRangeException("o");
+        float v = BitConverter.ToSingle(data, o);
+        o += 4;
+        return v;
+    }
+
+    private static string DirectReadCString(byte[] data, ref int o, int end)
+    {
+        if (o >= end) return "";
+        int start = o;
+        while (o < end && data[o] != 0)
+            o++;
+        string value = Encoding.UTF8.GetString(data, start, o - start);
+        if (o < end)
+            o++;
+        return value;
+    }
+
+    private static string DirectReadFixedString(byte[] data, int o, int maxLen)
+    {
+        int len = 0;
+        while (len < maxLen && o + len < data.Length && data[o + len] != 0)
+            len++;
+        return Encoding.UTF8.GetString(data, o, len);
+    }
+
     private System.Collections.IEnumerator ConnectCoroutine()
     {
         m_receivedFrameSinceConnect = false;
 
-        // --- 메인 스레드: 주소/모드 파싱 (Unity API 미사용, 즉시 완료) ---
+        // --- 硫붿씤 ?ㅻ젅?? 二쇱냼/紐⑤뱶 ?뚯떛 (Unity API 誘몄궗?? 利됱떆 ?꾨즺) ---
         IPAddress serverAddr;
         IPAddress localAddr;
+        IPAddress multicastAddr = null;
+        UInt16 commandPort;
+        UInt16 dataPort;
         NatNetConnectionType connType;
         try
         {
             serverAddr = IPAddress.Parse( ServerAddress );
+            commandPort = (UInt16)Mathf.Clamp( CommandPort, 1, 65535 );
+            dataPort = (UInt16)Mathf.Clamp( DataPort, 1, 65535 );
+            if ( !string.IsNullOrWhiteSpace( MulticastAddress ) )
+                multicastAddr = IPAddress.Parse( MulticastAddress.Trim() );
             localAddr = ResolveLocalAddress( serverAddr );
             ResolvedLocalAddress = localAddr.ToString();
             connType = ConnectionType == ClientConnectionType.Unicast
@@ -1791,14 +2858,41 @@ public class OptitrackStreamingClient : MonoBehaviour
         catch ( Exception ex )
         {
             Debug.LogException( ex, this );
-            Debug.LogError( GetType().FullName + ": Error connecting to server; check your configuration, and make sure the server is currently streaming.", this );
+            Debug.LogError( GetType().FullName + ": Error parsing connection settings. Server=" + ServerAddress + ", command=" + CommandPort + ", data=" + DataPort + ", multicast=" + MulticastAddress + ".", this );
             yield break;
         }
 
-        // --- 백그라운드 스레드: 블로킹 네이티브 연결 + SetProperty ---
-        // NatNet_Client_Connect 는 서버가 즉시 응답하지 않으면 내부 타임아웃까지 블로킹된다.
-        // 코루틴은 메인 스레드에서 실행되므로 여기서 직접 호출하면 매 재접속마다 화면이 멈춘다.
-        // Task 로 분리하고 메인 스레드는 매 프레임 양보(yield)하며 완료를 폴링한다.
+        if (ConnectionType == ClientConnectionType.Multicast)
+        {
+            IPAddress directMulticastAddr = multicastAddr ?? IPAddress.Parse("239.255.42.99");
+            if (!ConnectDirectNatNet(serverAddr, localAddr, commandPort, dataPort, directMulticastAddr))
+            {
+                Debug.LogError(GetType().FullName + ": Error connecting to direct NatNet server. Server=" + ServerAddress + ", local=" + localAddr + ", command=" + commandPort + ", data=" + dataPort + ", multicast=" + directMulticastAddr + ". Check Motive streaming, firewall, and network interface.", this);
+                yield break;
+            }
+
+            if (m_replayConnectCoroutine != null)
+            {
+                StopCoroutine(m_replayConnectCoroutine);
+                m_replayConnectCoroutine = null;
+                CleanupReplayClient();
+            }
+
+            if (RecordOnPlay && !m_isReconnecting)
+                Debug.LogWarning(GetType().FullName + ": RecordOnPlay requires the NatNet SDK command path and is skipped in direct multicast mode.", this);
+
+            m_connectionHealthCoroutine = StartCoroutine(CheckConnectionHealth());
+            yield break;
+        }
+
+        Debug.LogError(GetType().FullName + ": Unicast/NatNet SDK connection is disabled. This project now uses the direct UDP multicast NatNet path only.", this);
+        yield break;
+
+#pragma warning disable 162
+        // --- 諛깃렇?쇱슫???ㅻ젅?? 釉붾줈???ㅼ씠?곕툕 ?곌껐 + SetProperty ---
+        // NatNet_Client_Connect ???쒕쾭媛€ 利됱떆 ?묐떟?섏? ?딆쑝硫??대? ?€?꾩븘?껉퉴吏€ 釉붾줈?밸맂??
+        // 肄붾（?댁? 硫붿씤 ?ㅻ젅?쒖뿉???ㅽ뻾?섎?濡??ш린??吏곸젒 ?몄텧?섎㈃ 留??ъ젒?띾쭏???붾㈃??硫덉텣??
+        // Task 濡?遺꾨━?섍퀬 硫붿씤 ?ㅻ젅?쒕뒗 留??꾨젅???묐낫(yield)?섎ʼn ?꾨즺瑜??대쭅?쒕떎.
         bool applyServerSettings = !m_hasAppliedServerSettings;
         NatNetClient connectedClient = null;
         Exception connectError = null;
@@ -1809,9 +2903,18 @@ public class OptitrackStreamingClient : MonoBehaviour
             try
             {
                 c = new NatNetClient();
-                c.Connect( connType, localAddr, serverAddr );
+                if (commandPort == k_DefaultNatNetCommandPort &&
+                    dataPort == k_DefaultNatNetDataPort &&
+                    multicastAddr == null)
+                {
+                    c.Connect( connType, localAddr, serverAddr );
+                }
+                else
+                {
+                    c.Connect( connType, localAddr, serverAddr, commandPort, dataPort, multicastAddr );
+                }
 
-                // SetProperty는 최초 연결에서만 전송 — 재연결 시 Motive 글로벌 설정 반복 변경 방지
+                // SetProperty??理쒖큹 ?곌껐?먯꽌留??꾩넚 ???ъ뿰寃???Motive 湲€濡쒕쾶 ?ㅼ젙 諛섎났 蹂€寃?諛⑹?
                 if ( applyServerSettings )
                 {
                     // Remotely change the Skeleton Coordinate property to Global/Local
@@ -1838,7 +2941,7 @@ public class OptitrackStreamingClient : MonoBehaviour
             }
         } );
 
-        // 메인 스레드는 매 프레임 양보하며 연결 완료를 대기 → 렌더링/입력이 멈추지 않음
+        // 硫붿씤 ?ㅻ젅?쒕뒗 留??꾨젅???묐낫?섎ʼn ?곌껐 ?꾨즺瑜??€湲????뚮뜑留??낅젰??硫덉텛吏€ ?딆쓬
         while ( !connectTask.IsCompleted )
             yield return null;
 
