refactor(animation): extract live PartArray presenter

Move final live part composition, exact-incarnation schedule handoff, MotionDone binding, and presentation diagnostics out of GameWindow while preserving the retail frame order. Reject stale schedule and completion ABA at the new owner boundary.

Co-Authored-By: OpenAI Codex <codex@openai.com>

src/AcDream.App/Physics/RemotePhysicsUpdater.cs

@@ -1,5 +1,5 @@
 using RemoteMotion = AcDream.App.Rendering.GameWindow.RemoteMotion;
-using AnimatedEntity = AcDream.App.Rendering.GameWindow.AnimatedEntity;
+using LiveEntityAnimationState = AcDream.App.Rendering.LiveEntityAnimationState;
 
 namespace AcDream.App.Physics;
 
@@ -40,13 +40,13 @@ internal sealed class RemotePhysicsUpdater
 
     private readonly AcDream.Core.Physics.PhysicsEngine _physicsEngine;
     private readonly System.Func<uint, AcDream.Core.World.WorldEntity, (float Radius, float Height)> _getSetupCylinder;
-    private readonly System.Action<uint, AnimatedEntity, RemoteMotion, System.Numerics.Vector3> _applyServerControlledVelocityCycle;
+    private readonly System.Action<uint, LiveEntityAnimationState, RemoteMotion, System.Numerics.Vector3> _applyServerControlledVelocityCycle;
     private readonly List<AcDream.App.World.LiveEntityRecord> _spatialRemoteSnapshot = new();
 
     internal RemotePhysicsUpdater(
         AcDream.Core.Physics.PhysicsEngine physicsEngine,
         System.Func<uint, AcDream.Core.World.WorldEntity, (float Radius, float Height)> getSetupCylinder,
-        System.Action<uint, AnimatedEntity, RemoteMotion, System.Numerics.Vector3> applyServerControlledVelocityCycle)
+        System.Action<uint, LiveEntityAnimationState, RemoteMotion, System.Numerics.Vector3> applyServerControlledVelocityCycle)
     {
         _physicsEngine = physicsEngine;
         _getSetupCylinder = getSetupCylinder;
@@ -58,7 +58,7 @@ internal sealed class RemotePhysicsUpdater
 
     /// <summary>
     /// Advances the retained PositionManager path for every hidden remote,
-    /// including objects without an <c>AnimatedEntity</c> (missiles commonly
+    /// including objects without an <c>LiveEntityAnimationState</c> (missiles commonly
     /// have no PartArray). Retail gates this path on the live CPhysicsObj, not
     /// on whether a render-animation owner exists.
     /// </summary>
@@ -93,7 +93,7 @@ internal sealed class RemotePhysicsUpdater
                 || record.WorldEntity is not { } entity)
                 continue;
 
-            AnimatedEntity? animation = record.AnimationRuntime as AnimatedEntity;
+            LiveEntityAnimationState? animation = record.AnimationRuntime as LiveEntityAnimationState;
             AcDream.Core.Physics.RetailObjectActivityResult activity =
                 AcDream.Core.Physics.RetailObjectActivityGate.Evaluate(
                     record.ObjectClock,
@@ -165,7 +165,7 @@ internal sealed class RemotePhysicsUpdater
     /// </summary>
     public bool Tick(
         RemoteMotion rm,
-        AnimatedEntity ae,
+        LiveEntityAnimationState ae,
         float dt,
         AcDream.Core.Physics.Motion.MotionDeltaFrame rootMotionLocalFrame,
         int liveCenterX,
@@ -188,14 +188,14 @@ internal sealed class RemotePhysicsUpdater
     /// Canonical ordinary-object tick. Render animation is optional: retail
     /// walks <c>CPhysics::object_maint</c>, so a live object with a
     /// MovementManager or PositionManager must continue even when it has no
-    /// <c>AnimatedEntity</c> presentation component.
+    /// <c>LiveEntityAnimationState</c> presentation component.
     /// </summary>
     public bool Tick(
         RemoteMotion rm,
         AcDream.Core.World.WorldEntity entity,
         float objectScale,
         AcDream.Core.Physics.AnimationSequencer? sequencer,
-        AnimatedEntity? animationForVelocityCycle,
+        LiveEntityAnimationState? animationForVelocityCycle,
         float dt,
         AcDream.Core.Physics.Motion.MotionDeltaFrame rootMotionLocalFrame,
         int liveCenterX,

src/AcDream.App/Rendering/AnimationPresentationDiagnostics.cs

@@ -0,0 +1,21 @@
+namespace AcDream.App.Rendering;
+
+/// <summary>Startup-resolved diagnostic gates for final PartArray presentation.</summary>
+internal sealed record AnimationPresentationDiagnostics(
+    bool RemoteVelocityEnabled,
+    bool DumpMotionEnabled,
+    Func<double> Now)
+{
+    public static AnimationPresentationDiagnostics FromEnvironment() => new(
+        RemoteVelocityEnabled:
+            Environment.GetEnvironmentVariable("ACDREAM_REMOTE_VEL_DIAG") == "1",
+        DumpMotionEnabled:
+            Environment.GetEnvironmentVariable("ACDREAM_DUMP_MOTION") == "1",
+        Now: static () =>
+            (DateTime.UtcNow - DateTime.UnixEpoch).TotalSeconds);
+
+    public static AnimationPresentationDiagnostics Disabled { get; } = new(
+        false,
+        false,
+        static () => 0d);
+}

src/AcDream.App/Rendering/GameWindow.cs

@@ -9,7 +9,7 @@ using Silk.NET.Windowing;
 
 namespace AcDream.App.Rendering;
 
-public sealed class GameWindow : IDisposable
+public sealed class GameWindow : IDisposable, ILiveAnimationPresentationContext
 {
     private static double ClientTimerNow() =>
         System.Diagnostics.Stopwatch.GetTimestamp()
@@ -182,6 +182,7 @@ public sealed class GameWindow : IDisposable
     private readonly AcDream.App.World.RetailInboundEventDispatcher
         _inboundEntityEvents = new();
     private readonly LiveEntityAnimationScheduler _liveAnimationScheduler;
+    private readonly LiveEntityAnimationPresenter _animationPresenter;
     private readonly AcDream.App.Input.LocalPlayerProjectionController _localPlayerProjection;
     private readonly AcDream.App.Input.LocalPlayerOutboundController _localPlayerOutbound;
     private readonly AcDream.App.Input.RetailLocalPlayerFrameController _localPlayerFrame;
@@ -278,7 +279,7 @@ public sealed class GameWindow : IDisposable
     /// Static decorations and entities with no motion table never
     /// appear in this map.
     /// </summary>
-    private readonly LiveEntityAnimationRuntimeView<AnimatedEntity> _animatedEntities;
+    private readonly LiveEntityAnimationRuntimeView<LiveEntityAnimationState> _animatedEntities;
 
     // MP-Alloc (2026-07-05): reusable per-frame snapshot of _animatedEntities.Keys.
     // WbDrawDispatcher.WalkEntitiesInto treats null and an empty set identically
@@ -298,73 +299,9 @@ public sealed class GameWindow : IDisposable
     /// </summary>
     private readonly AcDream.App.Rendering.Wb.EntityClassificationCache _classificationCache = new();
 
