measure(perf): per-component ablation of the TunnelNetwork path; exact worms restored

Round (Codex; reviewed by me against PERF-SAMPLED.md).

Revert: voxel.WormNoiseMode / voxel.WormLatticeStep, their storage and their switches are
REMOVED. VoxelWormField has one path again, exact Perlin with the N1 short circuit. Kept:
bEnableWorms (asset), WormsForceOff (measurement only), the exact block skip (default 0).

Ablation instrument: 14 development-only, world-changing force-off bits (voxel.TunnelAblate*),
applied on the fused, op-stack/classifier, cached SDF/core and modifier/floor paths. They resolve
once per process, are hashed into the generation fingerprint, and are compiled to zero in
UE_BUILD_SHIPPING (VoxelDensityAblation.cpp). They are a measurement instrument, never a gameplay
or multiplayer switch.

Defaults exact: canonical export OBJ b3e5f4c3..9b377, worms-region 311CA42C / 75,482 triangles,
capability 20,830 / 10,909, and 841/841 keyed tiles identical to NextHeadStaticTrace_20260913.

Static worker seconds saved by removing ONE component (two off runs vs the interleaved all-on
33.06 s; baseline noise 0.27%):
  tunnel SDF 11.4%, cave warp 10.3%, passage carving 10.1%, landing posts 9.9%,
  passage structural posts 5.6%, worms 2.4%, native floor 2.2%, origin spine 1.6%,
  room SDF 1.6%, everything else <= 1.1%
Moving (2+2 runs each) confirms the top five at 6.0-11.6%. Tunnel SDF off cuts LOD0 generation
p95 104 -> 83 ms: it owns the slow tail. The positive savings sum to 58% of the static total; the
other 42% is shared. The rows are not additive.

Unexplained: tunnel-core OFF made the static total 2.9x SLOWER (95.5 s) while LOD0 generation got
faster (p50 64.7 -> 60.6 ms) and triangles fell. The report blames the changed field, which does
not fit; more likely a slow fallback path in coarse tiles. That row is not a cost measurement.

Ledger: every Unreal process exited 0 and verified the loaded DLL; two PowerShell parser errors
happened before any process started. No crashes or retries.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TaFdXhTdYMkW1xrV6ApT6Y

Source/VoxelForge/Private/VoxelCaveMorphology.cpp

@@ -30,6 +30,7 @@
 #include "VoxelCaveMorphology.h"
 #include "VoxelDensityProfile.h"
 #include "VoxelDensityPrimitives.h"
+#include "VoxelDensityAblation.h"
 #include "VoxelStrateMeasure.h"
 #include "VoxelTypes.h"          // Pour VOXEL_NOISE_SCALE, SmoothStep01
 #include "VoxelStrateTypes.h"
@@ -3166,6 +3167,10 @@ namespace
         const FStrateGenerationParams& Params,
         uint32 Seed)
     {
+        if (VoxelDensityAblation::IsCaveWarpOff())
+        {
+            return WorldPoint;
+        }
         float EffectiveZ = WorldPoint.Z;
         if (Params.VerticalScale > 0.0f && Params.VerticalScale != 1.0f)
         {
@@ -7286,7 +7291,9 @@ void VoxelCaveMorphology::BuildChunkCache(
         CR.RoomOp->ApplyTo(OpParams, CR.RoomOpWeight);
 
         // PITS — downward shafts anchored in the room's lower half.
-        BakeRoomFeature(CR, /*Max*/2, OpParams.PitDensity,
+        if (!VoxelDensityAblation::IsPitChimneySDFOff())
+        {
+            BakeRoomFeature(CR, /*Max*/2, OpParams.PitDensity,
             0xDE1A7Eu, 6271u, 0xABCDu, 0x5EEDu,
             /*XYScale*/0.6f, OpParams.PitMinRadius, OpParams.PitMaxRadius,
             [&](float PX, float PY, float PitRadius, uint32 PH3)
@@ -7308,8 +7315,8 @@ void VoxelCaveMorphology::BuildChunkCache(
                 OutCache.Pits.Add(Pit);
             });
 
