perf(streaming): outer tile classifier off by default; delete mode 2

Owner-approved, on the A/B measured in 83a0e4d: the classifier plus exact validation cost more than it saved on the game path. With it off, ready p95 is 182 vs 190-195 ms, generation p95 is 125-127 vs 139-141 ms, and density calls drop 18%. - GVoxelForgeOuterClassifierMode defaults to 0. Mode 1 stays reachable via voxel.OuterClassifierMode=1 as an A/B instrument; the clamp is now 0..1. - Mode 2 (validation samples reused as the mesher core grid) is deleted: the reuse grid, FVoxelMesherCoreDensityGrid, GenerateMesh's ReusableCoreGrid parameter, bValidationCoreReused, TotalValidationCoreReuseTiles and its log field. It could not fire: it reused the grid only when validation disproved a uniform verdict, which never happened, and Mixed tiles never validate. The mode-1 validation loop exits early again on the first disagreeing sample. - All three GenerateMesh call sites checked; the density-count pointer binds after BandVoxHi. Verified by Codex, checked by me against the logs: - build ok; the measured process loaded the staged DLL, SHA-256 1024D8CF..04D - export OBJ SHA-256 unchanged: b3e5f4c3..9b377 - a run WITHOUT the override prints outer_classifier_mode=0 validation_density_calls=0, proving the new default took effect - 841/841 tiles have identical triangle counts between mode 0 and mode 1. The 394 tiles mode 1 skipped as uniform produce 0 triangles in mode 0, so the strate band cut (applied by the mesher, not by validation) was not hiding geometry. Docs: ARCHITECTURE 8.10, CODEMAP (GenerateTileResult, ClassifyTile) and fable-idea T1.d record that streaming no longer classifies by default. WORK-NEXT item 1 records the owner's playtest: he can no longer fall through the world. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VZS94UH8bSsBeg5sZaxe2Y
2026-09-13 02:06:24 +02:00
1 parent 83a0e4d85c
commit c65b015f01
@@ -794,6 +794,13 @@ driven by `EditorBrush*` props.
  shadow-casting tile emits a second shadow-pass draw; the far coarse tiles don't need it. NOTE: fps is
  RENDER-side (draws ≈ visible tile count × passes); generation cost (workers) and tile *resolution*
  (cuts triangles, not draws/components) don't move the game thread — tile COUNT does (hence the clipmap).
+- ⛔ **2026-09-13: streaming no longer calls `ClassifyTile` by default** (`voxel.OuterClassifierMode`
+  = 0; `=1` restores it as an A/B instrument). Measured on the headless game path with nested
+  refinement off, the classifier plus its exact validation cost more than they saved. Mode 0 had
+  ready p95 182 vs 190-195 ms, generation p95 125-127 vs 139-141 ms, and 18% fewer density calls,
+  with 841/841 tiles triangle-identical (WORK-NEXT.md). Proving a 33³ core uniform costs almost
+  as much as meshing 35³. The history below explains why it existed. Its soundness tests still
+  guard it.
 - **Trivial-empty tile reject (T1.d) — v2 SHIPPED (2026-07-05); v1 was reverted 2026-06-26.**
  `UVoxelGenerator::ClassifyTile(Origin, Step, Cells)` runs on the gen worker BEFORE the density
  pre-sample (`LoadTile` task, scope `VoxelForge_ClassifyTile`); `AllSolid`/`AllAir` ⇒ GenerateMesh is
@@ -301,7 +301,7 @@ casse cette arithmetique *structurellement* — `BeginPlay` loggue une **Error**
 | `GetPlayerPosition` | 231 | Pawn position or zero. (`GetLODForChunk`/`LODToStep`/`IsChunkInRange` removed — dead since the clipmap.) |
 | `ProcessPendingChunks` | 301 | Drains ProcessQueue under per-frame budget; reads the per-request cancellation token before removing its map entry, drops obsolete/aborted results, then applies each live result via `ApplyTileResult`. |
 | `ApplyTileResult` | — | **Shared game-thread apply** for one `FChunkResult` (async drain + sync carve): discards stale generation epochs and keys no longer desired, marks loaded, ingests capture, EMPTY releases the tile's existing component (a re-gen can flip content→empty on band change — old geometry must not linger), else `ApplyMeshToTile`. Returns true iff a visible mesh uploaded (counts the budget). Doesn't touch `PendingTiles` (caller's). |