@@ -1846,7 +2949,7 @@ public class OptitrackStreamingClient : MonoBehaviour
         {
             if ( connectError != null )
                 Debug.LogException( connectError, this );
-            Debug.LogError( GetType().FullName + ": Error connecting to server; check your configuration, and make sure the server is currently streaming.", this );
+            Debug.LogError( GetType().FullName + ": Error connecting to NatNet server. Server=" + ServerAddress + ", local=" + localAddr + ", command=" + commandPort + ", data=" + dataPort + ", multicast=" + (multicastAddr != null ? multicastAddr.ToString() : "default") + ". Check Motive streaming, firewall, and network interface.", this );
             yield break;
         }
 
@@ -1854,9 +2957,9 @@ public class OptitrackStreamingClient : MonoBehaviour
         if ( applyServerSettings )
             m_hasAppliedServerSettings = true;
         else
-            Debug.Log(GetType().FullName + ": 재연결 — SetProperty 명령 스킵 (최초 연결에서 이미 적용됨).", this);
+            Debug.Log(GetType().FullName + ": reconnect skipped SetProperty commands; they were already applied on the first connection.", this);
 
-        // SetProperty 명령이 서버에 적용될 때까지 대기 (재연결 시 SetProperty 스킵했으면 대기 불필요)
+        // SetProperty 紐낅졊???쒕쾭???곸슜???뚭퉴吏€ ?€湲?(?ъ뿰寃???SetProperty ?ㅽ궢?덉쑝硫??€湲?遺덊븘??
         if (!m_isReconnecting)
             yield return new UnityEngine.WaitForSeconds( 0.1f );
 
@@ -1883,29 +2986,34 @@ public class OptitrackStreamingClient : MonoBehaviour
                 SubscribeTMarkMarkers();
         }
 
-        // 재연결 중에는 녹화 시작 스킵 — Motive의 Take 파일 반복 열기/닫기 방지
+        // ?ъ뿰寃?以묒뿉???뱁솕 ?쒖옉 ?ㅽ궢 ??Motive??Take ?뚯씪 諛섎났 ?닿린/?リ린 諛⑹?
         if (RecordOnPlay && !m_isReconnecting)
             StartRecording();
 
         byte[] NatNetVersion = m_client.ServerDescription.NatNetVersion;
         ServerNatNetVersion = NatNetVersion[0] + "." + NatNetVersion[1] + "." + NatNetVersion[2] + "." + NatNetVersion[3];
         ClientNatNetVersion = "" + NatNetClient.NatNetLibVersion;
+        Debug.Log(GetType().FullName + ": Connected to NatNet server. Server=" + ServerAddress + ", local=" + ResolvedLocalAddress + ", serverNatNet=" + ServerNatNetVersion + ", clientNatNet=" + ClientNatNetVersion + ", connection=" + ConnectionType + ".", this);
 
         m_client.NativeFrameReceived += OnNatNetFrameReceived;
         m_connectionHealthCoroutine = StartCoroutine( CheckConnectionHealth() );
+#pragma warning restore 162
     }
 
-
     /// <summary>
     /// Disconnects from the streaming server and cleans up <see cref="m_client"/>.
     /// </summary>
     void OnDisable()
     {
-        // ConnectCoroutine 포함 모든 코루틴 정지
+        // ConnectCoroutine ?ы븿 紐⑤뱺 肄붾（???뺤?
         StopAllCoroutines();
+        StopDirectFrameReceiver();
         m_connectionHealthCoroutine = null;
+        m_replayConnectCoroutine = null;
         m_isReconnecting = false;
 
+        CleanupReplayClient();
+
         if (m_client != null)
         {
             if (RecordOnPlay)
@@ -1918,7 +3026,6 @@ public class OptitrackStreamingClient : MonoBehaviour
         }
     }
 
-
     System.Collections.IEnumerator CheckConnectionHealth()
     {
         const float kHealthCheckIntervalSeconds = 1.0f;
@@ -1943,7 +3050,10 @@ public class OptitrackStreamingClient : MonoBehaviour
                 {
                     if ( warnedPendingFirstFrame == false )
                     {
-                        Debug.LogWarning( GetType().FullName + ": No frames received from the server yet. Verify your connection settings are correct and that the server is streaming.", this );
+                        if (m_directNatNetConnected)
+                            Debug.LogWarning( GetType().FullName + ": Direct NatNet receiver is running but no frames have arrived in Unity yet. Check Unity Editor firewall permission, multicast routing, or temporarily disable separate NatNetDeviceListener objects.", this );
+                        else
+                            Debug.LogWarning( GetType().FullName + ": No frames received from the server yet. Verify your connection settings are correct and that the server is streaming.", this );
                         warnedPendingFirstFrame = true;
                     }
 
@@ -1970,9 +3080,9 @@ public class OptitrackStreamingClient : MonoBehaviour
                     Debug.LogWarning( GetType().FullName + ": No streaming frames received from the server recently.", this );
                     if ( AutoReconnect )
                     {
-                        Debug.Log( GetType().FullName + ": 자동 재연결을 시작합니다...", this );
+                        Debug.Log( GetType().FullName + ": starting automatic reconnect.", this );
                         Reconnect();
-                        // OnDisable() → StopAllCoroutines() 로 이 코루틴은 다음 yield 에서 중지됨
+                        // OnDisable() ??StopAllCoroutines() 濡???肄붾（?댁? ?ㅼ쓬 yield ?먯꽌 以묒???
                     }
                     continue;
                 }
@@ -1980,7 +3090,6 @@ public class OptitrackStreamingClient : MonoBehaviour
         }
     }
 
-
 #region Private methods
     /// <summary>
     /// Event handler for NatNet frame delivery. Updates our simplified state representations.
@@ -1996,9 +3105,15 @@ public class OptitrackStreamingClient : MonoBehaviour
     /// <param name="eventArgs"></param>
     private void OnNatNetFrameReceived( object sender, NatNetClient.NativeFrameReceivedEventArgs eventArgs )
     {
-        // 경합 시 최대 1ms 대기 후 드롭.
-        // FillBoneSnapshot의 락 보유 시간이 ~0.1ms이므로 정상 상황에서는 드롭 없음.
-        // GC Pause 등 1ms 초과 상황에서만 드롭 (허용 가능).
+        bool isReplayFrame = ReferenceEquals(sender, m_replayClient);
+        if (!isReplayFrame && IsReplayFrameFresh())
+        {
+            return;
+        }
+
+        // 寃쏀빀 ??理쒕? 1ms ?€湲????쒕∼.
+        // FillBoneSnapshot????蹂댁쑀 ?쒓컙??~0.1ms?대?濡??뺤긽 ?곹솴?먯꽌???쒕∼ ?놁쓬.
+        // GC Pause ??1ms 珥덇낵 ?곹솴?먯꽌留??쒕∼ (?덉슜 媛€??.
         if ( ! Monitor.TryEnter( m_frameDataUpdateLock, 1 ) )
         {
             return;
@@ -2007,8 +3122,13 @@ public class OptitrackStreamingClient : MonoBehaviour
         try
         {
             // Update health markers.
-            m_receivedFrameSinceConnect = true;
             OptitrackHiResTimer.Timestamp frameTimestamp = OptitrackHiResTimer.Now();
+            if (isReplayFrame)
+            {
+                m_replayReceivedFrameSinceConnect = true;
+                Interlocked.Exchange(ref m_lastReplayFrameDeliveryTimestamp.m_ticks, frameTimestamp.m_ticks);
+            }
+            m_receivedFrameSinceConnect = true;
             Interlocked.Exchange( ref m_lastFrameDeliveryTimestamp.m_ticks, frameTimestamp.m_ticks );
 