-        // CHIMNEYS — mirror of pits: upward tubes anchored in the room's upper half.
-        BakeRoomFeature(CR, /*Max*/2, OpParams.ChimneyDensity,
+            // CHIMNEYS — mirror of pits: upward tubes anchored in the room's upper half.
+            BakeRoomFeature(CR, /*Max*/2, OpParams.ChimneyDensity,
             0xC4F007u, 7919u, 0x1337u, 0xCAFEu,
             /*XYScale*/0.6f, OpParams.ChimneyMinRadius, OpParams.ChimneyMaxRadius,
             [&](float CX, float CY, float ChmRadius, uint32 CH3)
@@ -7330,6 +7337,7 @@ void VoxelCaveMorphology::BuildChunkCache(
                 Chim.BoundXYRadiusSq = MaxXYR * MaxXYR;
                 OutCache.Chimneys.Add(Chim);
             });
+        }
 
         // COLUMNS — full-height solid cylinders (no Z anchor, no flare).
         BakeRoomFeature(CR, /*Max*/4, OpParams.ColumnDensity,
@@ -7481,9 +7489,13 @@ float VoxelCaveMorphology::EvaluateSDFCached(
         MinSDF = VoxelSDF::SmoothMin(MinSDF, RoomSDF, BlendK);
     };
 
-    const int32 RoomCandidateCount = VF_ForEachSpatialCandidate(
-        Cache.RoomSpatialIndex, Cache.Rooms.Num(), WorldX, WorldY, EvaluateRoom,
-        bUseSpatialIndex);
+    int32 RoomCandidateCount = 0;
+    if (!VoxelDensityAblation::IsRoomSDFOff())
+    {
+        RoomCandidateCount = VF_ForEachSpatialCandidate(
+            Cache.RoomSpatialIndex, Cache.Rooms.Num(), WorldX, WorldY, EvaluateRoom,
+            bUseSpatialIndex);
+    }
     if (VoxelDensityProfile::AreCountersEnabled())
     {
         VoxelDensityProfile::AddCounter(
@@ -7512,9 +7524,12 @@ float VoxelCaveMorphology::EvaluateSDFCached(
         const float JoinSDF = FMath::Max(HorizontalSDF, VerticalSDF);
         MinSDF = VoxelSDF::SmoothMin(MinSDF, JoinSDF, BlendK);
     };
-    VF_ForEachSpatialCandidate(
-        Cache.RoomFloorJoinSpatialIndex, Cache.RoomFloorJoins.Num(),
-        WorldX, WorldY, EvaluateJoin, bUseSpatialIndex);
+    if (!VoxelDensityAblation::IsRoomSDFOff())
+    {
+        VF_ForEachSpatialCandidate(
+            Cache.RoomFloorJoinSpatialIndex, Cache.RoomFloorJoins.Num(),
+            WorldX, WorldY, EvaluateJoin, bUseSpatialIndex);
+    }
 
     //=========================================================================
     // Tunnel SDFs
@@ -7553,9 +7568,13 @@ float VoxelCaveMorphology::EvaluateSDFCached(
         MinSDF = VoxelSDF::SmoothMin(MinSDF, TunnelSDF, BlendK);
     };
 