-    // #184 Slice 2a: internal (was private) so the extracted
-    // RemotePhysicsUpdater in AcDream.App.Physics can take it by type. Matches
-    // RemoteMotion's existing internal visibility.
-    internal sealed class AnimatedEntity : AcDream.App.World.ILiveEntityAnimationRuntime
-    {
-        public required AcDream.Core.World.WorldEntity Entity;
-        AcDream.Core.World.WorldEntity AcDream.App.World.ILiveEntityAnimationRuntime.Entity => Entity;
-        uint AcDream.App.World.ILiveEntityAnimationRuntime.CurrentMotion =>
-            Sequencer?.CurrentMotion ?? 0u;
-        public required DatReaderWriter.DBObjs.Setup Setup;
-        public required DatReaderWriter.DBObjs.Animation Animation;
-        public required int LowFrame;
-        public required int HighFrame;
-        public required float Framerate;     // frames per second
-        public required float Scale;         // server ObjScale baked into part transforms each tick
-        /// <summary>
-        /// Per-part identity carried over from the hydration pass: the
-        /// (post-AnimPartChanges) GfxObjId and the (post-resolution)
-        /// surface override map. The transform is recomputed every tick
-        /// from the current animation frame; only these two fields are
-        /// reused unchanged.
-        /// </summary>
-        public required IReadOnlyList<AnimatedPartTemplate> PartTemplate;
-        public required IReadOnlyList<bool> PartAvailability;
-        public float CurrFrame;              // monotonically increasing within [LowFrame, HighFrame]
-        public AcDream.Core.Physics.AnimationSequencer? Sequencer;
-
-        // The local player's CPartArray is advanced from
-        // PlayerMovementController before its 30 Hz physics integration so
-        // the exact authored root delta enters the collision sweep. Retain
-        // that same advance's part pose for TickAnimations; advancing the
-        // sequencer a second time would double both animation time and hooks.
-        public IReadOnlyList<AcDream.Core.Physics.PartTransform>? PreparedSequenceFrames;
-        public bool SequenceAdvancedBeforeAnimationPass;
-        public readonly DatReaderWriter.Types.Frame RootMotionScratch = new();
-        public readonly AcDream.Core.Physics.Motion.MotionDeltaFrame
-            RootMotionDeltaScratch = new();
-
-        /// <summary>
-        /// MP-Alloc (2026-07-05): reusable per-entity MeshRefs buffer. Every
-        /// animated entity (including idle NPCs on a breathe cycle) used to
-        /// get a fresh `List&lt;MeshRef&gt;(partCount)` reassigned to
-        /// <see cref="AcDream.Core.World.WorldEntity.MeshRefs"/> every tick —
-        /// the old list became garbage every frame. This buffer is cleared
-        /// and refilled in place instead; <c>Entity.MeshRefs</c> is set to
-        /// this SAME list reference once it's populated (assigning the
-        /// unchanged reference back is a no-op cost-wise). Safe because
-        /// TickAnimations runs single-threaded to completion before any
-        /// draw-side consumer reads MeshRefs, and the only cross-frame
-        /// consumer (RefreshPaperdollDoll) takes an explicit
-        /// `new List&lt;MeshRef&gt;(pe.MeshRefs)` VALUE copy — MeshRef is a
-        /// readonly record struct, so that copy is unaffected by later
-        /// in-place mutation of this list.
-        /// </summary>
-        public readonly List<AcDream.Core.World.MeshRef> MeshRefsScratch = new();
-        /// <summary>Indexed final part poses, including debug-hidden parts.</summary>
-        public readonly List<System.Numerics.Matrix4x4> EffectPartPosesScratch = new();
-    }
-
-    internal readonly record struct AnimatedPartTemplate(
-        uint GfxObjId,
-        IReadOnlyDictionary<uint, uint>? SurfaceOverrides,
-        bool IsDrawable);
-
     private sealed record AppearanceUpdateState(
         AcDream.Core.World.WorldEntity Entity,
-        AnimatedEntity? Animation);
+        LiveEntityAnimationState? Animation);
 
     private AcDream.Core.Physics.IAnimationLoader? _animLoader;
 
@@ -1203,7 +1140,7 @@ public sealed class GameWindow : IDisposable
         _worldEvents = worldEvents;
         _selection = selection ?? throw new System.ArgumentNullException(nameof(selection));
         _uiRegistry = uiRegistry;
-        _animatedEntities = new LiveEntityAnimationRuntimeView<AnimatedEntity>(() => _liveEntities);
+        _animatedEntities = new LiveEntityAnimationRuntimeView<LiveEntityAnimationState>(() => _liveEntities);
         _remoteDeadReckon = new LiveEntityRemoteMotionRuntimeView<RemoteMotion>(() => _liveEntities);
         SpellBook = new AcDream.Core.Spells.Spellbook();
         LocalPlayer = new AcDream.Core.Player.LocalPlayerState(SpellBook);
@@ -1229,6 +1166,13 @@ public sealed class GameWindow : IDisposable
             () => _projectileController,
             entity => _effectPoses.UpdateRoot(entity),
             CaptureAnimationHooks);
+        _animationPresenter = new LiveEntityAnimationPresenter(
+            () => _liveEntities,
+            () => _staticAnimationScheduler,
+            _effectPoses,
+            this,
+            AnimationPresentationDiagnostics.FromEnvironment(),
+            options.HidePartIndex);
         _localPlayerProjection = new AcDream.App.Input.LocalPlayerProjectionController(
             resolveEntity: () =>
                 _entitiesByServerGuid.TryGetValue(_playerServerGuid, out var entity)
@@ -4140,7 +4084,7 @@ public sealed class GameWindow : IDisposable
         var meshRefs = new List<AcDream.Core.World.MeshRef>();
         var indexedPartTransforms = new System.Numerics.Matrix4x4[parts.Count];
         var indexedPartAvailable = new bool[parts.Count];
-        var animatedPartTemplate = new AnimatedPartTemplate[parts.Count];
+        var animatedPartTemplate = new LiveAnimationPartTemplate[parts.Count];
         var liveBounds = new AcDream.Core.Meshing.LocalBoundsAccumulator();
         int dumpClothingTotalTris = 0;
         for (int partIdx = 0; partIdx < parts.Count; partIdx++)
@@ -4160,7 +4104,7 @@ public sealed class GameWindow : IDisposable
             var gfx = _dats.Get<DatReaderWriter.DBObjs.GfxObj>(mr.GfxObjId);
             bool isDrawable = gfx is not null;
             indexedPartAvailable[partIdx] = isDrawable;
-            animatedPartTemplate[partIdx] = new AnimatedPartTemplate(
+            animatedPartTemplate[partIdx] = new LiveAnimationPartTemplate(
                 mr.GfxObjId,
                 surfaceOverrides,
                 isDrawable);
@@ -4419,7 +4363,7 @@ public sealed class GameWindow : IDisposable
             // Snapshot per-part identity from the hydrated meshRefs so the
             // tick can rebuild MeshRefs without redoing AnimPartChanges or
             // texture-override resolution every frame.
-            AnimatedPartTemplate[] template = animatedPartTemplate;
+            LiveAnimationPartTemplate[] template = animatedPartTemplate;
 
             // Create an AnimationSequencer if we can load the MotionTable.
             AcDream.Core.Physics.AnimationSequencer? sequencer = null;
@@ -4437,7 +4381,7 @@ public sealed class GameWindow : IDisposable
                 }
             }
 
-            _animatedEntities[entity.Id] = new AnimatedEntity
+            _animatedEntities[entity.Id] = new LiveEntityAnimationState
             {
                 Entity = entity,
                 Setup = setup,
@@ -4492,9 +4436,9 @@ public sealed class GameWindow : IDisposable
                     var sequencer = SpawnMotionInitializer.Create(
                         setup, mtable, _animLoader, spawn.MotionState);
 
-                    AnimatedPartTemplate[] template = animatedPartTemplate;
+                    LiveAnimationPartTemplate[] template = animatedPartTemplate;
 
-                    _animatedEntities[entity.Id] = new AnimatedEntity
+                    _animatedEntities[entity.Id] = new LiveEntityAnimationState
                     {
                         Entity = entity,
                         Setup = setup,
@@ -4541,7 +4485,7 @@ public sealed class GameWindow : IDisposable
                 setupDefaultLoader);
             if (sequencer.HasCurrentNode)
             {
-                _animatedEntities[entity.Id] = new AnimatedEntity
+                _animatedEntities[entity.Id] = new LiveEntityAnimationState
                 {
                     Entity = entity,
                     Setup = setup,
@@ -4565,7 +4509,8 @@ public sealed class GameWindow : IDisposable
         // unmatched node that permanently starves later MoveTo/TurnTo work.
         if (_animatedEntities.TryGetValue(entity.Id, out var registeredAnimation))
         {
-            EnsureMotionDoneBinding(spawn.Guid, registeredAnimation);
+            if (_liveEntities.TryGetRecord(spawn.Guid, out LiveEntityRecord bindingRecord))
+                _animationPresenter.PrepareAnimation(bindingRecord, registeredAnimation);
 
             if (isPhysicsStatic
                 && registeredAnimation.Sequencer is { } staticSequencer
@@ -4736,11 +4681,11 @@ public sealed class GameWindow : IDisposable
     }
 
     internal static void RebindAnimatedEntityForAppearance(
-        AnimatedEntity animation,
+        LiveEntityAnimationState animation,
         AcDream.Core.World.WorldEntity entity,
         DatReaderWriter.DBObjs.Setup setup,
         float scale,
-        IReadOnlyList<AnimatedPartTemplate> partTemplate,
+        IReadOnlyList<LiveAnimationPartTemplate> partTemplate,
         IReadOnlyList<bool> partAvailability)
     {
         animation.Entity = entity;
@@ -4748,6 +4693,7 @@ public sealed class GameWindow : IDisposable
         animation.Scale = scale;
         animation.PartTemplate = partTemplate;
         animation.PartAvailability = partAvailability;
+        animation.InvalidatePresentationPoses();
     }
 