             // Process received frame.
@@ -2045,7 +3165,6 @@ public class OptitrackStreamingClient : MonoBehaviour
                 RigidBodyDataToState(rbData, OptitrackHiResTimer.Now(), rbState);
             }
 
-
             // ----------------------
             // - Update skeletons
             // ----------------------
@@ -2067,23 +3186,23 @@ public class OptitrackStreamingClient : MonoBehaviour
                 result = NaturalPoint.NatNetLib.NativeMethods.NatNet_Frame_Skeleton_GetRigidBodyCount( pFrame, skelIdx, out skelRbCount );
                 NatNetException.ThrowIfNotOK( result, "NatNet_Frame_Skeleton_GetRigidBodyCount failed." );
 
-                // 스켈레톤 정의 검색을 본 루프 밖에서 1회만 수행 (기존: 매 본마다 선형 탐색)
+                // ?ㅼ펷?덊넠 ?뺤쓽 寃€?됱쓣 蹂?猷⑦봽 諛뽰뿉??1?뚮쭔 ?섑뻾 (湲곗〈: 留?蹂몃쭏???좏삎 ?먯깋)
                 OptitrackSkeletonDefinition skelDef = GetSkeletonDefinitionById(skeletonId);
                 if (skelDef == null)
                 {
-                    // Motive에서 중간에 스켈레톤이 생성된 경우 — 메인 스레드에서 정의 재조회 예약 (중복 로그 방지)
+                    // Motive?먯꽌 以묎컙???ㅼ펷?덊넠???앹꽦??寃쎌슦 ??硫붿씤 ?ㅻ젅?쒖뿉???뺤쓽 ?ъ“???덉빟 (以묐났 濡쒓렇 諛⑹?)
                     if (!m_pendingDefinitionRefresh && m_definitionRefreshCount < k_MaxAutoDefinitionRefreshes)
                     {
-                        Debug.LogWarning(GetType().FullName + ": 알 수 없는 스켈레톤 ID " + skeletonId + " — 정의 재조회 예약됨.", this);
+                        Debug.LogWarning(GetType().FullName + ": missing skeleton definition for streamed skeleton ID " + skeletonId + "; scheduling definition refresh.", this);
                         m_pendingDefinitionRefresh = true;
                     }
                     continue;
                 }
 
-                // === 스켈레톤 프레임 필터 (EnableSkeletonFrameFilter) ===
-                // Motive가 빈/부분 스켈레톤 페이로드를 내보낼 수 있다.
-                //   ON : 본 개수가 다르면 프레임 전체 폐기 (직전 포즈 유지 → 떨림/부분프레임 방지)
-                //   OFF: 들어온 본 개수만큼 그대로 처리 (모션 끊김 방지)
+                // === ?ㅼ펷?덊넠 ?꾨젅???꾪꽣 (EnableSkeletonFrameFilter) ===
+                // Motive媛€ 鍮?遺€遺??ㅼ펷?덊넠 ?섏씠濡쒕뱶瑜??대낫?????덈떎.
+                //   ON : 蹂?媛쒖닔媛€ ?ㅻⅤ硫??꾨젅???꾩껜 ?먭린 (吏곸쟾 ?ъ쫰 ?좎? ???⑤┝/遺€遺꾪봽?덉엫 諛⑹?)
+                //   OFF: ?ㅼ뼱??蹂?媛쒖닔留뚰겮 洹몃?濡?泥섎━ (紐⑥뀡 ?딄? 諛⑹?)
                 if (EnableSkeletonFrameFilter && skelRbCount != skelDef.Bones.Count)
                 {
                     continue;
@@ -2096,7 +3215,7 @@ public class OptitrackStreamingClient : MonoBehaviour
                     NatNetException.ThrowIfNotOK( result, "NatNet_Frame_Skeleton_GetRigidBody failed." );
                 }
 
-                // ON 일 때만: 본 하나라도 트래킹 실패/손상이면 프레임 전체 폐기
+                // ON ???뚮쭔: 蹂??섎굹?쇰룄 ?몃옒???ㅽ뙣/?먯긽?대㈃ ?꾨젅???꾩껜 ?먭린
                 if (EnableSkeletonFrameFilter)
                 {
                     bool isValidSkeletonFrame = true;
@@ -2124,8 +3243,8 @@ public class OptitrackStreamingClient : MonoBehaviour
                     }
                 }
 
-                // === 글로벌 트랜스폼 커밋 ===
-                // 필터 OFF 에서도 손상(NaN·0쿼터니언)·미매핑 본은 개별로 건너뛰어 직전 포즈를 보존한다.
+                // === 湲€濡쒕쾶 ?몃옖?ㅽ뤌 而ㅻ컠 ===
+                // ?꾪꽣 OFF ?먯꽌???먯긽(NaN쨌0荑쇳꽣?덉뼵)쨌誘몃ℓ??蹂몄? 媛쒕퀎濡?嫄대꼫?곗뼱 吏곸쟾 ?ъ쫰瑜?蹂댁〈?쒕떎.
                 for (int boneIdx = 0; boneIdx < skelRbCount; ++boneIdx)
                 {
                     sRigidBodyData boneData = stagedBones[boneIdx];
@@ -2178,8 +3297,8 @@ public class OptitrackStreamingClient : MonoBehaviour
             // -----------------------------------------------------
             // - Update trained markerset // trained markerset added
             // ----------------------------------------------------
-            // m_dataDescs를 로컬 변수로 캡처: UpdateDefinitions()(메인 스레드)가 참조를 교체해도 안전
-            // null 체크: SkipDataDescriptions=true 또는 UpdateDefinitions() 미완료/실패 시 크래시 방지
+            // m_dataDescs瑜?濡쒖뺄 蹂€?섎줈 罹≪쿂: UpdateDefinitions()(硫붿씤 ?ㅻ젅??媛€ 李몄“瑜?援먯껜?대룄 ?덉쟾
+            // null 泥댄겕: SkipDataDescriptions=true ?먮뒗 UpdateDefinitions() 誘몄셿猷??ㅽ뙣 ???щ옒??諛⑹?
             var dataDescsSnapshot = m_dataDescs;
             m_latestTMarkMarkerStates.Clear();
             if (dataDescsSnapshot != null && dataDescsSnapshot.AssetDescriptions != null)
@@ -2190,7 +3309,7 @@ public class OptitrackStreamingClient : MonoBehaviour
                 // Ensure we have a state corresponding to this tmarkerset ID.
                 OptitrackTMarkersetState tmarkState = GetOrCreateTMarkersetState(tmarkersetId);
 