-| `GenerateTileResult` | — | **Shared worker-side gen** for one tile (async `LoadTile` task + sync `SyncRemeshTile`): ClassifyTile (T1.d) → `GenerateMesh`/`GenerateSheetMesh` → `BuildTileStreamSet`. Reads Generator/Mesher only → safe on a worker or the game thread; fills `FChunkResult`, no enqueue. |
+| `GenerateTileResult` | — | **Shared worker-side gen** for one tile (async `LoadTile` task + sync `SyncRemeshTile`): [ClassifyTile (T1.d) + exact validation, only when `voxel.OuterClassifierMode=1`; **default 0 since 2026-09-13**] → `GenerateMesh`/`GenerateSheetMesh` → `BuildTileStreamSet`. Reads Generator/Mesher only → safe on a worker or the game thread; fills `FChunkResult`, no enqueue. |
 | `SyncRemeshTile` | — | **INSTANT DIG**: level-0 same-frame re-mesh on the game thread (`GenerateTileResult` + `ApplyTileResult` inline, Cells=CHUNK_SIZE/Step=1 + strate band, no capture). Used for the tile under the brush centre so a carve is visible THIS frame; one full-res gen on the game thread. |
 | `UpdateChunksAroundPosition` | 362 | Builds desired set, cancels pending keys that left it, sorts from the **true pawn position**, submits the occupied/support LOD0 tile and the next tile along the pawn heading as an absolute `BackgroundHigh` prefix, then loads/unloads and handles LOD changes. **Delta cull**: `BuildDesiredTiles` returns the LEAVERS (stamped `DesiredStamped` map, one sweep) — only those + `TransitionHold` are considered per crossing, not every loaded tile. `BuildDesiredTiles` also applies `RenderDistanceChunks`: the outermost shell widens to cover the distance — as level-MaxClipLevel MC tiles, or (F18 `bFarSheetRing`) as a SHEET ring at level MaxClipLevel+span (covered-check vs the MaxClipLevel box; `VF_OuterShell` shared with `IsTileInClipRange` so the cull sees the same horizon), dz pre-clamped to the vertical band. **§9.3 anchors:** also prunes dead `StreamingAnchors` + detects their chunk crossings → rebuilds the desired set when an anchor moves/(un)registers (`bAnchorsMoved`/`bForceDesiredRebuild`), same cadence as player movement. §8.10. |
 | `BuildDesiredTiles` | ~722 | Builds `DesiredSorted`+`DesiredStamped` (player clipmap shells + F18 sheet ring) then `AddAnchorDesiredTiles()` before the leaver sweep; it orders from the true local pawn position and builds `CriticalDesiredTiles` for the occupied/support and heading tiles. |
@@ -344,7 +344,7 @@ This is **where terrain shape lives.**
 | `SampleSurfaceStructuralZ` | — | **F20:** the RAW SurfaceWorld heightfield (continents+mountains+detail), BEFORE any terrain op; returns terrain Z + relief M. Cliff re-samples it at an XY offset for a cheap analytic slope. |
 | `ComputeSurfaceTerrainZ` / `GetSurfaceDensity` | — | SurfaceWorld heightfield → terrain Z, then density; biome **output-blend** lerps dominant/neighbour heights (`ParamsD`/`ParamsN`/weight). **F20 surface ops** (`FSurfaceGenerationParams`, biome-selected + slope/relief-conditioned, all default off): Cliff (slope-gated STEEPENING — push height from local mean where steep ⇒ sheer walls; 4 structural resamples only when on), Terrace (relief-gated + `TerraceHardness`), LayerLines (sedimentary shelves) — pure per-column height REMAPS applied here so the single height oracle stays consistent (MC/sheets/ClassifyTile/deco/BP bridge). **Phase 2 OVERHANG** (volumetric — real jutting shelves): in `SurfaceDensityFromColumn`, for AIR voxels in a window `(TerrainZ, TerrainZ+OverhangHeight]` above a steep slope, the heightfield is re-sampled UPHILL (toward the cliff) by a reach that GROWS with height (tiny low ⇒ air over the void, full high ⇒ borrows the far cliff rock) and unioned in ⇒ a shelf attached to the cliff, tapering out over the void with air beneath (the sketch). Per-column `OverhangAmp`(=strength·slope-gate) + unit uphill `(DirX,DirY)` resolved once in `ComputeSurfaceColumn` (gradient sampled at the REACH scale so a spot over the void can see the cliff), cached on `FSurfaceColumn`. Genuine 3D (per-voxel structural re-eval, gated to steep overhang columns). Off ⇒ byte-identical. §8.14. |