     /// <summary>
@@ -5208,7 +5154,7 @@ public sealed class GameWindow : IDisposable
     /// the VectorUpdate path regardless of arrival order.
     /// </summary>
     private AcDream.Core.Physics.Motion.MotionTableDispatchSink? EnsureRemoteMotionBindings(
-        RemoteMotion rm, AnimatedEntity? ae, uint serverGuid)
+        RemoteMotion rm, LiveEntityAnimationState? ae, uint serverGuid)
     {
         AcDream.Core.Physics.AnimationSequencer? sequencer = ae?.Sequencer;
         if (sequencer is not null && rm.Sink is null)
@@ -5812,7 +5758,7 @@ public sealed class GameWindow : IDisposable
 
     /// <summary>
     /// Phase 6.6: the server says an entity's motion has changed. Look up
-    /// the AnimatedEntity for that guid, re-resolve the idle cycle with the
+    /// the LiveEntityAnimationState for that guid, re-resolve the idle cycle with the
     /// new (stance, forward-command) override, and if the cycle is still
     /// animated, swap in the new animation/frame range. Entities not in
     /// the animated map (static props, entities rejected at spawn time)
@@ -6220,7 +6166,7 @@ public sealed class GameWindow : IDisposable
         DispatchRemoteInboundMotion(
         AcDream.Core.Net.WorldSession.EntityMotionUpdate update,
         AcDream.Core.World.WorldEntity entity,
-        AnimatedEntity? ae,
+        LiveEntityAnimationState? ae,
         LiveEntityRecord acceptedRecord,
         ulong acceptedMovementAuthorityVersion,
         ulong acceptedVelocityAuthorityVersion)
@@ -6557,7 +6503,7 @@ public sealed class GameWindow : IDisposable
 
     private void ApplyServerControlledVelocityCycle(
         uint serverGuid,
-        AnimatedEntity ae,
+        LiveEntityAnimationState ae,
         RemoteMotion rm,
         System.Numerics.Vector3 velocity)
     {
@@ -7355,7 +7301,7 @@ public sealed class GameWindow : IDisposable
                     // Enqueue only if the canonical ordinary-object workset
                     // will consume the queue. Animation is optional in retail;
                     // LiveEntityAnimationScheduler advances a spatial
-                    // RemoteMotion even when no AnimatedEntity exists.
+                    // RemoteMotion even when no LiveEntityAnimationState exists.
                     bool willBeDrTickedNpc = WillAdvanceRemoteMotion(
                         update.Guid,
                         rmState);
@@ -11505,12 +11451,12 @@ public sealed class GameWindow : IDisposable
             _localPlayerFrame.HiddenPartPoseDirty,
             _liveCenterX,
             _liveCenterY,
-            EnsureMotionDoneBinding);
+            _animationPresenter.PrepareAnimation);
         // CPhysics::UseTime (0x00509950) processes the ordinary object table
         // first, then its distinct static_animating_objects workset.
         _staticAnimationScheduler?.Tick(dt);
         if (_animatedEntities.Count > 0)
-            TickAnimations(animationSchedules);
+            _animationPresenter.Present(animationSchedules);
         _equippedChildRenderer?.Tick();
 
         // CPhysicsObj::animate_static_object (0x00513DF0) reaches
@@ -11569,7 +11515,7 @@ public sealed class GameWindow : IDisposable
     /// <paramref name="dt"/> * Framerate, wrapping around the cycle's
     /// [LowFrame..HighFrame] interval, then rebuild that entity's
     /// MeshRefs from the new frame's per-part transforms. Static
-    /// entities (no AnimatedEntity record) are untouched. The static
+    /// entities (no LiveEntityAnimationState record) are untouched. The static
     /// renderer reads the new MeshRefs on the next Draw call.
     /// </summary>
     private void AdvanceLocalPlayerAnimationRoot(
@@ -11588,7 +11534,8 @@ public sealed class GameWindow : IDisposable
             return;
         }
 
-        EnsureMotionDoneBinding(_playerServerGuid, ae);
+        if (_liveEntities?.TryGetRecord(_playerServerGuid, out LiveEntityRecord bindingRecord) == true)
+            _animationPresenter.PrepareAnimation(bindingRecord, ae);
 
         DatReaderWriter.Types.Frame rootFrame = ae.RootMotionScratch;
         rootFrame.Origin = System.Numerics.Vector3.Zero;
@@ -11615,320 +11562,22 @@ public sealed class GameWindow : IDisposable
         AcDream.Core.Physics.AnimationSequencer sequencer) =>
         _animationHookFrames?.Capture(ownerLocalId, sequencer);
 
