feat(rendering): index incremental scene queries

Maintain packed render worksets as lifecycle deltas arrive and synchronize active animated statics without scanning the resident world. This keeps Slice F non-drawing while preparing exact spatial and feature queries for shadow comparison.

Release: 8,206 passed, 5 skipped.

docs/plans/2026-07-24-modern-runtime-slices-f-g-render-scene.md

@@ -21,8 +21,8 @@ retail-faithful gameplay
 | F1 — scene types and contained adapter | complete | `Arch 2.1.0` is pinned in App only behind acdream contracts. Five narrow archetypes, generation/incarnation/sequence gates, borrowed-query invalidation, memory accounting, deterministic digesting, and update-thread enforcement pass 11 focused tests. Release gate: 3,701 App tests / 3 skips and 8,185 complete-solution tests / 5 skips. |
 | F2 — static projection journal | complete | Static and EnvCell-shell projections now append ordered deltas only after the final activation receipt and exact detach receipt. Same-landblock rehydrate reconciles retained/new/omitted identities; stale Far completions are inert. Seven focused lifecycle tests pass inside the 3,708-App / 8,192-solution Release gate. The scene remains unconstructed and non-drawing in production. |
 | F3 — live/equipped projection | complete | Exact EntityReady/resource teardown, visibility, attachment pose/removal, and active-only final-frame seams now drive generation/incarnation-gated live records. Duplicate CreateObject, pending/loaded rebucket, hidden/appearance, reentrancy, session clear, attachment, and GUID-generation replacement pass 11 focused tests. Production still constructs no render scene. |
-| F4 — dynamic indices | active | Packed spatial/class/visibility query indices have not landed. |
-| F5 | pending | Continuous shadow comparison has not started. |
+| F4 — dynamic indices | complete | The contained scene now maintains outdoor/static, per-cell static/dynamic, special dynamic-route, translucent, selectable, light-candidate, and dirty indices incrementally. Final-frame live/equipped synchronization remains active-only, and active animated statics are synchronized from the scheduler's active workset rather than a resident-world scan. The production scene remains unconstructed and non-drawing. |
+| F5 | active | Continuous lifecycle-automation shadow comparison is the next unit; no production consumer has switched. |
 | G0–G5 | pending | No production consumer has switched. |
 
 The exact pre-F/G runtime rollback anchor remains `e7d9d6fa`. F0 is

src/AcDream.App/Rendering/RetailStaticAnimatingObjectScheduler.cs

@@ -334,6 +334,21 @@ internal sealed class RetailStaticAnimatingObjectScheduler : ILiveStaticPartFram
         }
     }
 
+    internal void CopyActiveDatStaticEntitiesTo(List<WorldEntity> destination)
+    {
+        ArgumentNullException.ThrowIfNull(destination);
+        destination.Clear();
+        foreach (Owner owner in _owners.Values)
+        {
+            if (owner.Entity.ServerGuid == 0
+                && owner.Sequencer is not null
+                && _isResident(owner.Entity))
+            {
+                destination.Add(owner.Entity);
+            }
+        }
+    }
+
     public void Tick(float elapsedSeconds)
     {
         if (!float.IsFinite(elapsedSeconds)

src/AcDream.App/Rendering/Scene/Arch/ArchRenderScene.cs

@@ -1,4 +1,5 @@
 using System.Runtime.CompilerServices;
+using AcDream.App.Rendering;
 using Arch.Core;
 using ArchWorld = Arch.Core.World;
 
@@ -18,6 +19,19 @@ internal sealed class ArchRenderScene : IRenderScene, IRenderSceneQuerySource
 
     private readonly int _ownerThreadId;
     private readonly Dictionary<RenderProjectionId, SceneEntry> _entries = [];
+    private readonly HashSet<RenderProjectionId> _outdoorStatics = [];
+    private readonly HashSet<RenderProjectionId> _indoorCellStatics = [];
+    private readonly HashSet<RenderProjectionId> _dynamics = [];
+    private readonly HashSet<RenderProjectionId> _outdoorDynamics = [];
+    private readonly HashSet<RenderProjectionId> _portalStraddlingDynamics = [];
+    private readonly HashSet<RenderProjectionId> _translucent = [];
+    private readonly HashSet<RenderProjectionId> _selectable = [];
+    private readonly HashSet<RenderProjectionId> _lightCandidates = [];
+    private readonly HashSet<RenderProjectionId> _dirty = [];
+    private readonly Dictionary<uint, HashSet<RenderProjectionId>>
+        _cellStatics = [];
+    private readonly Dictionary<uint, HashSet<RenderProjectionId>>
+        _cellDynamics = [];
     private ArchWorld _world;
     private RenderProjectionCounts _counts;
     private ulong _lastAppliedJournalSequence;
@@ -59,6 +73,7 @@ internal sealed class ArchRenderScene : IRenderScene, IRenderSceneQuerySource
             int lookupCapacity = _entries.EnsureCapacity(0);
             long lookupBytes =
                 (long)lookupCapacity * Unsafe.SizeOf<ProjectionLookupSlotEstimate>();
+            long indexBytes = EstimateIndexBytes();
 
             return new RenderSceneMemoryAccounting(
                 EntityCount: _world.Size,
@@ -68,7 +83,7 @@ internal sealed class ArchRenderScene : IRenderScene, IRenderSceneQuerySource
                 EstimatedChunkPayloadBytes: estimatedChunkPayloadBytes,
                 ProjectionLookupCapacity: lookupCapacity,
                 EstimatedProjectionLookupBytes: lookupBytes,
-                EstimatedIndexBytes: 0,
+                EstimatedIndexBytes: indexBytes,
                 EstimatedJournalBufferBytes: 0,
                 EstimatedSynchronizationSourceBytes: 0);
         }
@@ -158,6 +173,7 @@ internal sealed class ArchRenderScene : IRenderScene, IRenderSceneQuerySource
             ref RenderDirtyMask dirty =
                 ref _world.Get<RenderDirtyMask>(entry.Entity);
             dirty |= RenderDirtyMask.Transform | RenderDirtyMask.WorldBounds;
+            _dirty.Add(update.Id);
         }
     }
 