 | `VF_BuildOpStackForChunk` (file-static) | — | **The archetype → stack mapping, written down once.** `GetDensityAt` and `ClassifyTile` both call it; params are passed in, never fetched here. A second copy would be the worst bug available in this file — a tile skipped on the verdict of a stack that is not the one producing its density is a hole. Returns false (⇒ caller falls back to the `switch`) for an unported archetype, missing params, or a **degenerate strate**, since five archetype functions early-out to air there and the stack deliberately has no such early-out. `Refs.Surface == nullptr` makes it refuse SurfaceWorld, which is how `ClassifyTile` keeps its own exact-lattice proof. |
-| `ClassifyTile` | — | **T1.d trivial-tile reject.** Cooked/editor recipes now build the exact recipe stack and call its proved `ClassifyBox`; a tile crossing a slot/gap, any diff, or any disturbance returns `Mixed`. This replaces the old global `HasComposerRecipeOverride()` force-to-Mixed. Native cave/surface/gap proofs and all §8.10 caches remain unchanged. |
+| `ClassifyTile` | — | **T1.d trivial-tile reject. ⛔ Not called by streaming by default since 2026-09-13** (`voxel.OuterClassifierMode=0`; net-negative in game, see ARCHITECTURE §8.10). Cooked/editor recipes now build the exact recipe stack and call its proved `ClassifyBox`; a tile crossing a slot/gap, any diff, or any disturbance returns `Mixed`. This replaces the old global `HasComposerRecipeOverride()` force-to-Mixed. Native cave/surface/gap proofs and all §8.10 caches remain unchanged. |
 | `SampleRelief` / `SampleMoisture` | — | Climate fields (pure XY, [0,1]). Relief = shared source of truth for the relief map M. §8.14. |
 | `SampleBiomeAt` | — | Warped-Voronoi + climate biome query (dominant + neighbour + weight). Reference used by the preview bake + `GetDominantBiomeAt`. §8.14. |
 | `ResolveBiomeSampleAt` / `RebuildBiomeGrid` | — | Hot-path biome resolve (FBiomeSample) via a box-validated per-chunk cell-grid cache. Bit-identical to `SampleBiomeAt`. §8.14, §8.10. |
@@ -38,7 +38,6 @@ namespace
 FVoxelMeshData UVoxelMarchingCubesMesher::GenerateMesh(FIntVector OriginVoxels, int32 Step, int32 InCellsPerAxis,
                                                       TArray<uint8>* OutCaptureGrid,
                                                       int32 BandZMinVox, int32 BandZMaxVox,
-                                                       const FVoxelMesherCoreDensityGrid* ReusableCoreGrid,
                                                       int64* OutDensitySampleCount)
 {
    TRACE_CPUPROFILER_EVENT_SCOPE(VoxelForge_MesherGenerateMesh);
@@ -230,13 +229,6 @@ FVoxelMeshData UVoxelMarchingCubesMesher::GenerateMesh(FIntVector OriginVoxels,
    const int32 CellsPerAxis = FMath::Clamp(InCellsPerAxis, 2, CHUNK_SIZE);  // coarse tiles use fewer
    const int32 GridDim      = CellsPerAxis + 1;
    const int32 MDim         = GridDim + 2;            // +1 marge de chaque côté
-    const bool bUseReusableCoreGrid = !OutCaptureGrid
-        && ReusableCoreGrid
-        && ReusableCoreGrid->OriginVoxels == OriginVoxels
-        && ReusableCoreGrid->Step == Step
-        && ReusableCoreGrid->CellsPerAxis == CellsPerAxis
-        && ReusableCoreGrid->Samples.Num() == GridDim * GridDim * GridDim;
-
    // COUPE DE CONTENU PAR STRATE — restreint le maillage (et l'échantillonnage) aux cellules
    // dont l'intervalle Z chevauche la bande [BandZMinVox, BandZMaxVox] (voxels inclusifs).
    // Les tuiles à capture ne sont jamais bandées (niveau 0 — garde-fou ci-dessous).