-    const int32 TunnelCandidateCount = VF_ForEachSpatialCandidate(
-        Cache.TunnelSpatialIndex, Cache.Tunnels.Num(), WorldX, WorldY, EvaluateTunnel,
-        bUseSpatialIndex);
+    int32 TunnelCandidateCount = 0;
+    if (!VoxelDensityAblation::IsTunnelSDFOff())
+    {
+        TunnelCandidateCount = VF_ForEachSpatialCandidate(
+            Cache.TunnelSpatialIndex, Cache.Tunnels.Num(), WorldX, WorldY, EvaluateTunnel,
+            bUseSpatialIndex);
+    }
     if (VoxelDensityProfile::AreCountersEnabled())
     {
         VoxelDensityProfile::AddCounter(
@@ -7577,6 +7596,10 @@ float VoxelCaveMorphology::EvaluateTunnelCoreSDF(
     const FChunkSDFCache& Cache,
     bool bUseSpatialIndex)
 {
+    if (VoxelDensityAblation::IsTunnelCoreOff())
+    {
+        return FLT_MAX;
+    }
     const FVector Pos(WorldX, WorldY, WorldZ);
     float MinSDF = FLT_MAX;
     const FCachedTunnel* TunnelData = Cache.Tunnels.GetData();
@@ -7618,6 +7641,10 @@ FTunnelCoreWorldEvaluation VoxelCaveMorphology::EvaluateTunnelCoreWorld(
     const FTunnelSupportFloorColumn* SupportColumn,
     bool bUseSpatialIndex)
 {
+    if (VoxelDensityAblation::IsTunnelCoreOff())
+    {
+        return FTunnelCoreWorldEvaluation();
+    }
     VoxelDensityProfile::FScopedTimer ProfileTimer(
         VoxelDensityProfile::EBucket::TunnelCoreWorld);
     const FVector Pos(WorldX, WorldY, WorldZ);
@@ -7756,6 +7783,10 @@ bool VoxelCaveMorphology::IsTunnelSupportFloorWorldPoint(
     const FChunkSDFCache& Cache,
     bool bUseSpatialIndex)
 {
+    if (VoxelDensityAblation::IsTunnelCoreOff())
+    {
+        return false;
+    }
     const FVector Pos(WorldX, WorldY, WorldZ);
     const FCachedTunnel* TunnelData = Cache.Tunnels.GetData();
 
@@ -7875,6 +7906,11 @@ void VoxelCaveMorphology::BuildTunnelSupportFloorColumn(
     FTunnelSupportFloorColumn& OutColumn,
     bool bUseSpatialIndex)
 {
+    if (VoxelDensityAblation::IsTunnelCoreOff())
+    {
+        OutColumn.Reset();
+        return;
+    }
     VoxelDensityProfile::FScopedTimer ProfileTimer(
         VoxelDensityProfile::EBucket::TunnelCoreSupport);
     OutColumn.Reset();