@@ -205,6 +221,7 @@ internal sealed class ArchRenderScene : IRenderScene, IRenderSceneQuerySource
         ArchWorld.Destroy(_world);
         _world = CreateWorld();
         _entries.Clear();
+        ClearIndices();
         _counts = default;
         _lastAppliedJournalSequence = 0;
         Generation = replacementGeneration;
@@ -218,10 +235,22 @@ internal sealed class ArchRenderScene : IRenderScene, IRenderSceneQuerySource
         EnsureMutationThread();
         ArchWorld.Destroy(_world);
         _entries.Clear();
+        ClearIndices();
         _counts = default;
         _disposed = true;
     }
 
+    public void ClearDirty()
+    {
+        EnsureMutationThread();
+        foreach (RenderProjectionId id in _dirty)
+        {
+            if (_entries.TryGetValue(id, out SceneEntry entry))
+                _world.Set(entry.Entity, RenderDirtyMask.None);
+        }
+        _dirty.Clear();
+    }
+
     RenderProjectionCounts IRenderSceneQuerySource.GetCounts(
         RenderSceneGeneration generation)
     {
@@ -229,6 +258,22 @@ internal sealed class ArchRenderScene : IRenderScene, IRenderSceneQuerySource
         return _counts;
     }
 
+    RenderSceneIndexCounts IRenderSceneQuerySource.GetIndexCounts(
+        RenderSceneGeneration generation)
+    {
+        EnsureQueryGeneration(generation);
+        return new RenderSceneIndexCounts(
+            _outdoorStatics.Count,
+            _indoorCellStatics.Count,
+            _dynamics.Count,
+            _outdoorDynamics.Count,
+            _portalStraddlingDynamics.Count,
+            _translucent.Count,
+            _selectable.Count,
+            _lightCandidates.Count,
+            _dirty.Count);
+    }
+
     bool IRenderSceneQuerySource.TryGet(
         RenderSceneGeneration generation,
         RenderProjectionId id,
@@ -276,6 +321,41 @@ internal sealed class ArchRenderScene : IRenderScene, IRenderSceneQuerySource
         return count;
     }
 
+    int IRenderSceneQuerySource.CopyIndexTo(
+        RenderSceneGeneration generation,
+        RenderSceneIndex index,
+        Span<RenderProjectionRecord> destination)
+    {
+        EnsureQueryGeneration(generation);
+        HashSet<RenderProjectionId> source = Index(index);
+        return CopyIdsTo(source, destination);
+    }
+
+    int IRenderSceneQuerySource.GetCellCount(
+        RenderSceneGeneration generation,
+        uint fullCellId,
+        bool dynamic)
+    {
+        EnsureQueryGeneration(generation);
+        Dictionary<uint, HashSet<RenderProjectionId>> index =
+            dynamic ? _cellDynamics : _cellStatics;
+        return index.TryGetValue(fullCellId, out var ids) ? ids.Count : 0;
+    }
+
+    int IRenderSceneQuerySource.CopyCellTo(
+        RenderSceneGeneration generation,
+        uint fullCellId,
+        bool dynamic,
+        Span<RenderProjectionRecord> destination)
+    {
+        EnsureQueryGeneration(generation);
+        Dictionary<uint, HashSet<RenderProjectionId>> index =
+            dynamic ? _cellDynamics : _cellStatics;
+        return index.TryGetValue(fullCellId, out var ids)
+            ? CopyIdsTo(ids, destination)
+            : 0;
+    }
+
     private static ArchWorld CreateWorld() =>
         ArchWorld.Create(
             archetypeCapacity: InitialArchetypeCapacity,
@@ -298,7 +378,9 @@ internal sealed class ArchRenderScene : IRenderScene, IRenderSceneQuerySource
             if (incarnationOrder == 0
                 && record.ProjectionClass == existing.ProjectionClass)
             {
+                RenderProjectionRecord prior = ReadRecord(in existing);
                 WriteRecord(existing.Entity, in record);
+                UpdateIndices(in prior, in record);
                 result.Applied++;
                 result.Updated++;
                 return;
@@ -314,6 +396,7 @@ internal sealed class ArchRenderScene : IRenderScene, IRenderSceneQuerySource
             record.OwnerIncarnation,
             record.ProjectionClass);
         IncrementCount(record.ProjectionClass);
+        AddToIndices(in record);
         result.Applied++;
         result.Registered++;
     }
@@ -326,6 +409,7 @@ internal sealed class ArchRenderScene : IRenderScene, IRenderSceneQuerySource
         if (!TryGetCurrent(in record, ref result, out SceneEntry entry))
             return;
 