-    private void TickAnimations(
-        IReadOnlyDictionary<uint, LiveEntityAnimationSchedule> animationSchedules)
+    uint ILiveAnimationPresentationContext.LocalPlayerGuid => _playerServerGuid;
+
+    AcDream.Core.Physics.MotionInterpreter?
+        ILiveAnimationPresentationContext.ResolveMotionInterpreter(
+            LiveEntityRecord record)
     {
-        // Retail has NO stop-detection heuristic — it relies on the
-        // server sending explicit UpdateMotion(Ready). The server-side
-        // stop signal flows the same way as any other motion change:
-        //   alt releases W → MoveToState(Ready) → ACE broadcasts
-        //   UpdateMotion(Ready) + UpdatePosition with zero velocity.
-        // On our side, only UpdateMotion changes interpreted state;
-        // UpdatePosition updates physics pose/velocity and never selects an
-        // animation. Anything else is server buggery (packet loss, ACE bug)
-        // — don't guess client-side.
-        foreach (var kv in _animatedEntities)
+        if (_liveEntities?.TryGetRecord(record.ServerGuid, out LiveEntityRecord current) != true
+            || !ReferenceEquals(current, record))
         {
-            var ae = kv.Value;
-
-            // The server guid is carried on the entity itself
-            // (WorldEntity.ServerGuid, set == the _entitiesByServerGuid key at
-            // construction — see OnLiveEntitySpawnedLocked: `ServerGuid = spawn.Guid`
-            // and `_entitiesByServerGuid[spawn.Guid] = entity`). Read it directly —
-            // O(1) — instead of the former reverse ReferenceEquals scan over ALL of
-            // _entitiesByServerGuid, which made this loop O(animated × all-entities).
-            // That super-linear cost is the FPS-drops-per-teleport sink: world
-            // entities accumulate without bound (pruned only on DeleteObject, and ACE
-            // does not re-send / clear KnownObjects across a teleport), so N climbs
-            // every hop. ServerGuid defaults to 0 for entities not server-tracked,
-            // exactly matching the old scan's miss case.
-            uint serverGuid = ae.Entity.ServerGuid;
-
-            // Defensive for a runtime retained across visual rehydration.
-            // This is deliberately before every early-out and before
-            // Sequencer.Advance: no completion may precede its consumer.
-            EnsureMotionDoneBinding(serverGuid, ae);
-
-            if (_liveEntities?.TryGetRecord(
-                    serverGuid,
-                    out LiveEntityRecord liveRecord) != true)
-            {
-                continue;
-            }
-            animationSchedules.TryGetValue(kv.Key, out LiveEntityAnimationSchedule schedule);
-            IReadOnlyList<AcDream.Core.Physics.PartTransform>? seqFrames =
-                schedule.SequenceFrames;
-            bool composeParts = schedule.ComposeParts;
-            if (_staticAnimationScheduler?.TryTakeLivePartFrames(
-                    kv.Key,
-                    out var staticPartFrames) == true)
-            {
-                seqFrames = staticPartFrames;
-                composeParts = true;
-            }
-
-            // ── Get per-part (origin, orientation) from either sequencer or legacy ──
-            if (ae.Sequencer is not null)
-            {
-                // Per-tick sequencer-state diag: prove whether the sequencer
-                // for the observed retail char actually holds the latest
-                // motion (= SetCycle landed) OR is stuck on an old motion
-                // (= something elsewhere is reverting). Throttled to once
-                // per second per remote.
-                if (System.Environment.GetEnvironmentVariable("ACDREAM_REMOTE_VEL_DIAG") == "1"
-                    && serverGuid != 0
-                    && serverGuid != _playerServerGuid)
-                {
-                    double nowSec = (System.DateTime.UtcNow - System.DateTime.UnixEpoch).TotalSeconds;
-                    if (_remoteDeadReckon.TryGetValue(serverGuid, out var rmDiag)
-                        && nowSec - rmDiag.LastSeqStateLogTime > 1.0)
-                    {
-                        // D1 (2026-05-03): SEQSTATE has its own throttle clock
-                        // (LastSeqStateLogTime) so it isn't silently swallowed by
-                        // OMEGA_DIAG resetting LastOmegaDiagLogTime when the
-                        // observed remote happens to be turning.
-                        System.Console.WriteLine(
-                            $"[SEQSTATE] guid={serverGuid:X8} CurrentMotion=0x{ae.Sequencer.CurrentMotion:X8} "
-                            + $"CurrentSpeedMod={ae.Sequencer.CurrentSpeedMod:F3}");
-
-                        // #39 fix-3 evidence (2026-05-06): CURRNODE proves
-                        // whether _currNode is actually on the cycle (anim
-                        // ref hash matches FirstCyclic) or stuck somewhere
-                        // else. SCFULL captures _currNode==_firstCyclic only
-                        // at SetCycle return; this captures it per render
-                        // tick so we can see if something resets it later.
-                        var d = ae.Sequencer.CurrentNodeDiag;
-                        int firstHash = ae.Sequencer.FirstCyclicAnimRefHash;
-                        System.Console.WriteLine(
-                            $"[CURRNODE] guid={serverGuid:X8} "
-                            + $"animRef=0x{d.AnimRefHash:X8} firstCyclicAnimRef=0x{firstHash:X8} "
-                            + $"isOnCyclic={d.AnimRefHash == firstHash && firstHash != 0} "
-                            + $"isLooping={d.IsLooping} fr={d.Framerate:F2} "
-                            + $"frame=[{d.StartFrame}..{d.EndFrame}] "
-                            + $"pos={d.FramePosition:F2} qCount={d.QueueCount}");
-
-                        rmDiag.LastSeqStateLogTime = nowSec;
-                    }
-                }
-            }
-            else
-            {
-                // Legacy path (entities without a MotionTable / sequencer).
-                int span = ae.HighFrame - ae.LowFrame;
-                bool hiddenLegacy = (liveRecord.FinalPhysicsState
-                    & AcDream.Core.Physics.PhysicsStateFlags.Hidden) != 0;
-                if (span <= 0 && !hiddenLegacy) continue;
-                if (span > 0 && schedule.LegacyAdvanceSeconds > 0f)
-                {
-                    ae.CurrFrame += schedule.LegacyAdvanceSeconds * ae.Framerate;
-                    if (ae.CurrFrame > ae.HighFrame)
-                    {
-                        float over = ae.CurrFrame - ae.LowFrame;
-                        ae.CurrFrame = ae.LowFrame + (over % (span + 1));
-                    }
-                    else if (ae.CurrFrame < ae.LowFrame)
-                        ae.CurrFrame = ae.LowFrame;
-                }
-            }
-
-            int partCount = ae.PartTemplate.Count;
-
-            // D5 (Commit A 2026-05-03): PARTSDIAG — proves whether
-            // PartTemplate.Count diverges from seqFrames.Count (silent
-            // identity-quat fallback freezes parts → H5) and whether the
-            // per-part frames returned by Advance actually change between
-            // Walk and Run cycles. The seqFrames hash is a sum-of-components
-            // proxy: cheap, unitless, monotonically distinct between cycles
-            // for any non-degenerate animation. If [PARTSDIAG] shows the
-            // hash unchanged across a Walk→Run transition while [SEQSTATE]
-            // shows CurrentMotion flipping, the sequencer is serving stale
-            // frames despite the cycle being correct.
-            if (System.Environment.GetEnvironmentVariable("ACDREAM_REMOTE_VEL_DIAG") == "1"
-                && serverGuid != 0
-                && serverGuid != _playerServerGuid
-                && _remoteDeadReckon.TryGetValue(serverGuid, out var rmParts))
-            {
-                double nowSecParts = (System.DateTime.UtcNow - System.DateTime.UnixEpoch).TotalSeconds;
-                if (nowSecParts - rmParts.LastPartsDiagLogTime > 1.0)
-                {
-                    int seqCount = seqFrames?.Count ?? -1;
-                    int setupParts = ae.Setup.Parts.Count;
-                    // #62: B.4c introduced `Animation = null!` for sequencer-driven
-                    // door entities (parallel branch sites at line 2867 + 7892).
-                    // Doors don't currently enter _remoteDeadReckon, so this
-                    // path isn't reachable for them today — but the read was
-                    // unguarded and would NRE the moment something flips.
-                    // Local-var + `is not null` keeps the guard scoped: the
-                    // legacy slerp branch below treats ae.Animation as non-
-                    // null (per its non-nullable declared type) unchanged.
-                    var animMaybeNull = ae.Animation;
-                    int animFrame0Parts =
-                        animMaybeNull is not null && animMaybeNull.PartFrames.Count > 0
-                            ? animMaybeNull.PartFrames[0].Frames.Count
-                            : -1;
-                    double seqHash = 0.0;
-                    if (seqFrames is not null)
-                    {
-                        for (int hi = 0; hi < seqFrames.Count; hi++)
-                        {
-                            var f = seqFrames[hi];
-                            seqHash += f.Origin.X + f.Origin.Y + f.Origin.Z
-                                     + f.Orientation.X + f.Orientation.Y
-                                     + f.Orientation.Z + f.Orientation.W;
-                        }
-                    }
-                    System.Console.WriteLine(
-                        $"[PARTSDIAG] guid={serverGuid:X8} "
-                        + $"pt.Count={partCount} seqFrames.Count={seqCount} "
-                        + $"setup.Parts.Count={setupParts} "
-                        + $"anim.PartFrames[0].Frames.Count={animFrame0Parts} "
-                        + $"seqHash={seqHash:F4}");
-                    rmParts.LastPartsDiagLogTime = nowSecParts;
-                }
-            }
-
-            if (!composeParts)
-                continue;
-
-            // MP-Alloc (2026-07-05): reuse the entity's cached MeshRefs list
-            // instead of allocating a fresh List<MeshRef>(partCount) every
-            // tick (see AnimatedEntity.MeshRefsScratch for the safety
-            // argument — single-threaded tick-before-draw ordering, no
-            // consumer caches a stale reference or diffs list identity).
-            var newMeshRefs = ae.MeshRefsScratch;
-            newMeshRefs.Clear();
-            var effectPartPoses = ae.EffectPartPosesScratch;
-            effectPartPoses.Clear();
-            var scaleMat = ae.Scale == 1.0f
-                ? System.Numerics.Matrix4x4.Identity
-                : System.Numerics.Matrix4x4.CreateScale(ae.Scale);
-
-            for (int i = 0; i < partCount; i++)
-            {
-                System.Numerics.Vector3 origin;
-                System.Numerics.Quaternion orientation;
-
-                if (seqFrames is not null)
-                {
-                    // Sequencer path.
-                    if (i < seqFrames.Count)
-                    {
-                        origin = seqFrames[i].Origin;
-                        orientation = seqFrames[i].Orientation;
-                    }
-                    else
-                    {
-                        origin = System.Numerics.Vector3.Zero;
-                        orientation = System.Numerics.Quaternion.Identity;
-                    }
-                }
-                else
-                {
-                    // Legacy slerp path.
-                    int frameIdx = (int)Math.Floor(ae.CurrFrame);
-                    if (frameIdx < ae.LowFrame || frameIdx > ae.HighFrame
-                        || frameIdx >= ae.Animation.PartFrames.Count)
-                        frameIdx = ae.LowFrame;
-                    int nextIdx = frameIdx + 1;
-                    if (nextIdx > ae.HighFrame || nextIdx >= ae.Animation.PartFrames.Count)
-                        nextIdx = ae.LowFrame;
-                    float t = ae.CurrFrame - frameIdx;
-                    if (t < 0f) t = 0f; else if (t > 1f) t = 1f;
-                    var partFrames = ae.Animation.PartFrames[frameIdx].Frames;
-                    var partFramesNext = ae.Animation.PartFrames[nextIdx].Frames;
-                    if (i < partFrames.Count)
-                    {
-                        var f0 = partFrames[i];
-                        var f1 = i < partFramesNext.Count ? partFramesNext[i] : f0;
-                        origin = System.Numerics.Vector3.Lerp(f0.Origin, f1.Origin, t);
-                        orientation = System.Numerics.Quaternion.Slerp(f0.Orientation, f1.Orientation, t);
-                    }
-                    else
-                    {
-                        origin = System.Numerics.Vector3.Zero;
-                        orientation = System.Numerics.Quaternion.Identity;
-                    }
-                }
-
-                // Per-part default scale from the Setup, matching SetupMesh.Flatten's
-                // composition order: scale → rotate → translate.
-                var defaultScale = i < ae.Setup.DefaultScale.Count
-                    ? ae.Setup.DefaultScale[i]
-                    : System.Numerics.Vector3.One;
-
-                var visualPartTransform =
-                    System.Numerics.Matrix4x4.CreateScale(defaultScale) *
-                    System.Numerics.Matrix4x4.CreateFromQuaternion(orientation) *
-                    System.Numerics.Matrix4x4.CreateTranslation(origin);
-
-                // Bake the entity's ObjScale on top, matching the hydration
-                // order (PartTransform * scaleMat) — see comment in OnLiveEntitySpawned.
-                if (ae.Scale != 1.0f)
-                    visualPartTransform *= scaleMat;
-
-                // Retail CPartArray::UpdateParts (0x005190F0) scales only the
-                // frame origin. Setup DefaultScale is visual gfxobj_scale,
-                // not part-frame state (SetScaleInternal 0x00518A00).
-                var rigidPartTransform =
-                    System.Numerics.Matrix4x4.CreateFromQuaternion(orientation) *
-                    System.Numerics.Matrix4x4.CreateTranslation(origin * ae.Scale);
-                effectPartPoses.Add(rigidPartTransform);
-
-                var template = ae.PartTemplate[i];
-                if (!template.IsDrawable
-                    || (_options.HidePartIndex >= 0 && i == _options.HidePartIndex && partCount >= 10))
-                {
-                    continue;
-                }
-                newMeshRefs.Add(new AcDream.Core.World.MeshRef(template.GfxObjId, visualPartTransform)
-                {
-                    SurfaceOverrides = template.SurfaceOverrides,
-                });
-            }
-
-            // Re-assigning the SAME list reference every tick is cheap (a
-            // property store) and keeps this line's shape identical to the
-            // pre-MP-Alloc code for anyone grepping the history.
-            ae.Entity.MeshRefs = newMeshRefs;
-            ae.Entity.SetIndexedPartPoses(effectPartPoses, ae.PartAvailability);
-            _effectPoses.Publish(ae.Entity, effectPartPoses, ae.PartAvailability);
+            return null;
         }
-    }
-
-    /// <summary>
-    /// R3-W2: binds the animation queue's completion seam to the entity's
-    /// real <c>CMotionInterp::MotionDone</c> consumer
-    /// (<c>CPhysicsObj::MotionDone</c> 0x0050FDB0). Retail owns both queues
-    /// under one CPhysicsObj/CPartArray lifetime; acdream's split owners must
-    /// establish the relationship before the first animation can finish.
-    /// </summary>
-    private void EnsureMotionDoneBinding(uint serverGuid, AnimatedEntity ae)
-    {
-        if (ae.Sequencer is not { MotionDoneTarget: null } sequencer)
-            return;
-
-        uint ownerGuid = serverGuid;
-        // Resolve at callback time: a remote MotionInterpreter can be created
-        // after its animation runtime, and the player controller is created
-        // during EnterPlayerModeNow. Eagerly capturing either would preserve
-        // a legitimate null forever.
-        sequencer.MotionDoneTarget = (motion, success) =>
-        {
-            AcDream.Core.Physics.MotionInterpreter? interpreter = null;
-            if (ownerGuid != 0 && ownerGuid == _playerServerGuid)
-                interpreter = _playerController?.Motion;
-            else if (ownerGuid != 0
-                     && _remoteDeadReckon.TryGetValue(ownerGuid, out var remote))
-                interpreter = remote.Motion;
-
-            interpreter?.MotionDone(motion, success);
-            if (System.Environment.GetEnvironmentVariable("ACDREAM_DUMP_MOTION") == "1")
-            {
-                System.Console.WriteLine(
-                    $"[MOTIONDONE] guid={ownerGuid:X8} motion=0x{motion:X8} "
-                    + $"success={success} pending={(interpreter?.MotionsPending() ?? false)}");
-            }
-        };
+        if (record.ServerGuid == _playerServerGuid)
+            return _playerController?.Motion;
+        return record.RemoteMotionRuntime is RemoteMotion remote
+            ? remote.Motion
+            : null;
     }
 