Source/VoxelForge/Private/VoxelDensityAblation.cpp

@@ -0,0 +1,131 @@
+// VoxelDensityAblation.cpp
+// Development-only TunnelNetwork ablation controls.
+
+#include "VoxelDensityAblation.h"
+
+#include "HAL/IConsoleManager.h"
+#include "Misc/CommandLine.h"
+#include "Misc/Parse.h"
+
+#include <atomic>
+
+namespace
+{
+    constexpr uint32 UnresolvedMask = 0xFFFFFFFFu;
+    std::atomic<uint32> GResolvedMask(UnresolvedMask);
+
+#if !UE_BUILD_SHIPPING
+    int32 GCaveWarp = 0;
+    int32 GDetailOps = 0;
+    int32 GRoomSDF = 0;
+    int32 GTunnelSDF = 0;
+    int32 GTunnelCore = 0;
+    int32 GPassageCarving = 0;
+    int32 GPassageStructuralPosts = 0;
+    int32 GNativeFloor = 0;
+    int32 GDisturbances = 0;
+    int32 GOriginSpine = 0;
+    int32 GBoundarySeal = 0;
+    int32 GLandingPosts = 0;
+    int32 GXYEdgeSeal = 0;
+    int32 GPitChimneySDF = 0;
+
+#define VF_ABLATION_CVAR(Name, Storage) \
+    FAutoConsoleVariableRef CVar##Storage( \
+        Name, Storage, \
+        TEXT("WORLD-CHANGING DEVELOPMENT-ONLY measurement override. Forces this " \
+             "TunnelNetwork density stage off; never use as a gameplay switch. " \
+             "All peers and regenerated worlds must use the same value. Resolved once " \
+             "per process. 0=on, 1=off."), ECVF_Default)
+
+    VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateCaveWarp"), GCaveWarp);
+    VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateDetailOps"), GDetailOps);
+    VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateRoomSDF"), GRoomSDF);
+    VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateTunnelSDF"), GTunnelSDF);
+    VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateTunnelCore"), GTunnelCore);
+    VF_ABLATION_CVAR(TEXT("voxel.TunnelAblatePassageCarving"), GPassageCarving);
+    VF_ABLATION_CVAR(TEXT("voxel.TunnelAblatePassageStructuralPosts"), GPassageStructuralPosts);
+    VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateNativeFloor"), GNativeFloor);
+    VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateDisturbances"), GDisturbances);
+    VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateOriginSpine"), GOriginSpine);
+    VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateBoundarySeal"), GBoundarySeal);
+    VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateLandingPosts"), GLandingPosts);
+    VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateXYEdgeSeal"), GXYEdgeSeal);
+    VF_ABLATION_CVAR(TEXT("voxel.TunnelAblatePitChimneySDF"), GPitChimneySDF);
+
+#undef VF_ABLATION_CVAR
+
+    uint32 ResolveValue(const TCHAR* Name, int32& Storage)
+    {
+        int32 Value = Storage;
+        FParse::Value(FCommandLine::Get(), Name, Value);
+        Storage = Value != 0 ? 1 : 0;
+        return Storage != 0 ? 1u : 0u;
+    }
+
+    uint32 ResolveMask()
+    {
+        uint32 Mask = 0;
+        Mask |= ResolveValue(TEXT("voxel.TunnelAblateCaveWarp="), GCaveWarp)
+            * static_cast<uint32>(VoxelDensityAblation::EStage::CaveWarp);
+        Mask |= ResolveValue(TEXT("voxel.TunnelAblateDetailOps="), GDetailOps)
+            * static_cast<uint32>(VoxelDensityAblation::EStage::DetailOps);
+        Mask |= ResolveValue(TEXT("voxel.TunnelAblateRoomSDF="), GRoomSDF)
+            * static_cast<uint32>(VoxelDensityAblation::EStage::RoomSDF);
+        Mask |= ResolveValue(TEXT("voxel.TunnelAblateTunnelSDF="), GTunnelSDF)
+            * static_cast<uint32>(VoxelDensityAblation::EStage::TunnelSDF);
+        Mask |= ResolveValue(TEXT("voxel.TunnelAblateTunnelCore="), GTunnelCore)
+            * static_cast<uint32>(VoxelDensityAblation::EStage::TunnelCore);
+        Mask |= ResolveValue(TEXT("voxel.TunnelAblatePassageCarving="), GPassageCarving)
+            * static_cast<uint32>(VoxelDensityAblation::EStage::PassageCarving);
+        Mask |= ResolveValue(
+            TEXT("voxel.TunnelAblatePassageStructuralPosts="), GPassageStructuralPosts)
+            * static_cast<uint32>(VoxelDensityAblation::EStage::PassageStructuralPosts);
+        Mask |= ResolveValue(TEXT("voxel.TunnelAblateNativeFloor="), GNativeFloor)
+            * static_cast<uint32>(VoxelDensityAblation::EStage::NativeFloor);
+        Mask |= ResolveValue(TEXT("voxel.TunnelAblateDisturbances="), GDisturbances)
+            * static_cast<uint32>(VoxelDensityAblation::EStage::Disturbances);
+        Mask |= ResolveValue(TEXT("voxel.TunnelAblateOriginSpine="), GOriginSpine)
+            * static_cast<uint32>(VoxelDensityAblation::EStage::OriginSpine);
+        Mask |= ResolveValue(TEXT("voxel.TunnelAblateBoundarySeal="), GBoundarySeal)
+            * static_cast<uint32>(VoxelDensityAblation::EStage::BoundarySeal);
+        Mask |= ResolveValue(TEXT("voxel.TunnelAblateLandingPosts="), GLandingPosts)
+            * static_cast<uint32>(VoxelDensityAblation::EStage::LandingPosts);
+        Mask |= ResolveValue(TEXT("voxel.TunnelAblateXYEdgeSeal="), GXYEdgeSeal)
+            * static_cast<uint32>(VoxelDensityAblation::EStage::XYEdgeSeal);
+        Mask |= ResolveValue(TEXT("voxel.TunnelAblatePitChimneySDF="), GPitChimneySDF)
+            * static_cast<uint32>(VoxelDensityAblation::EStage::PitChimneySDF);
+        return Mask;
+    }
+#endif
+}
+
+namespace VoxelDensityAblation
+{
+    uint32 GetResolvedMask()
+    {
+        uint32 Existing = GResolvedMask.load(std::memory_order_acquire);
+        if (Existing != UnresolvedMask)
+        {
+            return Existing;
+        }
+
+#if UE_BUILD_SHIPPING
+        constexpr uint32 Resolved = 0;
+#else
+        const uint32 Resolved = ResolveMask();
+#endif
+        uint32 Expected = UnresolvedMask;
+        if (!GResolvedMask.compare_exchange_strong(
+                Expected, Resolved, std::memory_order_release, std::memory_order_acquire))
+        {
+            return Expected;
+        }
+
+        UE_LOG(LogTemp, Display,
+            TEXT("[VoxelForgeTunnelAblation] resolved mask=0x%08x "
+                 "(world-changing development measurement overrides; 0=all on)"),
+            Resolved);
+        return Resolved;
+    }
+}