+        RenderProjectionRecord prior = ReadRecord(in entry);
         switch (kind)
         {
             case RenderProjectionDeltaKind.UpdateTransform:
@@ -336,6 +420,7 @@ internal sealed class ArchRenderScene : IRenderScene, IRenderSceneQuerySource
                 _world.Set(entry.Entity, record.Source);
                 OrDirty(
                     entry.Entity,
+                    record.Id,
                     RenderDirtyMask.Transform
                     | RenderDirtyMask.WorldBounds
                     | RenderDirtyMask.SortKey);
@@ -345,22 +430,30 @@ internal sealed class ArchRenderScene : IRenderScene, IRenderSceneQuerySource
                 _world.Set(entry.Entity, record.Material);
                 _world.Set(entry.Entity, record.DegradeState);
                 _world.Set(entry.Entity, record.Source);
-                OrDirty(entry.Entity, RenderDirtyMask.Appearance);
+                OrDirty(
+                    entry.Entity,
+                    record.Id,
+                    RenderDirtyMask.Appearance);
                 break;
             case RenderProjectionDeltaKind.UpdateFlags:
                 _world.Set(entry.Entity, record.Flags);
                 _world.Set(entry.Entity, record.Source);
-                OrDirty(entry.Entity, RenderDirtyMask.Flags);
+                OrDirty(entry.Entity, record.Id, RenderDirtyMask.Flags);
                 break;
             case RenderProjectionDeltaKind.Rebucket:
                 _world.Set(entry.Entity, record.Residency);
                 _world.Set(entry.Entity, record.Source);
-                OrDirty(entry.Entity, RenderDirtyMask.SpatialResidency);
+                OrDirty(
+                    entry.Entity,
+                    record.Id,
+                    RenderDirtyMask.SpatialResidency);
                 break;
             default:
                 throw new ArgumentOutOfRangeException(nameof(kind), kind, null);
         }
 
+        RenderProjectionRecord current = ReadRecord(in entry);
+        UpdateIndices(in prior, in current);
         result.Applied++;
         result.Updated++;
     }
@@ -474,14 +567,196 @@ internal sealed class ArchRenderScene : IRenderScene, IRenderSceneQuerySource
 
     private void Destroy(in SceneEntry entry)
     {
+        RenderProjectionRecord record = ReadRecord(in entry);
+        RemoveFromIndices(in record);
         _world.Destroy(entry.Entity);
         DecrementCount(entry.ProjectionClass);
     }
 
-    private void OrDirty(Entity entity, RenderDirtyMask value)
+    private void OrDirty(
+        Entity entity,
+        RenderProjectionId id,
+        RenderDirtyMask value)
     {
         ref RenderDirtyMask dirty = ref _world.Get<RenderDirtyMask>(entity);
         dirty |= value;
+        _dirty.Add(id);
+    }
+
+    private void UpdateIndices(
+        in RenderProjectionRecord prior,
+        in RenderProjectionRecord current)
+    {
+        RemoveFromIndices(in prior);
+        AddToIndices(in current);
+    }
+
+    private void AddToIndices(in RenderProjectionRecord record)
+    {
+        bool dynamic = IsDynamic(record.ProjectionClass);
+        bool staticProjection = !dynamic;
+        bool indoor = InteriorEntityPartition.IsIndoorCellId(
+            record.Source.ParentCellId == 0
+                ? null
+                : record.Source.ParentCellId);
+
+        if (staticProjection)
+        {
+            if (indoor)
+            {
+                _indoorCellStatics.Add(record.Id);
+                AddCell(_cellStatics, record.Residency.FullCellId, record.Id);
+            }
+            else
+            {
+                _outdoorStatics.Add(record.Id);
+            }
+        }
+        else
+        {
+            _dynamics.Add(record.Id);
+            if (indoor)
+                AddCell(_cellDynamics, record.Residency.FullCellId, record.Id);
+            else
+                _outdoorDynamics.Add(record.Id);
+            if ((record.Flags & RenderProjectionFlags.PortalStraddling) != 0)
+                _portalStraddlingDynamics.Add(record.Id);
+        }
+
+        if ((record.Flags & RenderProjectionFlags.Translucent) != 0)
+            _translucent.Add(record.Id);
+        if ((record.Flags & RenderProjectionFlags.Selectable) != 0)
+            _selectable.Add(record.Id);
+        if ((record.Flags & RenderProjectionFlags.LightCandidate) != 0)
+            _lightCandidates.Add(record.Id);
+        if (record.DirtyMask != RenderDirtyMask.None)
+            _dirty.Add(record.Id);
+    }
+
+    private void RemoveFromIndices(in RenderProjectionRecord record)
+    {
+        _outdoorStatics.Remove(record.Id);
+        _indoorCellStatics.Remove(record.Id);
+        _dynamics.Remove(record.Id);
+        _outdoorDynamics.Remove(record.Id);
+        _portalStraddlingDynamics.Remove(record.Id);
+        _translucent.Remove(record.Id);
+        _selectable.Remove(record.Id);
+        _lightCandidates.Remove(record.Id);
+        _dirty.Remove(record.Id);
+        RemoveCell(_cellStatics, record.Residency.FullCellId, record.Id);
+        RemoveCell(_cellDynamics, record.Residency.FullCellId, record.Id);
+    }
+
+    private static bool IsDynamic(RenderProjectionClass projectionClass) =>
+        projectionClass is RenderProjectionClass.LiveDynamicRoot
+            or RenderProjectionClass.EquippedChild;
+
+    private static void AddCell(
+        Dictionary<uint, HashSet<RenderProjectionId>> index,
+        uint fullCellId,
+        RenderProjectionId id)
+    {
+        if (fullCellId == 0)
+            return;
+        if (!index.TryGetValue(fullCellId, out HashSet<RenderProjectionId>? ids))
+        {
+            ids = [];
+            index.Add(fullCellId, ids);
+        }
+        ids.Add(id);
+    }
+
+    private static void RemoveCell(
+        Dictionary<uint, HashSet<RenderProjectionId>> index,
+        uint fullCellId,
+        RenderProjectionId id)
+    {
+        if (!index.TryGetValue(fullCellId, out HashSet<RenderProjectionId>? ids))
+            return;
+        ids.Remove(id);
+        if (ids.Count == 0)
+            index.Remove(fullCellId);
+    }
+
+    private HashSet<RenderProjectionId> Index(RenderSceneIndex index) =>
+        index switch
+        {
+            RenderSceneIndex.OutdoorStatic => _outdoorStatics,
+            RenderSceneIndex.IndoorCellStatic => _indoorCellStatics,
+            RenderSceneIndex.Dynamic => _dynamics,
+            RenderSceneIndex.OutdoorDynamic => _outdoorDynamics,
+            RenderSceneIndex.PortalStraddlingDynamic =>
+                _portalStraddlingDynamics,
+            RenderSceneIndex.Translucent => _translucent,
+            RenderSceneIndex.Selectable => _selectable,
+            RenderSceneIndex.LightCandidate => _lightCandidates,
+            RenderSceneIndex.Dirty => _dirty,
+            _ => throw new ArgumentOutOfRangeException(
+                nameof(index),
+                index,
+                null),
+        };
+
+    private int CopyIdsTo(
+        HashSet<RenderProjectionId> source,
+        Span<RenderProjectionRecord> destination)
+    {
+        if (destination.Length < source.Count)
+        {
+            throw new ArgumentException(
+                $"Destination holds {destination.Length} records; {source.Count} required.",
+                nameof(destination));
+        }
+
+        int count = 0;
+        foreach (RenderProjectionId id in source)
+        {
+            if (!_entries.TryGetValue(id, out SceneEntry entry))
+            {
+                throw new InvalidOperationException(
+                    $"Render index retained missing {id}.");
+            }
+            destination[count++] = ReadRecord(in entry);
+        }
+        return count;
+    }
+
+    private long EstimateIndexBytes()
+    {
+        long slots =
+            _outdoorStatics.EnsureCapacity(0)
+            + _indoorCellStatics.EnsureCapacity(0)
+            + _dynamics.EnsureCapacity(0)
+            + _outdoorDynamics.EnsureCapacity(0)
+            + _portalStraddlingDynamics.EnsureCapacity(0)
+            + _translucent.EnsureCapacity(0)
+            + _selectable.EnsureCapacity(0)
+            + _lightCandidates.EnsureCapacity(0)
+            + _dirty.EnsureCapacity(0);
+        foreach (HashSet<RenderProjectionId> ids in _cellStatics.Values)
+            slots += ids.EnsureCapacity(0);
+        foreach (HashSet<RenderProjectionId> ids in _cellDynamics.Values)
+            slots += ids.EnsureCapacity(0);
+        long cellLookupSlots =
+            _cellStatics.EnsureCapacity(0)
+            + _cellDynamics.EnsureCapacity(0);
+        return checked(slots * 24L + cellLookupSlots * 40L);
+    }
+
+    private void ClearIndices()
+    {
+        _outdoorStatics.Clear();
+        _indoorCellStatics.Clear();
+        _dynamics.Clear();
+        _outdoorDynamics.Clear();
+        _portalStraddlingDynamics.Clear();
+        _translucent.Clear();
+        _selectable.Clear();
+        _lightCandidates.Clear();
+        _dirty.Clear();
+        _cellStatics.Clear();
+        _cellDynamics.Clear();
     }
 