     // IsEntityCurrentlyMoving REMOVED (2026-07-09): it powered a cache-bypass

src/AcDream.App/Rendering/ILiveAnimationPresentationContext.cs

@@ -0,0 +1,10 @@
+using AcDream.App.World;
+using AcDream.Core.Physics;
+
+namespace AcDream.App.Rendering;
+
+internal interface ILiveAnimationPresentationContext
+{
+    uint LocalPlayerGuid { get; }
+    MotionInterpreter? ResolveMotionInterpreter(LiveEntityRecord record);
+}

src/AcDream.App/Rendering/ILiveStaticPartFrameSource.cs

@@ -0,0 +1,21 @@
+using AcDream.App.World;
+using AcDream.Core.Physics;
+using AcDream.Core.World;
+
+namespace AcDream.App.Rendering;
+
+/// <summary>
+/// Late presentation handoff from retail's separate
+/// <c>static_animating_objects</c> workset. Every take is bound to the exact
+/// live incarnation that prepared the frames.
+/// </summary>
+internal interface ILiveStaticPartFrameSource
+{
+    bool TryTakeLivePartFrames(
+        LiveEntityRecord record,
+        WorldEntity entity,
+        LiveEntityAnimationState animation,
+        ulong objectClockEpoch,
+        ulong projectionMutationVersion,
+        out IReadOnlyList<PartTransform> frames);
+}