-                // TMarkerset 정의 검색을 본 루프 밖에서 1회만 수행 (기존: 매 본마다 선형 탐색)
+                // TMarkerset ?뺤쓽 寃€?됱쓣 蹂?猷⑦봽 諛뽰뿉??1?뚮쭔 ?섑뻾 (湲곗〈: 留?蹂몃쭏???좏삎 ?먯깋)
                 Int32 tmarkRbCount = dataDescsSnapshot.AssetDescriptions[tmarkIdx].RigidBodyCount;
                 OptitrackTMarkersetDefinition tmarkDef = GetTMarkersetDefinitionById(tmarkersetId);
                 if (tmarkDef == null)
@@ -2293,7 +3412,7 @@ public class OptitrackStreamingClient : MonoBehaviour
             // ----------------------------------
             // - Update analog devices (iFacialMocap face, NIDAQ, etc.)
             //
-            //   We CANNOT use eventArgs.MarshaledFrame here — that triggers a full
+            //   We CANNOT use eventArgs.MarshaledFrame here ??that triggers a full
             //   sFrameOfMocapData marshal which throws on the fixed-size MarkerSets[]
             //   array (uninitialized bytes in unused slots fail ANSI string decoding).
             //
@@ -2319,9 +3438,8 @@ public class OptitrackStreamingClient : MonoBehaviour
         }
     }
 
-
     // Cached struct offsets/sizes for ProcessDeviceData. Computed once via reflection,
-    // then reused — Marshal.OffsetOf / SizeOf don't allocate on subsequent calls.
+    // then reused ??Marshal.OffsetOf / SizeOf don't allocate on subsequent calls.
     private static int s_DeviceCountOffset = -1;
     private static int s_DevicesArrayOffset;
     private static int s_DeviceDataSize;
@@ -2344,7 +3462,7 @@ public class OptitrackStreamingClient : MonoBehaviour
         int deviceCount = Marshal.ReadInt32(pFrame, s_DeviceCountOffset);
 
         if (deviceCount <= 0) return;
-        if (deviceCount > NatNetConstants.MaxDevices) deviceCount = NatNetConstants.MaxDevices;
+        if (deviceCount > k_MaxNatNetDevices) deviceCount = k_MaxNatNetDevices;
 
         int frameNumber = Marshal.ReadInt32(pFrame, s_FrameNumberOffset);
 
@@ -2366,7 +3484,7 @@ public class OptitrackStreamingClient : MonoBehaviour
             chCount = Math.Min(chCount, devDef.ChannelNames != null ? devDef.ChannelNames.Count : 0);
             for (int ch = 0; ch < chCount; ++ch)
             {
-                // Use subframe 0 — face data is one sample per frame.
+                // Use subframe 0 ??face data is one sample per frame.
                 sAnalogChannelData chData = devData.ChannelData[ch];
                 if (chData.Values == null || chData.Values.Length == 0)
                     continue;
@@ -2376,7 +3494,6 @@ public class OptitrackStreamingClient : MonoBehaviour
         }
     }
 
-
     private OptitrackDeviceDefinition GetDeviceDefinitionById( Int32 id )
     {
         for (int i = 0; i < m_deviceDefinitions.Count; ++i)
@@ -2397,7 +3514,6 @@ public class OptitrackStreamingClient : MonoBehaviour
         return state;
     }
 
-
     /// <summary>Get the latest channel values for a device by ID.</summary>
     public OptitrackDeviceState GetLatestDeviceState( Int32 deviceId )
     {
@@ -2412,7 +3528,6 @@ public class OptitrackStreamingClient : MonoBehaviour
         }
     }
 
-
     /// <summary>Get the latest channel values for a device by Motive name (e.g. "iFacialMocap_40001").</summary>
     public OptitrackDeviceState GetLatestDeviceState( string deviceName )
     {
@@ -2441,10 +3556,24 @@ public class OptitrackStreamingClient : MonoBehaviour
             Name = source.Name,
             FrameNumber = source.FrameNumber,
             DeliveryTimestamp = source.DeliveryTimestamp,
-            ChannelValues = new Dictionary<string, float>(source.ChannelValues),
+            ChannelValues = source.ChannelValues != null
+                ? new Dictionary<string, float>(source.ChannelValues)
+                : new Dictionary<string, float>(),
         };
     }
 
+    /// <summary>Returns snapshots of all latest NatNet device samples, including direct UDP fallback devices without MODELDEF names.</summary>
+    public List<OptitrackDeviceState> GetLatestDeviceStates()
+    {
+        lock (m_frameDataUpdateLock)
+        {
+            var snapshots = new List<OptitrackDeviceState>(m_latestDeviceStates.Count);
+            foreach (var kvp in m_latestDeviceStates)
+                snapshots.Add(CopyDeviceState(kvp.Value));
+            return snapshots;
+        }
+    }
+
     /// <summary>Copies a device's latest channel values into a caller-owned dictionary.</summary>
     public bool FillDeviceChannelSnapshot(string deviceName, Dictionary<string, float> channelValuesOut)
     {
@@ -2462,7 +3591,6 @@ public class OptitrackStreamingClient : MonoBehaviour
         }
     }
 
-
     /// <summary>Returns a snapshot of currently registered device definitions.</summary>
     public List<OptitrackDeviceDefinition> GetDeviceDefinitions()
     {
@@ -2482,7 +3610,7 @@ public class OptitrackStreamingClient : MonoBehaviour
         int assetID = marker.Id >> 16; // high word = Asset ID Number
         int memberID = marker.Id & 0x00ffff; // low word = Member ID Number (constraint number)
 
-        // assetID→이름 캐시 사용 (기존: 매 마커마다 3개 리스트 선형 탐색)
+        // assetID?믪씠由?罹먯떆 ?ъ슜 (湲곗〈: 留?留덉빱留덈떎 3媛?由ъ뒪???좏삎 ?먯깋)
         string assetName;
         if (!m_assetIdToNameCache.TryGetValue(assetID, out assetName))
         {
@@ -2531,11 +3659,10 @@ public class OptitrackStreamingClient : MonoBehaviour
 
     private void ResetStreamingSubscriptions()
     {
-        // 1개 명령으로 통합: "SubscribeToData"는 모든 필터를 클리어하고 기본 상태(구독 없음)로 리셋
+        // 1媛?紐낅졊?쇰줈 ?듯빀: "SubscribeToData"??紐⑤뱺 ?꾪꽣瑜??대━?댄븯怨?湲곕낯 ?곹깭(援щ룆 ?놁쓬)濡?由ъ뀑
         m_client.RequestCommand( "SubscribeToData" );
     }
 
-
     private void SubscribeRigidBody( MonoBehaviour component, Int32 rigidBodyId )
     {
         if ( m_client != null && ConnectionType == ClientConnectionType.Unicast )
@@ -2735,7 +3862,7 @@ public class OptitrackStreamingClient : MonoBehaviour
         {
             using (var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
             {
-                socket.Connect(new IPEndPoint(serverAddress, NatNetConstants.DefaultCommandPort));
+                socket.Connect(new IPEndPoint(serverAddress, Mathf.Clamp(CommandPort, 1, 65535)));
                 if (socket.LocalEndPoint is IPEndPoint endpoint &&
                     endpoint.Address.AddressFamily == AddressFamily.InterNetwork &&
                     !IPAddress.Any.Equals(endpoint.Address))
@@ -2747,7 +3874,7 @@ public class OptitrackStreamingClient : MonoBehaviour
         }
         catch (Exception ex)
         {
-            Debug.LogWarning(GetType().FullName + ": 로컬 주소 자동 탐지 실패. LocalAddress fallback을 사용합니다. " + ex.Message, this);
+            Debug.LogWarning(GetType().FullName + ": failed to auto-detect local address. Falling back to LocalAddress. " + ex.Message, this);
         }
 
         return IPAddress.Parse(LocalAddress);
@@ -2763,15 +3890,15 @@ public class OptitrackStreamingClient : MonoBehaviour
         return scratch;
     }
 