     private void IncrementCount(RenderProjectionClass projectionClass)

src/AcDream.App/Rendering/Scene/RenderSceneContracts.cs

@@ -304,6 +304,50 @@ internal readonly record struct RenderProjectionCounts(
         };
 }
 
+internal enum RenderSceneIndex : byte
+{
+    OutdoorStatic,
+    IndoorCellStatic,
+    Dynamic,
+    OutdoorDynamic,
+    PortalStraddlingDynamic,
+    Translucent,
+    Selectable,
+    LightCandidate,
+    Dirty,
+}
+
+internal readonly record struct RenderSceneIndexCounts(
+    int OutdoorStatic,
+    int IndoorCellStatic,
+    int Dynamic,
+    int OutdoorDynamic,
+    int PortalStraddlingDynamic,
+    int Translucent,
+    int Selectable,
+    int LightCandidate,
+    int Dirty)
+{
+    public int For(RenderSceneIndex index) =>
+        index switch
+        {
+            RenderSceneIndex.OutdoorStatic => OutdoorStatic,
+            RenderSceneIndex.IndoorCellStatic => IndoorCellStatic,
+            RenderSceneIndex.Dynamic => Dynamic,
+            RenderSceneIndex.OutdoorDynamic => OutdoorDynamic,
+            RenderSceneIndex.PortalStraddlingDynamic =>
+                PortalStraddlingDynamic,
+            RenderSceneIndex.Translucent => Translucent,
+            RenderSceneIndex.Selectable => Selectable,
+            RenderSceneIndex.LightCandidate => LightCandidate,
+            RenderSceneIndex.Dirty => Dirty,
+            _ => throw new ArgumentOutOfRangeException(
+                nameof(index),
+                index,
+                null),
+        };
+}
+
 internal readonly record struct RenderDeltaApplyResult(
     int Applied,
     int Registered,
@@ -357,6 +401,7 @@ internal sealed class RenderSceneDigestBuffer
 internal interface IRenderSceneQuerySource
 {
     RenderProjectionCounts GetCounts(RenderSceneGeneration generation);
+    RenderSceneIndexCounts GetIndexCounts(RenderSceneGeneration generation);
 
     bool TryGet(
         RenderSceneGeneration generation,
@@ -367,6 +412,22 @@ internal interface IRenderSceneQuerySource
         RenderSceneGeneration generation,
         RenderProjectionClass? projectionClass,
         Span<RenderProjectionRecord> destination);
+
+    int CopyIndexTo(
+        RenderSceneGeneration generation,
+        RenderSceneIndex index,
+        Span<RenderProjectionRecord> destination);
+
+    int GetCellCount(
+        RenderSceneGeneration generation,
+        uint fullCellId,
+        bool dynamic);
+
+    int CopyCellTo(
+        RenderSceneGeneration generation,
+        uint fullCellId,
+        bool dynamic,
+        Span<RenderProjectionRecord> destination);
 }
 
 internal readonly struct RenderSceneQuery
@@ -386,6 +447,9 @@ internal readonly struct RenderSceneQuery
     public RenderProjectionCounts Counts =>
         Source.GetCounts(Generation);
 