@@ -541,7 +533,7 @@ FVoxelMeshData UVoxelMarchingCubesMesher::GenerateMesh(FIntVector OriginVoxels,
    // gradient) sont échantillonnées — le reste du tampon reste non initialisé et non lu.
    VoxelDensityProfile::FScopedTimer MesherDensityGridTimer(
        VoxelDensityProfile::EBucket::MesherDensityGrid);
-    const bool bUseOperatorBlock = !bUseSharedDensityGrid && !bUseReusableCoreGrid
+    const bool bUseOperatorBlock = !bUseSharedDensityGrid
        && GVoxelForgeUseOperatorBlock != 0;
    if (bUseOperatorBlock)
    {
@@ -576,14 +568,6 @@ FVoxelMeshData UVoxelMarchingCubesMesher::GenerateMesh(FIntVector OriginVoxels,
                    DensityGrid[LocalIndex] = ReuseGrid->Samples[
                        (SharedZ * ReuseGrid->Dim + SharedY) * ReuseGrid->Dim + SharedX];
                }
-                else if (bUseReusableCoreGrid
-                    && gx >= 0 && gx < GridDim
-                    && gy >= 0 && gy < GridDim
-                    && gz >= 0 && gz < GridDim)
-                {
-                    DensityGrid[LocalIndex] = ReusableCoreGrid->Samples[
-                        (gz * GridDim + gy) * GridDim + gx];
-                }
                else
                {
                    // World voxel = tile origin + grid offset scaled by the cell size (Step).
@@ -82,13 +82,12 @@ namespace
        GVoxelForgeUseBlockEarlyOut,
        TEXT("Use the optional nested 8x8x8 mesher classifier in streaming."));

-    // Outer classifier benchmark modes: 0 = disabled, 1 = current discarded exact validation,
-    // 2 = exact validation core reused by the mesher when the candidate fails validation.
-    int32 GVoxelForgeOuterClassifierMode = 1;
+    // Outer classifier benchmark modes: 0 = disabled, 1 = current discarded exact validation.
+    int32 GVoxelForgeOuterClassifierMode = 0;
    FAutoConsoleVariableRef CVarVoxelForgeOuterClassifierMode(
        TEXT("voxel.OuterClassifierMode"),
        GVoxelForgeOuterClassifierMode,
-        TEXT("Outer tile classifier mode: 0 off, 1 discarded validation, 2 validation-core reuse."));
+        TEXT("Outer tile classifier mode: 0 off, 1 discarded exact validation."));

    // Startup command-line cvars can arrive before the game world has spawned AVoxelWorld (or
    // before its first tiles have become visible). Keep the diagnostic edit pending until Tick has
@@ -1058,7 +1057,6 @@ void AVoxelWorld::BeginPlay()
    TotalObsoleteWorkerTasks.store(0, std::memory_order_relaxed);
    TotalValidationDensityCalls.store(0, std::memory_order_relaxed);
    TotalMesherDensityCalls.store(0, std::memory_order_relaxed);
-    TotalValidationCoreReuseTiles.store(0, std::memory_order_relaxed);
    for (int32 LOD = 0; LOD < TrackedClassifierLODCount; ++LOD)
    {
        OuterClassifierCallsByLOD[LOD].store(0, std::memory_order_relaxed);
@@ -1098,7 +1096,7 @@ void AVoxelWorld::BeginPlay()
        GVoxelForgeOuterClassifierMode = CommandLineOuterClassifierMode;
    }
    GVoxelForgeUseBlockEarlyOut = GVoxelForgeUseBlockEarlyOut != 0 ? 1 : 0;
-    GVoxelForgeOuterClassifierMode = FMath::Clamp(GVoxelForgeOuterClassifierMode, 0, 2);
+    GVoxelForgeOuterClassifierMode = FMath::Clamp(GVoxelForgeOuterClassifierMode, 0, 1);

    if (GVoxelForgePerfAttribution != 0)
    {
@@ -2181,7 +2179,6 @@ void AVoxelWorld::LogStreamingLatencySummary() const
             "outer_classifier_mode=%d nested_block_early_out=%d "
             "worker_generation_tasks=%llu worker_generation_sum_s=%.6f "
             "validation_density_calls=%llu mesher_density_calls=%llu "
-             "validation_core_reuse_tiles=%llu "
             "obsolete_worker_tasks=%llu obsolete_worker_sum_s=%.6f "
             "outer_classifier_verdicts=%s"),
        bDiagnosticsEnabled ? TEXT("profiled") : TEXT("clean"),
@@ -2197,7 +2194,6 @@ void AVoxelWorld::LogStreamingLatencySummary() const
        FPlatformTime::ToSeconds64(WorkerGenerationCycles),
        static_cast<unsigned long long>(TotalValidationDensityCalls.load(std::memory_order_relaxed)),
        static_cast<unsigned long long>(TotalMesherDensityCalls.load(std::memory_order_relaxed)),
-        static_cast<unsigned long long>(TotalValidationCoreReuseTiles.load(std::memory_order_relaxed)),
        static_cast<unsigned long long>(TotalObsoleteWorkerTasks.load(std::memory_order_relaxed)),