Source/VoxelForge/Private/VoxelDensityOpStack.cpp

@@ -22,6 +22,7 @@
 #include "VoxelStrateComposer.h"
 
 #include "VoxelDensityPrimitives.h"   // VF_ApplyOriginSpine / seals / PassageCarving
+#include "VoxelDensityAblation.h"      // fingerprinted development-only stage measurements
 #include "VoxelCaveMorphology.h"      // VoxelSDF::Capsule, VoxelHash
 #include "VoxelGenerator.h"           // VoxelGenLOD::Eff
 #include "VoxelHeightOp.h"            // FVoxelHeightStack — SurfaceWorld's two height stacks
@@ -1933,6 +1934,10 @@ namespace
         EVoxelOpEffect EffectOverBox(const FBox& VoxelBox,
                                      const FVoxelOpContext& Ctx) const override
         {
+            if (VoxelDensityAblation::IsOriginSpineOff())
+            {
+                return EVoxelOpEffect::Identity;
+            }
             const bool bRoomTouches = Ctx.bUseLatticeProof
                 ? VoxelPassageGeometry::OriginLandingRoomTouchesLattice(
                     VoxelBox, Ctx.LatticeOriginVoxels, Ctx.Step,
@@ -2018,6 +2023,10 @@ namespace
          */
         EVoxelTileClass ClassifyBox(const FBox& VoxelBox, const FVoxelOpContext&) const override
         {
+            if (VoxelDensityAblation::IsBoundarySealOff())
+            {
+                return EVoxelTileClass::Mixed;
+            }
             if (Thickness <= 0.0f || Base <= 0.0f) { return EVoxelTileClass::Mixed; }
 