-    /// <summary>Motive "이 프레임 트래킹됨" 비트(0x01). 엄격 필터(ON)에서만 프레임 폐기 조건으로 쓰인다.</summary>
+    /// <summary>Motive "???꾨젅???몃옒?밸맖" 鍮꾪듃(0x01). ?꾧꺽 ?꾪꽣(ON)?먯꽌留??꾨젅???먭린 議곌굔?쇰줈 ?곗씤??</summary>
     private static bool IsSkeletonBoneTracked(sRigidBodyData boneData)
     {
         return (boneData.Params & 0x01) != 0;
     }
 
     /// <summary>
-    /// 본 데이터가 포즈로 커밋해도 안전한지 검사한다(좌표 유한 + 쿼터니언 정상).
-    /// 트래킹 비트와 무관 — 필터 OFF에서도 손상 본이 직전 포즈를 덮어쓰지 못하게 막는 안전장치.
+    /// 蹂??곗씠?곌? ?ъ쫰濡?而ㅻ컠?대룄 ?덉쟾?쒖? 寃€?ы븳??醫뚰몴 ?좏븳 + 荑쇳꽣?덉뼵 ?뺤긽).
+    /// ?몃옒??鍮꾪듃?€ 臾닿? ???꾪꽣 OFF?먯꽌???먯긽 蹂몄씠 吏곸쟾 ?ъ쫰瑜???뼱?곗? 紐삵븯寃?留됰뒗 ?덉쟾?μ튂.
     /// </summary>
     private static bool IsBoneDataUsable(sRigidBodyData boneData)
     {
@@ -2792,9 +3919,9 @@ public class OptitrackStreamingClient : MonoBehaviour
     }
 
     /// <summary>
-    /// 프레임 본 데이터가 이 스켈레톤에 커밋 가능한지 검사하고 boneId를 출력한다.
-    /// 스켈레톤 ID 일치 + 정의에 매핑된 본 + 데이터 정상(NaN/0-쿼터니언 아님)일 때만 true.
-    /// (필터 ON/OFF 공통으로 커밋 단계에서 사용 — OFF에서 손상·미매핑 본 개별 스킵, 2차 패스 KeyNotFound 방지)
+    /// ?꾨젅??蹂??곗씠?곌? ???ㅼ펷?덊넠??而ㅻ컠 媛€?ν븳吏€ 寃€?ы븯怨?boneId瑜?異쒕젰?쒕떎.
+    /// ?ㅼ펷?덊넠 ID ?쇱튂 + ?뺤쓽??留ㅽ븨??蹂?+ ?곗씠???뺤긽(NaN/0-荑쇳꽣?덉뼵 ?꾨떂)???뚮쭔 true.
+    /// (?꾪꽣 ON/OFF 怨듯넻?쇰줈 而ㅻ컠 ?④퀎?먯꽌 ?ъ슜 ??OFF?먯꽌 ?먯긽쨌誘몃ℓ??蹂?媛쒕퀎 ?ㅽ궢, 2李??⑥뒪 KeyNotFound 諛⑹?)
     /// </summary>
     private static bool TryGetCommittableBoneId(sRigidBodyData boneData, Int32 skeletonId, OptitrackSkeletonDefinition skelDef, out int boneId)
     {
@@ -2839,7 +3966,6 @@ public class OptitrackStreamingClient : MonoBehaviour
         return returnedState;
     }
 
-
     /// <summary>
     /// Returns the <see cref="OptitrackSkeletonState"/> corresponding to the provided <paramref name="skeletonId"/>.
     /// If the requested state object does not exist yet, it will initialize and return a newly-created one.
@@ -2955,21 +4081,20 @@ public class OptitrackStreamingClient : MonoBehaviour
         return returnedState;
     }
 
-
     /// <summary>
-    /// 내부 프레임 데이터 락 진입. 반드시 try-finally 패턴으로 _ExitFrameDataUpdateLock()과 쌍으로 사용하세요.
-    /// Exit 없이 호출하면 NatNet 스레드가 영구 데드락됩니다.
+    /// ?대? ?꾨젅???곗씠????吏꾩엯. 諛섎뱶??try-finally ?⑦꽩?쇰줈 _ExitFrameDataUpdateLock()怨??띿쑝濡??ъ슜?섏꽭??
+    /// Exit ?놁씠 ?몄텧?섎㈃ NatNet ?ㅻ젅?쒓? ?곴뎄 ?곕뱶?쎈맗?덈떎.
     /// </summary>
-    [System.Obsolete("직접 락 조작 대신 FillBoneSnapshot() 등 스레드 안전 API를 사용하세요.")]
+    [System.Obsolete("吏곸젒 ??議곗옉 ?€??FillBoneSnapshot() ???ㅻ젅???덉쟾 API瑜??ъ슜?섏꽭??")]
     internal void _EnterFrameDataUpdateLock()
     {
         Monitor.Enter( m_frameDataUpdateLock );
     }
 
     /// <summary>
-    /// 내부 프레임 데이터 락 해제. 반드시 _EnterFrameDataUpdateLock()과 쌍으로 사용하세요.
+    /// ?대? ?꾨젅???곗씠?????댁젣. 諛섎뱶??_EnterFrameDataUpdateLock()怨??띿쑝濡??ъ슜?섏꽭??
     /// </summary>
-    [System.Obsolete("직접 락 조작 대신 FillBoneSnapshot() 등 스레드 안전 API를 사용하세요.")]
+    [System.Obsolete("吏곸젒 ??議곗옉 ?€??FillBoneSnapshot() ???ㅻ젅???덉쟾 API瑜??ъ슜?섏꽭??")]
     internal void _ExitFrameDataUpdateLock()
     {
         Monitor.Exit( m_frameDataUpdateLock );
diff --git a/Assets/External/StreamingleFacial/NatnetDeviceListener.cs b/Assets/External/StreamingleFacial/NatnetDeviceListener.cs
index cb0bcb3c1..3fd795f64 100644
--- a/Assets/External/StreamingleFacial/NatnetDeviceListener.cs
+++ b/Assets/External/StreamingleFacial/NatnetDeviceListener.cs
@@ -1,281 +1,17 @@
-//======================================================================================================
-// NatnetDeviceListener
-//
-// Joins NatNet's multicast data stream and parses the WIRE format directly to extract
-// analog device frame data. Bypasses OptitrackStreamingClient's wrapper struct (which
-// can't read device data correctly because the C# struct layout doesn't match what
-// the native NatNet DLL fills into the pFrame buffer for plugin-registered devices).
-//
-// Verified: Motive DOES broadcast plugin device data via NatNet (both live and playback);
-// the existing wrapper just can't read it. This listener confirms by parsing wire bytes
-// directly.
-//
-// Wire format (NatNet 4.x) per section: int32 count, int32 sectionSize, then `sectionSize`
-// bytes of section payload. We walk past markerSets, otherMarkers, rigidBodies, skeletons,
-// assets, labeledMarkers, forcePlates, then read devices.
-//======================================================================================================
-
-using System;
-using System.Collections.Generic;
-using System.Net;
-using System.Net.Sockets;
-using System.Threading;
 using UnityEngine;
 