        FPlatformTime::ToSeconds64(ObsoleteWorkerCycles),
        *ClassifierVerdictSummary);
@@ -3885,7 +3881,6 @@ void AVoxelWorld::GenerateTileResult(const FVoxelTileKey& Tile, const FIntVector
    Result.NumTriangles = 0;
    Result.ValidationDensityCalls = 0;
    Result.MesherDensityCalls = 0;
-    Result.bValidationCoreReused = false;
    Result.Streams.Reset();
    Result.CaptureGrid.Reset();
    Result.BandChunkLo = BandChunkLo;   // strate content cut (MIN/MAX = uncut)
@@ -3917,10 +3912,7 @@ void AVoxelWorld::GenerateTileResult(const FVoxelTileKey& Tile, const FIntVector
    // même pour les cellules uniformes, et ces tuiles sont rares (fenêtre d'ombre).
    // (Gate IsoLevel == 0 : les verdicts du classifieur supposent l'iso MC à zéro exactement.)
    bool bTrivialEmpty = false;
-    FVoxelMesherCoreDensityGrid ValidationCoreGrid;
-    const FVoxelMesherCoreDensityGrid* ReusableCoreGrid = nullptr;
-    const int32 OuterClassifierMode = FMath::Clamp(GVoxelForgeOuterClassifierMode, 0, 2);
-    const bool bUseValidationCoreReuse = OuterClassifierMode == 2;
+    const int32 OuterClassifierMode = FMath::Clamp(GVoxelForgeOuterClassifierMode, 0, 1);
    if (OuterClassifierMode != 0
        && !bSheetTile && !bWantCapture && Generator && Mesher && Mesher->IsoLevel == 0.0f)
    {
@@ -3950,19 +3942,9 @@ void AVoxelWorld::GenerateTileResult(const FVoxelTileKey& Tile, const FIntVector
            TGuardValue<int32> ValidationSampleStepGuard(
                VoxelGenLOD::SampleStep, ValidationStep);

-            if (bUseValidationCoreReuse)
-            {
-                ValidationCoreGrid.OriginVoxels = OriginVoxels;
-                ValidationCoreGrid.Step = ValidationStep;
-                ValidationCoreGrid.CellsPerAxis = ValidationCells;
-                const int32 ValidationDim = ValidationCells + 1;
-                ValidationCoreGrid.Samples.SetNumUninitialized(
-                    ValidationDim * ValidationDim * ValidationDim);
-            }
-
            bool bExactUniform = true;
            for (int32 Z = 0; Z <= ValidationCells
-                && (bUseValidationCoreReuse || bExactUniform) && !bValidationAborted; ++Z)
+                && bExactUniform && !bValidationAborted; ++Z)
            {
                if (ShouldAbortWork(ObsoleteFlag))
                {
@@ -3970,7 +3952,7 @@ void AVoxelWorld::GenerateTileResult(const FVoxelTileKey& Tile, const FIntVector
                    break;
                }
                for (int32 Y = 0; Y <= ValidationCells
-                    && (bUseValidationCoreReuse || bExactUniform) && !bValidationAborted; ++Y)
+                    && bExactUniform && !bValidationAborted; ++Y)
                {
                    for (int32 X = 0; X <= ValidationCells; ++X)
                    {
@@ -3984,22 +3966,13 @@ void AVoxelWorld::GenerateTileResult(const FVoxelTileKey& Tile, const FIntVector
                            OriginVoxels.Y + Y * ValidationStep,
                            OriginVoxels.Z + Z * ValidationStep);
                        ++Result.ValidationDensityCalls;
-                        if (bUseValidationCoreReuse)
-                        {
-                            const int32 ValidationDim = ValidationCells + 1;
-                            ValidationCoreGrid.Samples[
-                                (Z * ValidationDim + Y) * ValidationDim + X] = Density;
-                        }
                        const bool bSampleAgrees = FMath::IsFinite(Density) && Density != 0.0f
                            && (Verdict != EVoxelTileClass::AllSolid || Density < 0.0f)
                            && (Verdict != EVoxelTileClass::AllAir || Density > 0.0f);
                        if (!bSampleAgrees)
                        {
                            bExactUniform = false;
-                            if (!bUseValidationCoreReuse)
-                            {
-                                break;
-                            }
+                            break;
                        }
                    }
                }
@@ -4011,12 +3984,6 @@ void AVoxelWorld::GenerateTileResult(const FVoxelTileKey& Tile, const FIntVector
                // A false Mixed costs meshing; a false uniform verdict removes both render and
                // collision geometry. Fall back to the safe path whenever one exact vertex disagrees.