             constexpr float SafetyMargin = 1.0f;
@@ -2039,6 +2048,10 @@ namespace
         // Hors de sa bande, le seal ne fait rien du tout ; à cheval, il ne peut qu'ajouter du solide.
         EVoxelOpEffect EffectOverBox(const FBox& VoxelBox, const FVoxelOpContext&) const override
         {
+            if (VoxelDensityAblation::IsBoundarySealOff())
+            {
+                return EVoxelOpEffect::Identity;
+            }
             if (Thickness <= 0.0f) { return EVoxelOpEffect::Identity; }
             const bool bTouchesTopBand = ((float)VoxelBox.Max.Z >= TopZ - Thickness) && ((float)VoxelBox.Min.Z <= TopZ);
             const bool bTouchesBotBand = ((float)VoxelBox.Min.Z <= BotZ + Thickness) && ((float)VoxelBox.Max.Z >= BotZ);
@@ -2100,6 +2113,10 @@ namespace
          */
         EVoxelTileClass ClassifyBox(const FBox& VoxelBox, const FVoxelOpContext& Ctx) const override
         {
+            if (VoxelDensityAblation::IsXYEdgeSealOff())
+            {
+                return EVoxelTileClass::Mixed;
+            }
             return VF_XYEdgeSealBoxIsForcedSolid(
                 VoxelBox, Ctx.WorldRadiusVoxels, Ctx.EdgeSealThickness, Base)
                 ? EVoxelTileClass::AllSolid : EVoxelTileClass::Mixed;
@@ -2114,6 +2131,10 @@ namespace
         // In the inner world it is Identity; a box that reaches the radial band can only gain rock.
         EVoxelOpEffect EffectOverBox(const FBox& VoxelBox, const FVoxelOpContext& Ctx) const override
         {
+            if (VoxelDensityAblation::IsXYEdgeSealOff())
+            {
+                return EVoxelOpEffect::Identity;
+            }
             return VF_XYEdgeSealBoxTouchesBand(
                 VoxelBox, Ctx.WorldRadiusVoxels, Ctx.EdgeSealThickness)
                  ? EVoxelOpEffect::FillOnly : EVoxelOpEffect::Identity;
@@ -2177,29 +2198,39 @@ namespace
         EVoxelOpEffect EffectOverBox(const FBox& VoxelBox,
                                      const FVoxelOpContext& Ctx) const override
         {
+            if (VoxelDensityAblation::IsPassageCarvingOff()
+                && VoxelDensityAblation::IsLandingPostsOff()
+                && VoxelDensityAblation::IsPassageStructuralPostsOff()
+                && VoxelDensityAblation::IsOriginSpineOff())
+            {
+                return EVoxelOpEffect::Identity;
+            }
             const UVoxelStrateManager* LiveManager = Manager.Get();
             if (!LiveManager) { return EVoxelOpEffect::Identity; }
-            const bool bOriginFloor = Ctx.bUseLatticeProof
-                ? VoxelPassageGeometry::OriginLandingFloorTouchesLattice(
-                    VoxelBox, Ctx.LatticeOriginVoxels, Ctx.Step,
-                    TopZ, BotZ, Seal, SpineRadius)
-                : VoxelPassageGeometry::OriginLandingFloorTouchesBox(
-                    VoxelBox, TopZ, BotZ, Seal, SpineRadius);
-            const bool bPassageFloor = Ctx.bUseLatticeProof
-                ? LiveManager->AnyPassageLandingFloorNearLattice(
-                    VoxelBox, Ctx.LatticeOriginVoxels, Ctx.Step)
-                : LiveManager->AnyPassageLandingFloorNearBox(
-                    VoxelBox.Min, VoxelBox.Max);
+            const bool bOriginFloor = !VoxelDensityAblation::IsLandingPostsOff()
+                && (Ctx.bUseLatticeProof
+                    ? VoxelPassageGeometry::OriginLandingFloorTouchesLattice(
+                        VoxelBox, Ctx.LatticeOriginVoxels, Ctx.Step,
+                        TopZ, BotZ, Seal, SpineRadius)
+                    : VoxelPassageGeometry::OriginLandingFloorTouchesBox(
+                        VoxelBox, TopZ, BotZ, Seal, SpineRadius));
+            const bool bPassageFloor = !VoxelDensityAblation::IsLandingPostsOff()
+                && (Ctx.bUseLatticeProof
+                    ? LiveManager->AnyPassageLandingFloorNearLattice(
+                        VoxelBox, Ctx.LatticeOriginVoxels, Ctx.Step)
+                    : LiveManager->AnyPassageLandingFloorNearBox(
+                        VoxelBox.Min, VoxelBox.Max));
             if (bOriginFloor || bPassageFloor)
             {
                 // The room carves air, while its support slab force-writes solid. Both