+/// <summary>
+/// Legacy compatibility component.
+/// NatNet device channels are now parsed directly by OptitrackStreamingClient.
+/// This stub keeps old scenes/prefabs from producing missing-script references.
+/// </summary>
 public class NatnetDeviceListener : MonoBehaviour
 {
-    // ----------------------- Singleton -----------------------
-    // Only one NatnetDeviceListener is needed per scene (multicast — single subscription
-    // serves all consumers). Use NatnetDeviceListener.Instance to access; auto-creates
-    // on first access if not already in scene.
+    [Header("Legacy")]
+    [Tooltip("Deprecated. OptitrackStreamingClient now parses NatNet device channels directly.")]
+    public bool disabledByUnifiedOptitrackClient = true;
 
-    private static NatnetDeviceListener _instance;
-
-    public static NatnetDeviceListener Instance
-    {
-        get
-        {
-            if (_instance != null) return _instance;
-            _instance = FindObjectOfType<NatnetDeviceListener>();
-            if (_instance == null)
-            {
-                var go = new GameObject("NatnetDeviceListener");
-                _instance = go.AddComponent<NatnetDeviceListener>();
-            }
-            return _instance;
-        }
-    }
-
-    void Awake()
-    {
-        if (_instance != null && _instance != this)
-        {
-            Debug.LogWarning($"[NatnetDeviceListener] Duplicate instance on '{gameObject.name}' — destroying. Use NatnetDeviceListener.Instance.", gameObject);
-            Destroy(this);
-            return;
-        }
-        _instance = this;
-    }
-
-    [Header("NatNet Multicast Settings")]
-    [Tooltip("Default Motive multicast group = 239.255.42.99")]
+    [Header("Old Settings (unused)")]
     public string multicastGroup = "239.255.42.99";
-
-    [Tooltip("Default Motive data port = 1511")]
     public int dataPort = 1511;
-
-    [Header("Diagnostics (runtime-only)")]
-    [SerializeField] private int _packetsReceived;
-    [SerializeField] private int _framesWithDevices;
-    [SerializeField] private int _activeDeviceCount;
-    [SerializeField] private int _lastFrameNumber;
-    [SerializeField] private string _lastError = "";
-
-    // Per-device latest channel values, keyed by WIRE INDEX (0, 1, 2, ...) NOT
-    // device ID. Motive empirically assigns ID=0 to all plugin devices, so ID-based
-    // keying causes collision. Wire index = position in NatNet frame's devices array.
-    // Description order assumed to match wire order (Motive sends in registration order).
-    private readonly Dictionary<int, float[]> _deviceChannelsByIndex = new Dictionary<int, float[]>();
-    private readonly Dictionary<int, ulong> _deviceFrameSeqByIndex = new Dictionary<int, ulong>();
-    // Also track id for diagnostics.
-    private readonly Dictionary<int, int> _deviceIdByIndex = new Dictionary<int, int>();
-    private int _wireDeviceCount = 0;
-    private readonly object _stateLock = new object();
-
-    private UdpClient _udp;
-    private Thread _thread;
-    private volatile bool _running;
-
-    void Start()  { StartListener(); }
-    void OnDisable() { StopListener(); }
-    void OnApplicationQuit() { StopListener(); }
-    void OnDestroy()
-    {
-        if (_instance == this) _instance = null;
-        StopListener();
-    }
-
-    void StartListener()
-    {
-        if (_running) return;
-        try
-        {
-            _udp = new UdpClient();
-            _udp.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
-            _udp.Client.Bind(new IPEndPoint(IPAddress.Any, dataPort));
-            // INADDR_ANY interface — let OS pick. Matches the working Python sniffer pattern.
-            _udp.JoinMulticastGroup(IPAddress.Parse(multicastGroup));
-            _udp.Client.ReceiveTimeout = 1000;
-        }
-        catch (Exception e)
-        {
-            _lastError = $"bind/join failed: {e.Message}";
-            Debug.LogError($"[NatnetDeviceListener] {_lastError}", this);
-            return;
-        }
-
-        _running = true;
-        _thread = new Thread(ThreadLoop) { IsBackground = true, Name = "NatnetDeviceListener" };
-        _thread.Start();
-    }
-
-    void StopListener()
-    {
-        _running = false;
-        try { _udp?.Close(); } catch { }
-        _udp = null;
-        if (_thread != null && _thread.IsAlive)
-        {
-            _thread.Join(500);
-            _thread = null;
-        }
-    }
-
-    void ThreadLoop()
-    {
-        var ep = new IPEndPoint(IPAddress.Any, 0);
-        while (_running)
-        {
-            try
-            {
-                byte[] data = _udp.Receive(ref ep);
-                Interlocked.Increment(ref _packetsReceived);
-                ParsePacket(data);
-            }
-            catch (SocketException se)
-            {
-                if (!_running) break;
-                if (se.SocketErrorCode == SocketError.TimedOut) continue;
-                _lastError = $"recv: {se.Message}";
-            }
-            catch (ObjectDisposedException) { break; }
-            catch (Exception e)
-            {
-                _lastError = $"loop: {e.Message}";
-            }
-        }
-    }
-
-    // Walks NatNet 4.x frame data sections (each prefixed with count + sectionSize),
-    // jumps past unknown sections by raw byte count, extracts device data.
-    void ParsePacket(byte[] data)
-    {
-        if (data.Length < 12) return;
-        ushort msgId = BitConverter.ToUInt16(data, 0);
-        if (msgId != 7) return; // NAT_FRAMEOFDATA
-
-        int o = 4;
-        int frameNumber = BitConverter.ToInt32(data, o); o += 4;
-
-        // 7 variable-length sections before Devices, each as [int32 count][int32 sectionSize][bytes...]
-        // Order: markerSets, otherMarkers, rigidBodies, skeletons, assets, labeledMarkers, forcePlates.
-        try
-        {
-            for (int s = 0; s < 7; s++)
-            {
-                if (o + 8 > data.Length) return;
-                /* count */ BitConverter.ToInt32(data, o); o += 4;
-                int sz = BitConverter.ToInt32(data, o); o += 4;
-                o += sz;
-                if (o > data.Length) return;
-            }
-
-            // Devices section
-            if (o + 8 > data.Length) return;
-            int devCnt = BitConverter.ToInt32(data, o); o += 4;
-            int devSz = BitConverter.ToInt32(data, o); o += 4;
-            int devEnd = o + devSz;
-            if (devEnd > data.Length || devCnt < 0 || devCnt > 64) return;
-
-            // Parse each device — store by WIRE INDEX, not device ID.
-            // GC OPT: reuse pre-allocated float[] per wire index. Only realloc when
-            // channel count changes (rare — only on device re-registration).
-            int activeCount = 0;
-            for (int d = 0; d < devCnt; d++)
-            {
-                if (o + 8 > devEnd) break;
-                int devId = BitConverter.ToInt32(data, o); o += 4;
-                int nCh = BitConverter.ToInt32(data, o); o += 4;
-                if (nCh < 0 || nCh > 1024) break;
-
-                // Reuse existing buffer if size matches; else allocate new (GC opt).
-                // Stale detection moved to plugin-side (Motive Devices Panel state).
-                float[] vals;
-                _deviceChannelsByIndex.TryGetValue(d, out vals);
-                if (vals == null || vals.Length != nCh)
-                    vals = new float[nCh];
-
-                bool ok = true;
-                for (int c = 0; c < nCh; c++)
-                {
-                    if (o + 4 > devEnd) { ok = false; break; }
-                    int nFr = BitConverter.ToInt32(data, o); o += 4;
-                    vals[c] = (nFr > 0 && o + 4 <= devEnd) ? BitConverter.ToSingle(data, o) : 0f;
-                    o += nFr * 4;
-                    if (o > devEnd) { ok = false; break; }
-                }
-                if (!ok) break;
-
-                lock (_stateLock)
-                {
-                    _deviceChannelsByIndex[d] = vals;
-                    _deviceIdByIndex[d] = devId;
-                    _deviceFrameSeqByIndex[d] = _deviceFrameSeqByIndex.TryGetValue(d, out var s2) ? s2 + 1 : 1;
-                }
-                activeCount++;
-            }
-
-            lock (_stateLock) { _wireDeviceCount = activeCount; }
-            _lastFrameNumber = frameNumber;
-            _activeDeviceCount = activeCount;
-            if (activeCount > 0) Interlocked.Increment(ref _framesWithDevices);
-        }
-        catch (Exception e)
-        {
-            _lastError = $"parse: {e.Message}";
-        }
-    }
-
-    // ----------------------- Public API -----------------------
-
-    /// <summary>Returns the latest channel values for a device by WIRE INDEX (0,1,2,...).
-    /// Wire index = position in NatNet frame's devices array, in registration/broadcast order.
-    /// Returns the internal array DIRECTLY (no Clone, no GC alloc). Caller must finish reading
-    /// in one Update tick — values may be overwritten by the NatNet thread otherwise. Acceptable
-    /// for our use (worst case = 1-frame torn read).</summary>
-    public float[] GetDeviceChannelsByIndex(int wireIndex)
-    {
-        lock (_stateLock)
-        {
-            return _deviceChannelsByIndex.TryGetValue(wireIndex, out var arr) ? arr : null;
-        }
-    }
-
-    /// <summary>Snapshot version: copies values into caller-provided buffer under lock.
-    /// Returns number of values copied (or 0 if device not found).
-    /// Use this if you need exact frame consistency without race window.</summary>
-    public int CopyDeviceChannelsByIndex(int wireIndex, float[] dest)
-    {
-        if (dest == null) return 0;
-        lock (_stateLock)
-        {
-            if (!_deviceChannelsByIndex.TryGetValue(wireIndex, out var arr) || arr == null) return 0;
-            int n = Math.Min(arr.Length, dest.Length);
-            Array.Copy(arr, dest, n);
-            return n;
-        }
-    }
-
-    public ulong GetDeviceFrameSeqByIndex(int wireIndex)
-    {
-        lock (_stateLock)
-        {
-            return _deviceFrameSeqByIndex.TryGetValue(wireIndex, out var n) ? n : 0UL;
-        }
-    }
-
-    public int GetWireDeviceCount()
-    {
-        lock (_stateLock) { return _wireDeviceCount; }
-    }
 }
diff --git a/Assets/External/StreamingleFacial/StreamingleFacialReceiver.cs b/Assets/External/StreamingleFacial/StreamingleFacialReceiver.cs
index b243bb16e..be93866fb 100644
--- a/Assets/External/StreamingleFacial/StreamingleFacialReceiver.cs
+++ b/Assets/External/StreamingleFacial/StreamingleFacialReceiver.cs
@@ -36,8 +36,6 @@ public class StreamingleFacialReceiver : MonoBehaviour
 	[Header("NatNet Mode (sourceMode=NatNetDevice일 때)")]
 	[Tooltip("OptitrackStreamingClient. 비워두면 Start에서 자동 검색. (디바이스 이름→ID, 채널 이름 메타데이터용)")]
 	public OptitrackStreamingClient natnetStreamingClient;
-	[Tooltip("NatnetDeviceListener. 비워두면 Start에서 자동 검색하고, 없으면 자동 생성. (실제 채널값을 NatNet wire 직접 파싱으로 가져옴 — wrapper 우회)")]
-	public NatnetDeviceListener natnetDeviceListener;
 	[Tooltip("Motive 디바이스 이름 prefix. 활성 포트가 붙어 최종 base name = prefix + activePort (예: \"iFacialMocap_\" + 40001 = \"iFacialMocap_40001\"). 32채널 초과로 분할되었으면 _A/_B 접미사 자동 감지.")]
 	public string natnetDeviceNamePrefix = "iFacialMocap_";
 