+    public RenderSceneIndexCounts IndexCounts =>
+        Source.GetIndexCounts(Generation);
+
     public bool TryGet(
         RenderProjectionId id,
         out RenderProjectionRecord record) =>
@@ -399,6 +463,35 @@ internal readonly struct RenderSceneQuery
         Span<RenderProjectionRecord> destination) =>
         Source.CopyTo(Generation, projectionClass, destination);
 
+    public int CopyIndexTo(
+        RenderSceneIndex index,
+        Span<RenderProjectionRecord> destination) =>
+        Source.CopyIndexTo(Generation, index, destination);
+
+    public int GetCellStaticCount(uint fullCellId) =>
+        Source.GetCellCount(Generation, fullCellId, dynamic: false);
+
+    public int CopyCellStaticsTo(
+        uint fullCellId,
+        Span<RenderProjectionRecord> destination) =>
+        Source.CopyCellTo(
+            Generation,
+            fullCellId,
+            dynamic: false,
+            destination);
+
+    public int GetCellDynamicCount(uint fullCellId) =>
+        Source.GetCellCount(Generation, fullCellId, dynamic: true);
+
+    public int CopyCellDynamicsTo(
+        uint fullCellId,
+        Span<RenderProjectionRecord> destination) =>
+        Source.CopyCellTo(
+            Generation,
+            fullCellId,
+            dynamic: true,
+            destination);
+
     private IRenderSceneQuerySource Source =>
         _source
         ?? throw new InvalidOperationException("The render-scene query is uninitialized.");
@@ -420,5 +513,7 @@ internal interface IRenderScene : IDisposable
 
     RenderSceneQuery OpenQuery();
 
+    void ClearDirty();
+
     void Clear(RenderSceneGeneration replacementGeneration);
 }

src/AcDream.App/Rendering/Scene/StaticRenderProjectionJournal.cs

@@ -28,6 +28,12 @@ internal sealed class StaticRenderProjectionJournal :
     private readonly RenderProjectionJournal _journal;
     private readonly Dictionary<uint, Dictionary<RenderProjectionId, TrackedProjection>>
         _byLandblock = [];
+    private readonly Dictionary<RenderProjectionId, TrackedProjection>
+        _trackedById = [];
+    private readonly Dictionary<WorldEntity, RenderProjectionId> _idByEntity =
+        new(ReferenceEqualityComparer.Instance);
+    private readonly Dictionary<uint, List<WorldEntity>> _entitiesByLandblock =
+        [];
     private readonly List<RenderProjectionRecord> _candidates = [];
     private readonly List<RenderProjectionId> _removed = [];
     private ulong _nextIncarnation = 1;
@@ -87,7 +93,10 @@ internal sealed class StaticRenderProjectionJournal :
         for (int i = 0; i < _candidates.Count; i++)
         {
             RenderProjectionRecord candidate = _candidates[i];
-            if (current.TryGetValue(candidate.Id, out TrackedProjection retained))
+            if (current.TryGetValue(
+                    candidate.Id,
+                    out TrackedProjection? retained)
+                && retained is not null)
             {
                 _removed.Remove(candidate.Id);
                 RenderProjectionRecord accepted = candidate with
@@ -107,14 +116,14 @@ internal sealed class StaticRenderProjectionJournal :
                         OwnerIncarnation = NextIncarnation(),
                     };
                     _journal.Register(in accepted);
-                    current[candidate.Id] = new TrackedProjection(accepted);
+                    retained.Record = accepted;
                     continue;
                 }
 
                 if (accepted != retained.Record)
                 {
                     _journal.AppendDifference(retained.Record, accepted);
-                    current[candidate.Id] = new TrackedProjection(accepted);
+                    retained.Record = accepted;
                 }
                 continue;
             }
@@ -124,7 +133,9 @@ internal sealed class StaticRenderProjectionJournal :
                 OwnerIncarnation = NextIncarnation(),
             };
             _journal.Register(in registered);
-            current.Add(registered.Id, new TrackedProjection(registered));
+            var tracked = new TrackedProjection(registered);
+            current.Add(registered.Id, tracked);
+            _trackedById.Add(registered.Id, tracked);
             ProjectionCount++;
         }
 
@@ -135,11 +146,13 @@ internal sealed class StaticRenderProjectionJournal :
             TrackedProjection omitted = current[id];
             _journal.Unregister(id, omitted.Record.OwnerIncarnation);
             current.Remove(id);
+            _trackedById.Remove(id);
             ProjectionCount--;
         }
 
         if (current.Count == 0)
             _byLandblock.Remove(landblockId);
+        ReplaceStaticEntityMap(landblockId, publication.Landblock.Entities);
     }
 
     public void Retire(GpuLandblockRetirement retirement)
@@ -166,17 +179,66 @@ internal sealed class StaticRenderProjectionJournal :
         }
 