src/AcDream.App/Rendering/LiveEntityAnimationPresenter.cs

@@ -0,0 +1,403 @@
+using System.Numerics;
+using AcDream.App.Rendering.Vfx;
+using AcDream.App.World;
+using AcDream.Core.Physics;
+using AcDream.Core.World;
+
+namespace AcDream.App.Rendering;
+
+/// <summary>
+/// Publishes the final visual and rigid part channels after retail object and
+/// static-animation scheduling. It advances no time and drains no hooks.
+/// </summary>
+internal sealed class LiveEntityAnimationPresenter
+{
+    private readonly Func<LiveEntityRuntime?> _liveEntities;
+    private readonly Func<ILiveStaticPartFrameSource?> _staticFrames;
+    private readonly EntityEffectPoseRegistry _effectPoses;
+    private readonly ILiveAnimationPresentationContext _context;
+    private readonly AnimationPresentationDiagnostics _diagnostics;
+    private readonly int _hidePartIndex;
+    private readonly List<LiveEntityRecord> _snapshot = new();
+
+    public LiveEntityAnimationPresenter(
+        Func<LiveEntityRuntime?> liveEntities,
+        Func<ILiveStaticPartFrameSource?> staticFrames,
+        EntityEffectPoseRegistry effectPoses,
+        ILiveAnimationPresentationContext context,
+        AnimationPresentationDiagnostics diagnostics,
+        int hidePartIndex)
+    {
+        _liveEntities = liveEntities ?? throw new ArgumentNullException(nameof(liveEntities));
+        _staticFrames = staticFrames ?? throw new ArgumentNullException(nameof(staticFrames));
+        _effectPoses = effectPoses ?? throw new ArgumentNullException(nameof(effectPoses));
+        _context = context ?? throw new ArgumentNullException(nameof(context));
+        _diagnostics = diagnostics ?? throw new ArgumentNullException(nameof(diagnostics));
+        _hidePartIndex = hidePartIndex;
+    }
+
+    public void PrepareAnimation(
+        LiveEntityRecord record,
+        LiveEntityAnimationState animation)
+    {
+        ArgumentNullException.ThrowIfNull(record);
+        ArgumentNullException.ThrowIfNull(animation);
+        LiveEntityRuntime? runtime = _liveEntities();
+        if (runtime is null
+            || !runtime.IsCurrentSpatialAnimation(record, animation)
+            || !ReferenceEquals(record.WorldEntity, animation.Entity)
+            || animation.Sequencer is not { MotionDoneTarget: null } sequencer)
+        {
+            return;
+        }
+
+        WorldEntity capturedEntity = animation.Entity;
+        sequencer.MotionDoneTarget = (motion, success) =>
+        {
+            LiveEntityRuntime? current = _liveEntities();
+            if (current is null
+                || !current.IsCurrentSpatialAnimation(record, animation)
+                || !ReferenceEquals(record.WorldEntity, capturedEntity)
+                || !ReferenceEquals(animation.Entity, capturedEntity))
+            {
+                return;
+            }
+
+            MotionInterpreter? interpreter = _context.ResolveMotionInterpreter(record);
+            interpreter?.MotionDone(motion, success);
+            if (_diagnostics.DumpMotionEnabled)
+            {
+                Console.WriteLine(
+                    $"[MOTIONDONE] guid={record.ServerGuid:X8} motion=0x{motion:X8} "
+                    + $"success={success} pending={(interpreter?.MotionsPending() ?? false)}");
+            }
+        };
+    }
+
+    public void Present(
+        IReadOnlyDictionary<uint, LiveEntityAnimationSchedule> schedules)
+    {
+        ArgumentNullException.ThrowIfNull(schedules);
+        LiveEntityRuntime? runtime = _liveEntities();
+        if (runtime is null)
+            return;
+
+        // Private snapshot: EffectPoseChanged is synchronous and may perform a
+        // nested runtime-view enumeration. Never borrow that view's scratch.
+        runtime.CopySpatialRootObjectRecordsTo(_snapshot);
+        foreach (LiveEntityRecord record in _snapshot)
+        {
+            if (!TryGetCurrent(runtime, record, out WorldEntity entity, out LiveEntityAnimationState animation))
+                continue;
+
+            PrepareAnimation(record, animation);
+            if (!TryGetCurrent(runtime, record, entity, animation))
+                continue;
+
+            schedules.TryGetValue(entity.Id, out LiveEntityAnimationSchedule schedule);
+            bool hasOrdinarySchedule = IsCurrentSchedule(runtime, schedule, record, entity, animation);
+            IReadOnlyList<PartTransform>? sequenceFrames = hasOrdinarySchedule
+                ? schedule.SequenceFrames
+                : null;
+            bool composeParts = hasOrdinarySchedule && schedule.ComposeParts;
+            float legacyAdvanceSeconds = hasOrdinarySchedule
+                ? schedule.LegacyAdvanceSeconds
+                : 0f;
+            ulong objectClockEpoch = record.ObjectClockEpoch;
+            ulong projectionVersion = record.ProjectionMutationVersion;
+
+            if (_staticFrames()?.TryTakeLivePartFrames(
+                    record,
+                    entity,
+                    animation,
+                    objectClockEpoch,
+                    projectionVersion,
+                    out IReadOnlyList<PartTransform> staticPartFrames) == true)
+            {
+                if (!TryGetCurrent(
+                        runtime,
+                        record,
+                        entity,
+                        animation,
+                        objectClockEpoch,
+                        projectionVersion))
+                {
+                    continue;
+                }
+                sequenceFrames = staticPartFrames;
+                composeParts = true;
+            }
+
+            if (animation.Sequencer is not null)
+            {
+                EmitSequenceDiagnostics(record, animation, sequenceFrames);
+            }
+            else
+            {
+                int span = animation.HighFrame - animation.LowFrame;
+                bool hiddenLegacy = (record.FinalPhysicsState & PhysicsStateFlags.Hidden) != 0;
+                if (span <= 0 && !hiddenLegacy)
+                    continue;
+                if (span > 0 && legacyAdvanceSeconds > 0f)
+                {
+                    animation.CurrFrame += legacyAdvanceSeconds * animation.Framerate;
+                    if (animation.CurrFrame > animation.HighFrame)
+                    {
+                        float over = animation.CurrFrame - animation.LowFrame;
+                        animation.CurrFrame = animation.LowFrame + (over % (span + 1));
+                    }
+                    else if (animation.CurrFrame < animation.LowFrame)
+                    {
+                        animation.CurrFrame = animation.LowFrame;
+                    }
+                }
+            }
+
+            if (!composeParts
+                || !TryGetCurrent(
+                    runtime,
+                    record,
+                    entity,
+                    animation,
+                    objectClockEpoch,
+                    projectionVersion))
+            {
+                continue;
+            }
+
+            ComposeAndPublish(runtime, record, entity, animation, sequenceFrames,
+                objectClockEpoch, projectionVersion);
+        }
+    }
+
+    private void ComposeAndPublish(
+        LiveEntityRuntime runtime,
+        LiveEntityRecord record,
+        WorldEntity entity,
+        LiveEntityAnimationState animation,
+        IReadOnlyList<PartTransform>? sequenceFrames,
+        ulong objectClockEpoch,
+        ulong projectionVersion)
+    {
+        int partCount = animation.PartTemplate.Count;
+        EmitPartDiagnostics(record, animation, sequenceFrames, partCount);
+        List<MeshRef> meshRefs = animation.MeshRefsScratch;
+        meshRefs.Clear();
+        List<Matrix4x4> rigidPoses = animation.EffectPartPosesScratch;
+        rigidPoses.Clear();
+        Matrix4x4 scale = animation.Scale == 1f
+            ? Matrix4x4.Identity
+            : Matrix4x4.CreateScale(animation.Scale);
+
+        for (int i = 0; i < partCount; i++)
+        {
+            ResolvePartFrame(animation, sequenceFrames, i, out Vector3 origin, out Quaternion orientation);
+            Vector3 defaultScale = i < animation.Setup.DefaultScale.Count
+                ? animation.Setup.DefaultScale[i]
+                : Vector3.One;
+            Matrix4x4 visual = Matrix4x4.CreateScale(defaultScale)
+                * Matrix4x4.CreateFromQuaternion(orientation)
+                * Matrix4x4.CreateTranslation(origin);
+            if (animation.Scale != 1f)
+                visual *= scale;
+
+            Matrix4x4 rigid = Matrix4x4.CreateFromQuaternion(orientation)
+                * Matrix4x4.CreateTranslation(origin * animation.Scale);
+            rigidPoses.Add(rigid);
+
+            LiveAnimationPartTemplate template = animation.PartTemplate[i];
+            if (!template.IsDrawable
+                || (_hidePartIndex >= 0 && i == _hidePartIndex && partCount >= 10))
+            {
+                continue;
+            }
+            meshRefs.Add(new MeshRef(template.GfxObjId, visual)
+            {
+                SurfaceOverrides = template.SurfaceOverrides,
+            });
+        }
+
+        if (!TryGetCurrent(runtime, record, entity, animation, objectClockEpoch, projectionVersion))
+            return;
+        entity.MeshRefs = meshRefs;
+        entity.SetIndexedPartPoses(rigidPoses, animation.PartAvailability);
+        if (!TryGetCurrent(runtime, record, entity, animation, objectClockEpoch, projectionVersion))
+            return;
+        _effectPoses.Publish(entity, rigidPoses, animation.PartAvailability);
+    }
+
+    private static void ResolvePartFrame(
+        LiveEntityAnimationState animation,
+        IReadOnlyList<PartTransform>? sequenceFrames,
+        int partIndex,
+        out Vector3 origin,
+        out Quaternion orientation)
+    {
+        if (sequenceFrames is not null)
+        {
+            if (partIndex < sequenceFrames.Count)
+            {
+                origin = sequenceFrames[partIndex].Origin;
+                orientation = sequenceFrames[partIndex].Orientation;
+            }
+            else
+            {
+                origin = Vector3.Zero;
+                orientation = Quaternion.Identity;
+            }
+            return;
+        }
+
+        int frameIndex = (int)Math.Floor(animation.CurrFrame);
+        if (frameIndex < animation.LowFrame
+            || frameIndex > animation.HighFrame
+            || frameIndex >= animation.Animation.PartFrames.Count)
+        {
+            frameIndex = animation.LowFrame;
+        }
+        int nextIndex = frameIndex + 1;
+        if (nextIndex > animation.HighFrame
+            || nextIndex >= animation.Animation.PartFrames.Count)
+        {
+            nextIndex = animation.LowFrame;
+        }
+        float t = Math.Clamp(animation.CurrFrame - frameIndex, 0f, 1f);
+        var frames = animation.Animation.PartFrames[frameIndex].Frames;
+        var nextFrames = animation.Animation.PartFrames[nextIndex].Frames;
+        if (partIndex < frames.Count)
+        {
+            var first = frames[partIndex];
+            var next = partIndex < nextFrames.Count ? nextFrames[partIndex] : first;
+            origin = Vector3.Lerp(first.Origin, next.Origin, t);
+            orientation = Quaternion.Slerp(first.Orientation, next.Orientation, t);
+        }
+        else
+        {
+            origin = Vector3.Zero;
+            orientation = Quaternion.Identity;
+        }
+    }
+
+    private void EmitSequenceDiagnostics(
+        LiveEntityRecord record,
+        LiveEntityAnimationState animation,
+        IReadOnlyList<PartTransform>? sequenceFrames)
+    {
+        if (!_diagnostics.RemoteVelocityEnabled
+            || record.ServerGuid == 0
+            || record.ServerGuid == _context.LocalPlayerGuid
+            || record.RemoteMotionRuntime is null)
+        {
+            return;
+        }
+        double now = _diagnostics.Now();
+        if (now - animation.LastSequenceDiagnosticTime <= 1d)
+            return;
+        AnimationSequencer sequencer = animation.Sequencer!;
+        Console.WriteLine(
+            $"[SEQSTATE] guid={record.ServerGuid:X8} CurrentMotion=0x{sequencer.CurrentMotion:X8} "
+            + $"CurrentSpeedMod={sequencer.CurrentSpeedMod:F3}");
+        var node = sequencer.CurrentNodeDiag;
+        int firstHash = sequencer.FirstCyclicAnimRefHash;
+        Console.WriteLine(
+            $"[CURRNODE] guid={record.ServerGuid:X8} animRef=0x{node.AnimRefHash:X8} "
+            + $"firstCyclicAnimRef=0x{firstHash:X8} "
+            + $"isOnCyclic={node.AnimRefHash == firstHash && firstHash != 0} "
+            + $"isLooping={node.IsLooping} fr={node.Framerate:F2} "
+            + $"frame=[{node.StartFrame}..{node.EndFrame}] "
+            + $"pos={node.FramePosition:F2} qCount={node.QueueCount}");
+        animation.LastSequenceDiagnosticTime = now;
+    }
+
+    private void EmitPartDiagnostics(
+        LiveEntityRecord record,
+        LiveEntityAnimationState animation,
+        IReadOnlyList<PartTransform>? sequenceFrames,
+        int partCount)
+    {
+        if (!_diagnostics.RemoteVelocityEnabled
+            || record.ServerGuid == 0
+            || record.ServerGuid == _context.LocalPlayerGuid
+            || record.RemoteMotionRuntime is null)
+        {
+            return;
+        }
+        double now = _diagnostics.Now();
+        if (now - animation.LastPartDiagnosticTime <= 1d)
+            return;
+        int animationPartCount = animation.Animation is not null
+            && animation.Animation.PartFrames.Count > 0
+                ? animation.Animation.PartFrames[0].Frames.Count
+                : -1;
+        double hash = 0d;
+        if (sequenceFrames is not null)
+        {
+            foreach (PartTransform frame in sequenceFrames)
+            {
+                hash += frame.Origin.X + frame.Origin.Y + frame.Origin.Z
+                    + frame.Orientation.X + frame.Orientation.Y
+                    + frame.Orientation.Z + frame.Orientation.W;
+            }
+        }
+        Console.WriteLine(
+            $"[PARTSDIAG] guid={record.ServerGuid:X8} pt.Count={partCount} "
+            + $"seqFrames.Count={sequenceFrames?.Count ?? -1} "
+            + $"setup.Parts.Count={animation.Setup.Parts.Count} "
+            + $"anim.PartFrames[0].Frames.Count={animationPartCount} seqHash={hash:F4}");
+        animation.LastPartDiagnosticTime = now;
+    }
+
+    private static bool IsCurrentSchedule(
+        LiveEntityRuntime runtime,
+        LiveEntityAnimationSchedule schedule,
+        LiveEntityRecord record,
+        WorldEntity entity,
+        LiveEntityAnimationState animation) =>
+        schedule.ComposeParts
+        && ReferenceEquals(schedule.Record, record)
+        && ReferenceEquals(schedule.Entity, entity)
+        && ReferenceEquals(schedule.Animation, animation)
+        && TryGetCurrent(
+            runtime,
+            record,
+            entity,
+            animation,
+            schedule.ObjectClockEpoch,
+            schedule.ProjectionMutationVersion);
+
+    private static bool TryGetCurrent(
+        LiveEntityRuntime runtime,
+        LiveEntityRecord record,
+        out WorldEntity entity,
+        out LiveEntityAnimationState animation)
+    {
+        WorldEntity? currentEntity = record.WorldEntity;
+        LiveEntityAnimationState? currentAnimation =
+            record.AnimationRuntime as LiveEntityAnimationState;
+        entity = currentEntity!;
+        animation = currentAnimation!;
+        return currentEntity is not null
+            && currentAnimation is not null
+            && TryGetCurrent(runtime, record, entity, animation);
+    }
+
+    private static bool TryGetCurrent(
+        LiveEntityRuntime runtime,
+        LiveEntityRecord record,
+        WorldEntity entity,
+        LiveEntityAnimationState animation) =>
+        runtime.IsCurrentSpatialAnimation(record, animation)
+        && ReferenceEquals(record.WorldEntity, entity)
+        && ReferenceEquals(animation.Entity, entity);
+
+    private static bool TryGetCurrent(
+        LiveEntityRuntime runtime,
+        LiveEntityRecord record,
+        WorldEntity entity,
+        LiveEntityAnimationState animation,
+        ulong objectClockEpoch,
+        ulong projectionVersion) =>
+        TryGetCurrent(runtime, record, entity, animation)
+        && record.ObjectClockEpoch == objectClockEpoch
+        && record.ProjectionMutationVersion == projectionVersion;
+}