@@ -46,6 +44,24 @@ public class StreamingleFacialReceiver : MonoBehaviour
 	/// </summary>
 	public string EffectiveNatnetDeviceBaseName => natnetDeviceNamePrefix + LOCAL_PORT;
 
+	public void SetNatNetSource(OptitrackStreamingClient client)
+	{
+		if (natnetStreamingClient == client) return;
+		natnetStreamingClient = client;
+		ResetNatNetDeviceResolution();
+	}
+
+	private void ResetNatNetDeviceResolution()
+	{
+		natnetResolvedDevices.Clear();
+		natnetLastResolveAttempt = -10f;
+		natnetLastResolvedFor = "";
+		Array.Clear(natnetLastSeenSeq, 0, natnetLastSeenSeq.Length);
+		natnetDiagLogged = false;
+		messageString = "";
+		lastProcessedMessage = "";
+	}
+
 	// NatNet 모드: device name → (device id, channel names) 캐시.
 	// OptitrackStreamingClient의 description으로부터 1회 lookup.
 	private struct ResolvedDevice
@@ -54,7 +70,7 @@ public class StreamingleFacialReceiver : MonoBehaviour
 		// NatNet 프레임 전체에서의 위치 (description 순서 = wire 순서 가정).
 		// listener는 wire 글로벌 인덱스로 키잉되므로 로컬 리스트 인덱스를 넘기면 안 됨
 		// — 다른 포트의 device 데이터를 잘못 가져오게 됨.
-		public int WireIndex;
+		public string DeviceName;
 		public List<string> ChannelNames;
 	}
 	private List<ResolvedDevice> natnetResolvedDevices = new List<ResolvedDevice>(2);
@@ -252,8 +268,6 @@ public class StreamingleFacialReceiver : MonoBehaviour
 					Debug.LogWarning("[Streamingle] OptitrackStreamingClient.ReceiveDevices 가 꺼져있음 — 켜야 device description이 들어옴.", this);
 				}
 
-				if (natnetDeviceListener == null)
-					natnetDeviceListener = NatnetDeviceListener.Instance;
 			}
 			else if (useSharedPort)
 			{
@@ -438,11 +452,73 @@ public class StreamingleFacialReceiver : MonoBehaviour
 		"tongueOut", "trackingStatus",
 	};
 