         ProjectionCount -= current.Count;
+        foreach (RenderProjectionId id in current.Keys)
+            _trackedById.Remove(id);
+        RemoveStaticEntityMap(landblockId);
     }
 
     public void Clear(RenderSceneGeneration replacementGeneration)
     {
         _byLandblock.Clear();
+        _trackedById.Clear();
+        _idByEntity.Clear();
+        _entitiesByLandblock.Clear();
         _candidates.Clear();
         _removed.Clear();
         ProjectionCount = 0;
         _journal.Clear(replacementGeneration);
     }
 
+    public void SynchronizeActiveAnimatedSources(
+        IReadOnlyList<WorldEntity> activeEntities)
+    {
+        ArgumentNullException.ThrowIfNull(activeEntities);
+        for (int i = 0; i < activeEntities.Count; i++)
+        {
+            WorldEntity entity = activeEntities[i];
+            if (!_idByEntity.TryGetValue(
+                    entity,
+                    out RenderProjectionId id)
+                || !_trackedById.TryGetValue(
+                    id,
+                    out TrackedProjection? tracked))
+            {
+                continue;
+            }
+
+            RenderProjectionRecord current =
+                RenderProjectionRecordFactory.ProjectEntity(
+                    id,
+                    RenderProjectionClass.ActiveAnimatedStatic,
+                    tracked.Record.OwnerIncarnation,
+                    tracked.Record.Residency.OwnerLandblockId,
+                    tracked.Record.Residency.FullCellId,
+                    entity,
+                    spatiallyVisible: true) with
+                {
+                    PreviousTransform = new PreviousRenderTransform(
+                        tracked.Record.Transform.LocalToWorld),
+                };
+            if (tracked.Record.ProjectionClass
+                != RenderProjectionClass.ActiveAnimatedStatic)
+            {
+                _journal.Register(in current);
+            }
+            else
+            {
+                _journal.AppendDifference(tracked.Record, current);
+            }
+            tracked.Record = current;
+        }
+    }
+
     internal bool TryGet(
         RenderProjectionId id,
         out RenderProjectionRecord record)
@@ -184,7 +246,10 @@ internal sealed class StaticRenderProjectionJournal :
         foreach (Dictionary<RenderProjectionId, TrackedProjection> projections
                  in _byLandblock.Values)
         {
-            if (projections.TryGetValue(id, out TrackedProjection tracked))
+            if (projections.TryGetValue(
+                    id,
+                    out TrackedProjection? tracked)
+                && tracked is not null)
             {
                 record = tracked.Record;
                 return true;
@@ -310,8 +375,43 @@ internal sealed class StaticRenderProjectionJournal :
     private static uint Canonicalize(uint landblockId) =>
         (landblockId & 0xFFFF0000u) | 0xFFFFu;
 
-    private readonly record struct TrackedProjection(
-        RenderProjectionRecord Record);
+    private void ReplaceStaticEntityMap(
+        uint landblockId,
+        IReadOnlyList<WorldEntity> entities)
+    {
+        RemoveStaticEntityMap(landblockId);
+        var retained = new List<WorldEntity>();
+        for (int i = 0; i < entities.Count; i++)
+        {
+            WorldEntity entity = entities[i];
+            if (entity.ServerGuid != 0)
+                continue;
+            RenderProjectionId id = StaticEntityId(landblockId, entity.Id);
+            if (!_trackedById.ContainsKey(id))
+                continue;
+            _idByEntity.Add(entity, id);
+            retained.Add(entity);
+        }
+        if (retained.Count > 0)
+            _entitiesByLandblock.Add(landblockId, retained);
+    }
+
+    private void RemoveStaticEntityMap(uint landblockId)
+    {
+        if (!_entitiesByLandblock.Remove(
+                landblockId,
+                out List<WorldEntity>? entities))
+        {
+            return;
+        }
+        for (int i = 0; i < entities.Count; i++)
+            _idByEntity.Remove(entities[i]);
+    }
+
+    private sealed class TrackedProjection(RenderProjectionRecord record)
+    {
+        public RenderProjectionRecord Record { get; set; } = record;
+    }
 
     private sealed class ProjectionRecordComparer :
         IComparer<RenderProjectionRecord>

src/AcDream.App/Update/LiveObjectFrameController.cs

@@ -138,6 +138,8 @@ internal sealed class LiveObjectFrameController : ILiveObjectFramePhase
     private readonly EquippedChildRenderController _equippedChildren;
     private readonly LiveEffectFrameController _effects;
     private readonly ILiveRenderProjectionSink? _renderProjections;
+    private readonly StaticRenderProjectionJournal? _staticRenderProjections;
+    private readonly List<WorldEntity> _activeStaticProjectionScratch = [];
 
     public LiveObjectFrameController(
         RetailInboundEventDispatcher inboundEvents,
@@ -152,7 +154,8 @@ internal sealed class LiveObjectFrameController : ILiveObjectFramePhase
         LiveEntityAnimationRuntimeView<LiveEntityAnimationState> animatedEntities,
         EquippedChildRenderController equippedChildren,
         LiveEffectFrameController effects,
-        ILiveRenderProjectionSink? renderProjections = null)
+        ILiveRenderProjectionSink? renderProjections = null,
+        StaticRenderProjectionJournal? staticRenderProjections = null)
     {
         _inboundEvents = inboundEvents ?? throw new ArgumentNullException(nameof(inboundEvents));
         _localPlayerFrame = localPlayerFrame
@@ -172,6 +175,7 @@ internal sealed class LiveObjectFrameController : ILiveObjectFramePhase
             ?? throw new ArgumentNullException(nameof(equippedChildren));
         _effects = effects ?? throw new ArgumentNullException(nameof(effects));
         _renderProjections = renderProjections;
+        _staticRenderProjections = staticRenderProjections;
     }
 