                ValidatedVerdict = EVoxelTileClass::Mixed;
-                if (bUseValidationCoreReuse && !bValidationAborted)
-                {
-                    ReusableCoreGrid = &ValidationCoreGrid;
-                    Result.bValidationCoreReused = true;
-                    TotalValidationCoreReuseTiles.fetch_add(1, std::memory_order_relaxed);
-                }
            }
        }
        if (bValidationAborted)
@@ -4067,7 +4034,7 @@ void AVoxelWorld::GenerateTileResult(const FVoxelTileKey& Tile, const FIntVector
                                        HoleMinX, HoleMinY, HoleMaxX, HoleMaxY)
            : Mesher->GenerateMesh(OriginVoxels, Step, Cells,
                                   bWantCapture ? &Result.CaptureGrid : nullptr,
-                                   BandVoxLo, BandVoxHi, ReusableCoreGrid,
+                                   BandVoxLo, BandVoxHi,
                                   &Result.MesherDensityCalls);
        TotalMesherDensityCalls.fetch_add(
            static_cast<uint64>(Result.MesherDensityCalls), std::memory_order_relaxed);
@@ -38,8 +38,6 @@ struct FVoxelSharedDensityGrid
    }
 };

-struct FVoxelMesherCoreDensityGrid;
-
 UCLASS(BlueprintType)
 class VOXELFORGE_API UVoxelMarchingCubesMesher : public UObject
 {
@@ -72,7 +70,6 @@ public:
    FVoxelMeshData GenerateMesh(FIntVector OriginVoxels, int32 Step = 1, int32 CellsPerAxis = CHUNK_SIZE,
                                TArray<uint8>* OutCaptureGrid = nullptr,
                                int32 BandZMinVox = INT32_MIN, int32 BandZMaxVox = INT32_MAX,
-                                const FVoxelMesherCoreDensityGrid* ReusableCoreGrid = nullptr,
                                int64* OutDensitySampleCount = nullptr);

    /**
@@ -166,22 +163,3 @@ public:
    // Réduction d'octaves sur les tuiles grossières ; 0 = désactivé.
    int32 LODOctaveDrop = 0;
 };
-
-// A per-tile core lattice produced by the outer classifier's exact validation.  Unlike
-// FVoxelSharedDensityGrid this is intentionally local to one GenerateMesh call: validation can
-// run concurrently on several streaming workers without mutating shared mesher state.
-struct FVoxelMesherCoreDensityGrid
-{
-    FIntVector OriginVoxels = FIntVector::ZeroValue;
-    int32 Step = 1;
-    int32 CellsPerAxis = 0;
-    TArray<float> Samples;
-
-    void Reset()
-    {
-        OriginVoxels = FIntVector::ZeroValue;
-        Step = 1;
-        CellsPerAxis = 0;
-        Samples.Reset();
-    }
-};
@@ -111,7 +111,6 @@ struct FChunkResult
    // count exact validation and mesher density calls locally, then publish one aggregate update.