                 // hypotheses must therefore be killed for a box touching that slab.
                 return EVoxelOpEffect::Both;
             }
-            const bool bPassageCarve = Ctx.bUseLatticeProof
-                ? LiveManager->AnyPassageNearLattice(
-                    VoxelBox, Ctx.LatticeOriginVoxels, Ctx.Step)
-                : LiveManager->AnyPassageNearBox(VoxelBox.Min, VoxelBox.Max);
+            const bool bPassageCarve = !VoxelDensityAblation::IsPassageCarvingOff()
+                && (Ctx.bUseLatticeProof
+                    ? LiveManager->AnyPassageNearLattice(
+                        VoxelBox, Ctx.LatticeOriginVoxels, Ctx.Step)
+                    : LiveManager->AnyPassageNearBox(VoxelBox.Min, VoxelBox.Max));
             return bPassageCarve
                  ? EVoxelOpEffect::CarveOnly : EVoxelOpEffect::Identity;
         }
@@ -2212,6 +2243,10 @@ namespace
         float MaxCarveOverBox(const FBox& VoxelBox, const FVoxelOpContext& Ctx,
                               const FVoxelBoxHypotheses& H) const override
         {
+            if (VoxelDensityAblation::IsPassageCarvingOff())
+            {
+                return 0.0f;
+            }
             const UVoxelStrateManager* LiveManager = Manager.Get();
             if (!LiveManager) { return 0.0f; }
             if (!Ctx.bUseLatticeProof)
@@ -3917,6 +3952,10 @@ namespace
         bool TryGetLastTunnelCoreWorldEvaluation(
             FTunnelCoreWorldEvaluation& OutEvaluation) const override
         {
+            if (VoxelDensityAblation::IsTunnelCoreOff())
+            {
+                return false;
+            }
             FState& S = State();
             if (!S.bLastTunnelCoreWorldEvaluationValid
                 || S.LastTunnelCoreEvaluationPosition != S.LastWorldPosition)
@@ -4078,7 +4117,7 @@ namespace
             // un « frame » : sa portée est exactement UN opérateur, donc elle appartient à cet
             // opérateur.
             float WarpedX = WorldX, WarpedY = WorldY, WarpedZ = EffectiveZ;
-            if (P.CaveWarpStrength > 0.0f)
+            if (!VoxelDensityAblation::IsCaveWarpOff() && P.CaveWarpStrength > 0.0f)
             {
                 const float WF = P.CaveWarpFrequency;
                 const float WS = P.CaveWarpStrength;
@@ -4308,68 +4347,77 @@ namespace
             // mais à des coordonnées NON warpées. Sous un modèle de frames il aurait fallu les sortir
             // du frame tout en gardant le canal — exprimable, mais tordu. Dans un opérateur unique la
             // difficulté disparaît : le warp est une variable locale, pas un contexte hérité.
-            auto EvaluatePit = [&](int32 PitIndex)
+            if (!VoxelDensityAblation::IsPitChimneySDFOff())
             {
-                const FCachedPit& Pit = GetCache().Pits[PitIndex];
-                const float DZ = WorldZ - Pit.TopZ;
-                if (DZ >= Pit.BlendK) { return; }
-                if (-DZ > Pit.Depth + Pit.BlendK) { return; }
-
-                const float DX = WorldX - Pit.CenterX;
-                const float DY = WorldY - Pit.CenterY;
-                const float XYDistSq = DX * DX + DY * DY;
-                if (XYDistSq > Pit.BoundXYRadiusSq) { return; }
-
-                float PitSDF;
-                if (DZ <= 0.0f)
+                auto EvaluatePit = [&](int32 PitIndex)
                 {
-                    const float DepthBelow  = -DZ;
-                    float FlareFactor = FMath::Clamp(1.0f - DepthBelow / Pit.FlareDist, 0.0f, 1.0f);
-                    FlareFactor       = FlareFactor * FlareFactor;
-                    const float EffRadius = Pit.Radius + Pit.FlareExtra * FlareFactor;
-                    PitSDF = FMath::Sqrt(XYDistSq) - EffRadius;
-                }
-                else
-                {
-                    PitSDF = FMath::Sqrt(XYDistSq) - (Pit.Radius + Pit.FlareExtra);
-                }
+                    const FCachedPit& Pit = GetCache().Pits[PitIndex];
+                    const float DZ = WorldZ - Pit.TopZ;
+                    if (DZ >= Pit.BlendK) { return; }
+                    if (-DZ > Pit.Depth + Pit.BlendK) { return; }
 