     public void Tick(float deltaSeconds) =>
@@ -207,6 +211,13 @@ internal sealed class LiveObjectFrameController : ILiveObjectFramePhase
             _animationPresenter.Present(schedules);
         _equippedChildren.Tick();
         _renderProjections?.SynchronizeActiveSources();
+        if (_staticRenderProjections is not null)
+        {
+            _staticAnimations.CopyActiveDatStaticEntitiesTo(
+                _activeStaticProjectionScratch);
+            _staticRenderProjections.SynchronizeActiveAnimatedSources(
+                _activeStaticProjectionScratch);
+        }
         // Retail CPhysicsObj::animate_static_object @ 0x00513DF0 runs
         // Script -> Particle -> process_hooks. acdream intentionally retains
         // the TS-51 static-order difference here: ProcessHooks precedes the

tests/AcDream.App.Tests/Rendering/ArchRenderSceneTests.cs

@@ -253,7 +253,8 @@ public sealed class ArchRenderSceneTests
         Assert.True(memory.EstimatedProjectionLookupBytes > 0);
         Assert.Equal(
             memory.EstimatedChunkPayloadBytes
-            + memory.EstimatedProjectionLookupBytes,
+            + memory.EstimatedProjectionLookupBytes
+            + memory.EstimatedIndexBytes,
             memory.TotalEstimatedBytes);
     }
 
@@ -359,6 +360,182 @@ public sealed class ArchRenderSceneTests
         Assert.Equal(0, scene.Counts.Total);
     }
 
+    [Fact]
+    public void IncrementalIndices_PreserveOutdoorCellDynamicAndFeatureMembership()
+    {
+        const uint indoorCell = 0x12340100u;
+        RenderSceneGeneration generation = Generation(16);
+        using var scene = new ArchRenderScene(generation);
+        RenderProjectionRecord outdoorStatic = Record(
+            1,
+            1,
+            RenderProjectionClass.OutdoorStatic);
+        RenderProjectionRecord indoorStatic = Record(
+            2,
+            1,
+            RenderProjectionClass.IndoorCellStatic) with
+        {
+            Residency = new RenderSpatialResidency(
+                Bucket(indoorCell),
+                0x1234FFFFu,
+                indoorCell),
+            Source = new RenderSourceMetadata() with
+            {
+                ParentCellId = indoorCell,
+            },
+        };
+        RenderProjectionRecord animatedStatic = Record(
+            3,
+            1,
+            RenderProjectionClass.ActiveAnimatedStatic);
+        RenderProjectionRecord outdoorDynamic = Record(
+            4,
+            1,
+            RenderProjectionClass.LiveDynamicRoot);
+        RenderProjectionRecord cellDynamic = Record(
+            5,
+            1,
+            RenderProjectionClass.LiveDynamicRoot) with
+        {
+            Residency = new RenderSpatialResidency(
+                Bucket(indoorCell),
+                0x1234FFFFu,
+                indoorCell),
+            Source = new RenderSourceMetadata() with
+            {
+                ParentCellId = indoorCell,
+            },
+        };
+        RenderProjectionRecord equipped = Record(
+            6,
+            1,
+            RenderProjectionClass.EquippedChild) with
+        {
+            Flags = RenderProjectionFlags.Draw
+                | RenderProjectionFlags.Selectable
+                | RenderProjectionFlags.Translucent
+                | RenderProjectionFlags.LightCandidate
+                | RenderProjectionFlags.PortalStraddling,
+        };
+        RenderProjectionRecord[] records =
+        [
+            outdoorStatic,
+            indoorStatic,
+            animatedStatic,
+            outdoorDynamic,
+            cellDynamic,
+            equipped,
+        ];
+        var deltas = new RenderProjectionDelta[records.Length];
+        for (int i = 0; i < records.Length; i++)
+        {
+            deltas[i] = RenderProjectionDelta.Register(
+                generation,
+                (ulong)i + 1,
+                records[i]);
+        }
+
+        scene.Apply(deltas);
+        RenderSceneQuery query = scene.OpenQuery();
+
+        Assert.Equal(
+            new RenderSceneIndexCounts(
+                OutdoorStatic: 2,
+                IndoorCellStatic: 1,
+                Dynamic: 3,
+                OutdoorDynamic: 2,
+                PortalStraddlingDynamic: 1,
+                Translucent: 1,
+                Selectable: 6,
+                LightCandidate: 1,
+                Dirty: 6),
+            query.IndexCounts);
+        Assert.Equal(1, query.GetCellStaticCount(indoorCell));
+        Assert.Equal(1, query.GetCellDynamicCount(indoorCell));
+        var cellRecords = new RenderProjectionRecord[1];
+        Assert.Equal(1, query.CopyCellStaticsTo(indoorCell, cellRecords));
+        Assert.Equal(indoorStatic.Id, cellRecords[0].Id);
+        Assert.Equal(1, query.CopyCellDynamicsTo(indoorCell, cellRecords));
+        Assert.Equal(cellDynamic.Id, cellRecords[0].Id);
+        Assert.True(scene.Memory.EstimatedIndexBytes > 0);
+    }
+
+    [Fact]
+    public void IncrementalIndices_UpdateRebucketReplaceRemoveAndDirtyAcknowledge()
+    {
+        const uint indoorCell = 0x22220100u;
+        RenderSceneGeneration generation = Generation(17);
+        using var scene = new ArchRenderScene(generation);
+        RenderProjectionRecord original = Record(
+            17,
+            1,
+            RenderProjectionClass.LiveDynamicRoot);
+        scene.Apply(
+            [RenderProjectionDelta.Register(generation, 1, original)]);
+        scene.ClearDirty();
+        Assert.Equal(0, scene.OpenQuery().IndexCounts.Dirty);
+
+        RenderProjectionRecord flagged = original with
+        {
+            Flags = original.Flags
+                | RenderProjectionFlags.Translucent
+                | RenderProjectionFlags.LightCandidate
+                | RenderProjectionFlags.PortalStraddling,
+            Source = original.Source with { ParentCellId = indoorCell },
+        };
+        RenderProjectionRecord rebucketed = flagged with
+        {
+            Residency = new RenderSpatialResidency(
+                Bucket(indoorCell),
+                0x2222FFFFu,
+                indoorCell),
+        };
+        scene.Apply(
+        [
+            RenderProjectionDelta.Update(
+                RenderProjectionDeltaKind.UpdateFlags,
+                generation,
+                2,
+                flagged),
+            RenderProjectionDelta.Update(
+                RenderProjectionDeltaKind.Rebucket,
+                generation,
+                3,
+                rebucketed),
+        ]);
+
+        RenderSceneQuery updated = scene.OpenQuery();
+        Assert.Equal(0, updated.IndexCounts.OutdoorDynamic);
+        Assert.Equal(1, updated.IndexCounts.PortalStraddlingDynamic);
+        Assert.Equal(1, updated.IndexCounts.Translucent);
+        Assert.Equal(1, updated.IndexCounts.LightCandidate);
+        Assert.Equal(1, updated.IndexCounts.Dirty);
+        Assert.Equal(1, updated.GetCellDynamicCount(indoorCell));
+
+        RenderProjectionRecord replacement = rebucketed with
+        {
+            ProjectionClass = RenderProjectionClass.IndoorCellStatic,
+            OwnerIncarnation = Incarnation(2),
+        };
+        scene.Apply(
+            [RenderProjectionDelta.Register(generation, 4, replacement)]);
+        RenderSceneQuery replaced = scene.OpenQuery();
+        Assert.Equal(0, replaced.IndexCounts.Dynamic);
+        Assert.Equal(1, replaced.IndexCounts.IndoorCellStatic);
+        Assert.Equal(1, replaced.GetCellStaticCount(indoorCell));
+
+        scene.Apply(
+        [
+            RenderProjectionDelta.Unregister(
+                generation,
+                5,
+                replacement.Id,
+                replacement.OwnerIncarnation),
+        ]);
+        Assert.Equal(default, scene.OpenQuery().IndexCounts);
+        Assert.True(scene.Memory.EstimatedIndexBytes > 0);
+    }
+
     private static RenderProjectionRecord Record(
         ulong id,
         ulong incarnation,