    int64 ValidationDensityCalls = 0;
    int64 MesherDensityCalls = 0;
-    bool bValidationCoreReused = false;
    bool bAborted = false;    // Worker observed shutdown or cancellation; never mark this tile loaded
    bool bObsolete = false;   // Worker observed per-tile desired-set cancellation
    uint32 DesiredEpoch = 0;  // Desired-set epoch captured at request time
@@ -929,7 +928,6 @@ public:
    std::atomic<uint64> TotalObsoleteWorkerTasks{0};
    std::atomic<uint64> TotalValidationDensityCalls{0};
    std::atomic<uint64> TotalMesherDensityCalls{0};
-    std::atomic<uint64> TotalValidationCoreReuseTiles{0};
    std::atomic<uint64> OuterClassifierCallsByLOD[TrackedClassifierLODCount]{};
    std::atomic<uint64> OuterClassifierVerdictsByLOD[TrackedClassifierLODCount][3]{};

@@ -28,6 +28,10 @@ The player falls through the world. There is **no invariant** that a tile you oc
 **Do**: record cook-complete; gate the pawn (spawn and movement) on the supporting tile being
 collidable, not merely applied.

+✅ **Owner playtest, 2026-09-13: he can no longer fall through the world.** The gate uses RMC's
+`SetCollisionConfig()` future as the authority (`HandleTileCollisionCookComplete`,
+`IsPlayerSupportCollisionReady`).
+
 📖 **Reading `Plugins/RealtimeMeshComponent` is permitted for this item — READ ONLY.** Find whether a
 cook-complete delegate/flag exists. ⛔ No edits, no builds against it: the owner's copy carries custom
 modifications and was destroyed once by an over-broad delete.
@@ -125,8 +129,14 @@ figure and does ~18% fewer density calls. It cannot remove geometry, since it sk
 *disproved* (`VoxelWorld.cpp` ~4012), and validation disproved none: 0 reuse tiles in every run. Mixed
 tiles, the ones that actually need a grid, never run validation, so there is nothing to reuse.

-**Recommendation, pending the owner:** set `GVoxelForgeOuterClassifierMode` default to 0. It stays
-switchable by `voxel.OuterClassifierMode`.
+**Done 2026-09-13, owner approved:** `GVoxelForgeOuterClassifierMode` now defaults to 0, and mode 2
+is deleted along with its reuse grid, its mesher parameter and its counter. Mode 1 is still
+reachable with `voxel.OuterClassifierMode=1` as an A/B instrument. Verified:
+- export OBJ SHA-256 unchanged (`b3e5f4c3..9b377`)
+- a run without the override prints `outer_classifier_mode=0 validation_density_calls=0`
+- **841/841 tiles have identical triangle counts between mode 0 and mode 1**. The 394 tiles mode 1
+  skipped as uniform produce 0 triangles in mode 0, so the strate band cut was not hiding geometry
+  behind the classifier.

 ⚠️ **Correction to `f204413`.** Its message says the nested classifier's 3.5x "cannot be reproduced".
 That was my measurement error: I passed `-voxel.UseBlockEarlyOut=1` (the STREAMING console variable)
@@ -45,6 +45,9 @@ So: normals can cost as much as the entire density grid; a SurfaceWorld chunk do
 **T1.c — Collision only where it matters.** `bShouldCreateCollision = (LOD == 0)`. Distant chunks are unreachable by definition (if the player got there, they'd be LOD0 — and the LOD reconciliation loop §8.10 guarantees a hot-swap on approach). Kills Chaos cooking + collision memory for the large majority of loaded chunks. Also check RMC's async-collision setting is on. **Likely the best win-per-line-changed in the whole document.**

 **T1.d — Chunk classification: skip trivially solid/air chunks before sampling.** ✅ DONE 2026-07-05
+⛔ **Turned OFF in streaming 2026-09-13.** After the operator stack, it cost more than it saved on the
+game path (WORK-NEXT.md A/B). Do not re-propose tile classification without a design that is
+cheaper than meshing the tile.
 (v2 — `UVoxelGenerator::ClassifyTile`, see ARCHITECTURE §8.10; a 2026-06-26 v1 with a global ceiling
 bound was reverted for roof holes. Trigger: trace showed 84 % of GenerateMesh calls produced empty
 tiles.) In a tall multi-strate world most chunks in the desired set are full bedrock or full sky. Conservative per-chunk test before the 33³ sample: for heightfield strates, min/max terrain over the footprint (free from T1.a's column grid ± noise amplitude bound) vs the chunk's Z range; for cave strates, "no room/tunnel/passage/spine/seal/diff-layer bounds intersect" (all bounding data already exists). Fully-solid/air ⇒ empty MeshData, no component, done. Cuts whole chunks, not percentages — compounds with everything else.