+	private static OptitrackDeviceState FindNatNetDeviceState(List<OptitrackDeviceState> states, int id, string name)
+	{
+		if (states == null) return null;
+		for (int i = 0; i < states.Count; i++)
+		{
+			var state = states[i];
+			if (state == null) continue;
+			if (state.Id == id) return state;
+			if (!string.IsNullOrEmpty(name) && state.Name == name) return state;
+		}
+		return null;
+	}
+
+	private static bool TryBuildNatNetDeviceValueArray(OptitrackDeviceState state, out float[] values)
+	{
+		values = null;
+		if (state == null || state.ChannelValues == null || state.ChannelValues.Count == 0)
+			return false;
+
+		int maxChannelIndex = -1;
+		foreach (var key in state.ChannelValues.Keys)
+		{
+			int index;
+			if (TryParseNatNetChannelIndex(key, out index))
+				maxChannelIndex = Mathf.Max(maxChannelIndex, index);
+		}
+
+		if (maxChannelIndex >= 0)
+		{
+			values = new float[maxChannelIndex + 1];
+			foreach (var kvp in state.ChannelValues)
+			{
+				int index;
+				if (TryParseNatNetChannelIndex(kvp.Key, out index) && index >= 0 && index < values.Length)
+					values[index] = kvp.Value;
+			}
+			return true;
+		}
+
+		if (!state.ChannelValues.TryGetValue("sentinelPort", out float sentinel))
+			return false;
+
+		values = new float[1 + kCanonicalBlendshapeNames.Length];
+		values[0] = sentinel;
+		for (int i = 0; i < kCanonicalBlendshapeNames.Length; i++)
+		{
+			float value;
+			if (state.ChannelValues.TryGetValue(kCanonicalBlendshapeNames[i], out value))
+				values[i + 1] = value;
+		}
+		return true;
+	}
+
+	private static bool TryParseNatNetChannelIndex(string key, out int index)
+	{
+		index = -1;
+		if (string.IsNullOrEmpty(key) || !key.StartsWith("Channel", StringComparison.Ordinal))
+			return false;
+		return int.TryParse(key.Substring("Channel".Length), NumberStyles.Integer, CultureInfo.InvariantCulture, out index);
+	}
+
 	void PollNatNetDevice()
 	{
-		if (natnetStreamingClient == null || natnetDeviceListener == null) return;
+		if (natnetStreamingClient == null) return;
 
 		string baseName = EffectiveNatnetDeviceBaseName;
+		var deviceStates = natnetStreamingClient.GetLatestDeviceStates();
 
 		// 포트 변경 또는 정의 미발견 시 재해석. OptitrackStreamingClient의 device descriptions
 		// 에서 우리 base name과 매칭되는 device id + channel names를 캐시.
@@ -462,17 +538,18 @@ public class StreamingleFacialReceiver : MonoBehaviour
 			// 2) 채널 수 큰 게 primary, 작은 게 overflow
 			// 3) ChannelNames 는 canonical 배열에서 슬라이스로 부여
 			int port = LOCAL_PORT;
-			int wireCount = natnetDeviceListener.GetWireDeviceCount();
-			var wireCandidates = new List<(int wi, int len)>();
-			for (int wi = 0; wi < wireCount; wi++)
+			var wireCandidates = new List<(OptitrackDeviceState state, float[] vals)>();
+			for (int si = 0; si < deviceStates.Count; si++)
 			{
-				float[] vals = natnetDeviceListener.GetDeviceChannelsByIndex(wi);
+				float[] vals;
+				if (!TryBuildNatNetDeviceValueArray(deviceStates[si], out vals))
+					continue;
 				if (vals == null || vals.Length < 1) continue;
 				int sentinel = Mathf.RoundToInt(vals[0]);
 				if (sentinel != port) continue;
-				wireCandidates.Add((wi, vals.Length));
+				wireCandidates.Add((deviceStates[si], vals));
 			}
-			wireCandidates.Sort((a, b) => b.len.CompareTo(a.len));
+			wireCandidates.Sort((a, b) => b.vals.Length.CompareTo(a.vals.Length));
 
 			// canonical 을 primary slice + overflow slice 로 분리
 			var primarySlice = new List<string>(1 + kCanonicalPrimaryCount);
@@ -487,9 +564,9 @@ public class StreamingleFacialReceiver : MonoBehaviour
 
 			// 0: primary (큰 채널 수), 1: overflow (작은 채널 수)
 			if (wireCandidates.Count > 0)
-				natnetResolvedDevices.Add(new ResolvedDevice { Id = 0, WireIndex = wireCandidates[0].wi, ChannelNames = primarySlice });
+				natnetResolvedDevices.Add(new ResolvedDevice { Id = wireCandidates[0].state.Id, DeviceName = wireCandidates[0].state.Name, ChannelNames = primarySlice });
 			if (wireCandidates.Count > 1)
-				natnetResolvedDevices.Add(new ResolvedDevice { Id = 0, WireIndex = wireCandidates[1].wi, ChannelNames = overflowSlice });
+				natnetResolvedDevices.Add(new ResolvedDevice { Id = wireCandidates[1].state.Id, DeviceName = wireCandidates[1].state.Name, ChannelNames = overflowSlice });
 			if (natnetLastSeenSeq.Length < natnetResolvedDevices.Count)
 				natnetLastSeenSeq = new ulong[natnetResolvedDevices.Count];
 		}
@@ -501,8 +578,8 @@ public class StreamingleFacialReceiver : MonoBehaviour
 		bool anyNew = false;
 		for (int di = 0; di < natnetResolvedDevices.Count; di++)
 		{
-			int wi = natnetResolvedDevices[di].WireIndex;
-			ulong seq = natnetDeviceListener.GetDeviceFrameSeqByIndex(wi);
+			OptitrackDeviceState state = FindNatNetDeviceState(deviceStates, natnetResolvedDevices[di].Id, natnetResolvedDevices[di].DeviceName);
+			ulong seq = state != null ? (ulong)(uint)state.FrameNumber : 0;
 			if (di < natnetLastSeenSeq.Length && seq != natnetLastSeenSeq[di])
 			{
 				natnetLastSeenSeq[di] = seq;
@@ -518,7 +595,10 @@ public class StreamingleFacialReceiver : MonoBehaviour
 		for (int di = 0; di < natnetResolvedDevices.Count; di++)
 		{
 			var rd = natnetResolvedDevices[di];
-			float[] vals = natnetDeviceListener.GetDeviceChannelsByIndex(rd.WireIndex);
+			OptitrackDeviceState state = FindNatNetDeviceState(deviceStates, rd.Id, rd.DeviceName);
+			float[] vals;
+			if (!TryBuildNatNetDeviceValueArray(state, out vals))
+				continue;
 			if (vals == null || rd.ChannelNames == null) continue;
 
 			if (!natnetDiagLogged)
@@ -529,7 +609,7 @@ public class StreamingleFacialReceiver : MonoBehaviour
 				int nameDump = Math.Min(5, rd.ChannelNames.Count);
 				var nameArr = new string[nameDump];
 				for (int k = 0; k < nameDump; k++) nameArr[k] = rd.ChannelNames[k];
-				Debug.Log($"[NatNet Align Diag] dev[{di}] WireIdx={rd.WireIndex} canonicalLen={rd.ChannelNames.Count} wireLen={vals.Length} firstNames=[{string.Join(",", nameArr)}] firstVals=[{string.Join(",", valDump)}]");
+				Debug.Log($"[NatNet Align Diag] dev[{di}] Device={rd.DeviceName} Id={rd.Id} canonicalLen={rd.ChannelNames.Count} wireLen={vals.Length} firstNames=[{string.Join(",", nameArr)}] firstVals=[{string.Join(",", valDump)}]");
 			}
 
 			// Canonical 매핑: rd.ChannelNames 는 [sentinelPort, canonical[a], canonical[a+1], ...]