tests/AcDream.App.Tests/Rendering/StaticRenderProjectionJournalTests.cs

@@ -207,6 +207,62 @@ public sealed class StaticRenderProjectionJournalTests
             () => statics.Clear(Generation(7)));
     }
 
+    [Fact]
+    public void ActiveAnimatedSynchronization_ReclassifiesAndUpdatesOnlyActiveSource()
+    {
+        RenderSceneGeneration generation = Generation(8);
+        var journal = new RenderProjectionJournal(generation);
+        var statics = new StaticRenderProjectionJournal(journal);
+        WorldEntity animated = Entity(1);
+        WorldEntity ordinary = Entity(2);
+        LandblockBuild build = Build(
+            LandblockId,
+            [animated, ordinary],
+            includeShell: false);
+        statics.Reconcile(build, Publication(build));
+        using var scene = new ArchRenderScene(generation);
+        journal.DrainTo(scene);
+        RenderProjectionId animatedId =
+            StaticRenderProjectionJournal.StaticEntityId(
+                LandblockId,
+                animated.Id);
+        Assert.True(scene.OpenQuery().TryGet(animatedId, out var before));
+
+        statics.SynchronizeActiveAnimatedSources([animated]);
+        Assert.Single(journal.Pending.ToArray());
+        Assert.Equal(
+            RenderProjectionDeltaKind.Register,
+            journal.Pending[0].Kind);
+        Assert.Equal(
+            RenderProjectionClass.ActiveAnimatedStatic,
+            journal.Pending[0].Record.ProjectionClass);
+        Assert.Equal(
+            before.OwnerIncarnation,
+            journal.Pending[0].Record.OwnerIncarnation);
+        journal.DrainTo(scene);
+
+        statics.SynchronizeActiveAnimatedSources([animated]);
+        Assert.Equal(0, journal.Count);
+
+        animated.Rotation =
+            Quaternion.CreateFromAxisAngle(Vector3.UnitZ, 0.75f);
+        statics.SynchronizeActiveAnimatedSources([animated]);
+        Assert.Single(journal.Pending.ToArray());
+        Assert.Equal(
+            RenderProjectionDeltaKind.UpdateTransform,
+            journal.Pending[0].Kind);
+        Assert.True(statics.TryGet(animatedId, out var updated));
+        Assert.Equal(animated.Rotation, updated.Transform.Rotation);
+        RenderProjectionId ordinaryId =
+            StaticRenderProjectionJournal.StaticEntityId(
+                LandblockId,
+                ordinary.Id);
+        Assert.True(statics.TryGet(ordinaryId, out var unchanged));
+        Assert.Equal(
+            RenderProjectionClass.OutdoorStatic,
+            unchanged.ProjectionClass);
+    }
+
     private static GpuLandblockSpatialPublication Publication(
         LandblockBuild build,
         bool requiresActivation = true) =>