src/AcDream.App/Rendering/LiveEntityAnimationScheduler.cs

@@ -5,7 +5,6 @@ using AcDream.Core.Physics;
 using AcDream.Core.Physics.Motion;
 using AcDream.Core.World;
 using DatReaderWriter.Types;
-using AnimatedEntity = AcDream.App.Rendering.GameWindow.AnimatedEntity;
 using RemoteMotion = AcDream.App.Rendering.GameWindow.RemoteMotion;
 
 namespace AcDream.App.Rendering;
@@ -67,7 +66,7 @@ internal sealed class LiveEntityAnimationScheduler
         bool localHiddenPartPoseDirty,
         int liveCenterX,
         int liveCenterY,
-        Action<uint, AnimatedEntity>? prepareAnimation = null)
+        Action<LiveEntityRecord, LiveEntityAnimationState>? prepareAnimation = null)
     {
         _schedules.Clear();
         LiveEntityRuntime? runtime = _liveEntities();
@@ -83,14 +82,12 @@ internal sealed class LiveEntityAnimationScheduler
                 continue;
             }
 
-            AnimatedEntity? animation = record.AnimationRuntime as AnimatedEntity;
+            LiveEntityAnimationState? animation = record.AnimationRuntime as LiveEntityAnimationState;
             RemoteMotion? remote = record.RemoteMotionRuntime as RemoteMotion;
             ProjectileController.Runtime? projectile =
                 record.ProjectileRuntime as ProjectileController.Runtime;
             ulong objectClockEpoch = record.ObjectClockEpoch;
 
-            if (animation is not null)
-                prepareAnimation?.Invoke(record.ServerGuid, animation);
             if (!IsCurrent(
                     runtime,
                     record,
@@ -101,6 +98,22 @@ internal sealed class LiveEntityAnimationScheduler
                     objectClockEpoch))
                 continue;
 
+            if (animation is not null)
+            {
+                prepareAnimation?.Invoke(record, animation);
+                if (!IsCurrent(
+                        runtime,
+                        record,
+                        entity,
+                        animation,
+                        remote,
+                        projectile,
+                        objectClockEpoch))
+                {
+                    continue;
+                }
+            }
+
             LiveEntityAnimationSchedule schedule = AdvanceRecord(
                 runtime,
                 record,
@@ -126,7 +139,14 @@ internal sealed class LiveEntityAnimationScheduler
                     projectile,
                     objectClockEpoch))
             {
-                _schedules[entity.Id] = schedule;
+                _schedules[entity.Id] = schedule with
+                {
+                    Record = record,
+                    Entity = entity,
+                    Animation = animation,
+                    ObjectClockEpoch = objectClockEpoch,
+                    ProjectionMutationVersion = record.ProjectionMutationVersion,
+                };
             }
         }
 
@@ -137,7 +157,7 @@ internal sealed class LiveEntityAnimationScheduler
         LiveEntityRuntime runtime,
         LiveEntityRecord record,
         WorldEntity entity,
-        AnimatedEntity? animation,
+        LiveEntityAnimationState? animation,
         RemoteMotion? remote,
         ProjectileController.Runtime? projectile,
         float elapsedSeconds,
@@ -472,7 +492,7 @@ internal sealed class LiveEntityAnimationScheduler
         LiveEntityRuntime runtime,
         LiveEntityRecord record,
         WorldEntity entity,
-        AnimatedEntity? animation,
+        LiveEntityAnimationState? animation,
         RemoteMotion? remote,
         ProjectileController.Runtime? projectile,
         ulong objectClockEpoch) =>
@@ -506,4 +526,9 @@ internal sealed class LiveEntityAnimationScheduler
 internal readonly record struct LiveEntityAnimationSchedule(
     IReadOnlyList<PartTransform>? SequenceFrames,
     float LegacyAdvanceSeconds,
-    bool ComposeParts);
+    bool ComposeParts,
+    LiveEntityRecord? Record = null,
+    WorldEntity? Entity = null,
+    LiveEntityAnimationState? Animation = null,
+    ulong ObjectClockEpoch = 0UL,
+    ulong ProjectionMutationVersion = 0UL);

src/AcDream.App/Rendering/LiveEntityAnimationState.cs

@@ -0,0 +1,63 @@
+using System.Numerics;
+using AcDream.App.World;
+using AcDream.Core.Physics;
+using AcDream.Core.Physics.Motion;
+using AcDream.Core.World;
+using DatReaderWriter.DBObjs;
+using DatReaderWriter.Types;
+
+namespace AcDream.App.Rendering;
+
+/// <summary>
+/// Incarnation-owned live <c>CPartArray</c> presentation state. Time, root
+/// motion, and hooks remain owned by <see cref="LiveEntityAnimationScheduler"/>;
+/// this component retains the final part-presentation channels only.
+/// </summary>
+internal sealed class LiveEntityAnimationState : ILiveEntityAnimationRuntime
+{
+    public required WorldEntity Entity;
+    WorldEntity ILiveEntityAnimationRuntime.Entity => Entity;
+    uint ILiveEntityAnimationRuntime.CurrentMotion => Sequencer?.CurrentMotion ?? 0u;
+
+    public required Setup Setup;
+    public required Animation Animation;
+    public required int LowFrame;
+    public required int HighFrame;
+    public required float Framerate;
+    public required float Scale;
+    public required IReadOnlyList<LiveAnimationPartTemplate> PartTemplate;
+    public required IReadOnlyList<bool> PartAvailability;
+    public float CurrFrame;
+    public AnimationSequencer? Sequencer;
+
+    public IReadOnlyList<PartTransform>? PreparedSequenceFrames;
+    public bool SequenceAdvancedBeforeAnimationPass;
+    public readonly Frame RootMotionScratch = new();
+    public readonly MotionDeltaFrame RootMotionDeltaScratch = new();
+
+    /// <summary>Reusable compact drawable channel, consumed before draw.</summary>
+    public readonly List<MeshRef> MeshRefsScratch = new();
+    /// <summary>Reusable indexed rigid/effect channel.</summary>
+    public readonly List<Matrix4x4> EffectPartPosesScratch = new();
+    /// <summary>
+    /// Indexed visible transforms retained separately from the rigid channel
+    /// because Setup DefaultScale affects geometry but not attachments.
+    /// </summary>
+    public readonly List<Matrix4x4> VisualPartPosesScratch = new();
+    public bool PresentationPosesInitialized;
+
+    public double LastSequenceDiagnosticTime;
+    public double LastPartDiagnosticTime;
+
+    public void InvalidatePresentationPoses()
+    {
+        PresentationPosesInitialized = false;
+        VisualPartPosesScratch.Clear();
+        EffectPartPosesScratch.Clear();
+    }
+}
+
+internal readonly record struct LiveAnimationPartTemplate(
+    uint GfxObjId,
+    IReadOnlyDictionary<uint, uint>? SurfaceOverrides,
+    bool IsDrawable);

src/AcDream.App/Rendering/RetailStaticAnimatingObjectScheduler.cs

@@ -1,5 +1,6 @@
 using System.Numerics;
 using AcDream.App.Rendering.Vfx;
+using AcDream.App.World;
 using AcDream.Core.Physics;
 using AcDream.Core.Physics.Motion;
 using AcDream.Core.World;
@@ -17,7 +18,7 @@ namespace AcDream.App.Rendering;
 /// resource lifetime. Setup default installation itself is unconditional and
 /// belongs to PartArray construction; this class owns only the Static workset.
 /// </summary>
-internal sealed class RetailStaticAnimatingObjectScheduler
+internal sealed class RetailStaticAnimatingObjectScheduler : ILiveStaticPartFrameSource
 {
     private const double FrameEpsilon = 0.000199999995;
     private const float MaximumElapsed = 2f;
@@ -162,10 +163,24 @@ internal sealed class RetailStaticAnimatingObjectScheduler
     /// the single owner of mesh identity, overrides, and appearance rebinding.
     /// </summary>
     public bool TryTakeLivePartFrames(
-        uint ownerId,
+        LiveEntityRecord record,
+        WorldEntity entity,
+        LiveEntityAnimationState animation,
+        ulong objectClockEpoch,
+        ulong projectionMutationVersion,
         out IReadOnlyList<PartTransform> frames)
     {
+        ArgumentNullException.ThrowIfNull(record);
+        ArgumentNullException.ThrowIfNull(entity);
+        ArgumentNullException.ThrowIfNull(animation);
+        uint ownerId = entity.Id;
         if (_owners.TryGetValue(ownerId, out Owner? owner)
+            && ReferenceEquals(record.WorldEntity, entity)
+            && ReferenceEquals(record.AnimationRuntime, animation)
+            && record.ObjectClockEpoch == objectClockEpoch
+            && record.ProjectionMutationVersion == projectionMutationVersion
+            && ReferenceEquals(owner.Entity, entity)
+            && ReferenceEquals(owner.Sequencer, animation.Sequencer)
             && owner.Entity.ServerGuid != 0
             && owner.PreparedLivePartFrames is { } prepared
             && IsResidentAtVersion(owner, owner.PendingResidencyVersion))
@@ -182,6 +197,29 @@ internal sealed class RetailStaticAnimatingObjectScheduler
         return false;
     }
 
+    /// <summary>
+    /// Scheduler-only test seam for DAT/static timing tests which deliberately
+    /// do not construct a <see cref="LiveEntityRuntime"/>. Runtime integration
+    /// must use the exact-incarnation overload above.
+    /// </summary>
+    internal bool TryTakePreparedFramesForTest(
+        uint ownerId,
+        out IReadOnlyList<PartTransform> frames)
+    {
+        if (_owners.TryGetValue(ownerId, out Owner? owner)
+            && owner.PreparedLivePartFrames is { } prepared
+            && IsResidentAtVersion(owner, owner.PendingResidencyVersion))
+        {
+            owner.PreparedLivePartFrames = null;
+            frames = prepared;
+            return true;
+        }
+        if (_owners.TryGetValue(ownerId, out owner))
+            InvalidatePending(owner);
+        frames = Array.Empty<PartTransform>();
+        return false;
+    }
+
     public void Unregister(uint ownerId) => _owners.Remove(ownerId);
 
     public void CopyAnimatedEntityIdsTo(HashSet<uint> destination)