-                CaveSDF = VoxelSDF::SmoothMin(CaveSDF, PitSDF, Pit.BlendK);
-            };
-            VF_ForEachChunkSDFSpatialCandidate(
-                GetCache().PitSpatialIndex, GetCache().Pits.Num(),
-                WorldX, WorldY, EvaluatePit, bUseSpatialIndex);
+                    const float DX = WorldX - Pit.CenterX;
+                    const float DY = WorldY - Pit.CenterY;
+                    const float XYDistSq = DX * DX + DY * DY;
+                    if (XYDistSq > Pit.BoundXYRadiusSq) { return; }
 
-            auto EvaluateChimney = [&](int32 ChimneyIndex)
+                    float PitSDF;
+                    if (DZ <= 0.0f)
+                    {
+                        const float DepthBelow  = -DZ;
+                        float FlareFactor = FMath::Clamp(1.0f - DepthBelow / Pit.FlareDist, 0.0f, 1.0f);
+                        FlareFactor       = FlareFactor * FlareFactor;
+                        const float EffRadius = Pit.Radius + Pit.FlareExtra * FlareFactor;
+                        PitSDF = FMath::Sqrt(XYDistSq) - EffRadius;
+                    }
+                    else
+                    {
+                        PitSDF = FMath::Sqrt(XYDistSq) - (Pit.Radius + Pit.FlareExtra);
+                    }
+
+                    CaveSDF = VoxelSDF::SmoothMin(CaveSDF, PitSDF, Pit.BlendK);
+                };
+            if (!VoxelDensityAblation::IsPitChimneySDFOff())
             {
-                const FCachedChimney& Chim = GetCache().Chimneys[ChimneyIndex];
-                const float DZ = WorldZ - Chim.BottomZ;
-                if (-DZ >= Chim.BlendK) { return; }
-                if (DZ > Chim.Height + Chim.BlendK) { return; }
+                VF_ForEachChunkSDFSpatialCandidate(
+                    GetCache().PitSpatialIndex, GetCache().Pits.Num(),
+                    WorldX, WorldY, EvaluatePit, bUseSpatialIndex);
+            }
 
-                const float DX = WorldX - Chim.CenterX;
-                const float DY = WorldY - Chim.CenterY;
-                const float XYDistSq = DX * DX + DY * DY;
-                if (XYDistSq > Chim.BoundXYRadiusSq) { return; }
-
-                float ChmSDF;
-                if (DZ >= 0.0f)
+                auto EvaluateChimney = [&](int32 ChimneyIndex)
                 {
-                    float FlareFactor = FMath::Clamp(1.0f - DZ / Chim.FlareDist, 0.0f, 1.0f);
-                    FlareFactor       = FlareFactor * FlareFactor;
-                    const float EffRadius = Chim.Radius + Chim.FlareExtra * FlareFactor;
-                    ChmSDF = FMath::Sqrt(XYDistSq) - EffRadius;
-                }
-                else
-                {
-                    ChmSDF = FMath::Sqrt(XYDistSq) - (Chim.Radius + Chim.FlareExtra);
-                }
+                    const FCachedChimney& Chim = GetCache().Chimneys[ChimneyIndex];
+                    const float DZ = WorldZ - Chim.BottomZ;
+                    if (-DZ >= Chim.BlendK) { return; }
+                    if (DZ > Chim.Height + Chim.BlendK) { return; }
 
-                CaveSDF = VoxelSDF::SmoothMin(CaveSDF, ChmSDF, Chim.BlendK);
-            };
-            VF_ForEachChunkSDFSpatialCandidate(
-                GetCache().ChimneySpatialIndex, GetCache().Chimneys.Num(),
-                WorldX, WorldY, EvaluateChimney, bUseSpatialIndex);
+                    const float DX = WorldX - Chim.CenterX;
+                    const float DY = WorldY - Chim.CenterY;
+                    const float XYDistSq = DX * DX + DY * DY;
+                    if (XYDistSq > Chim.BoundXYRadiusSq) { return; }
+
+                    float ChmSDF;
+                    if (DZ >= 0.0f)
+                    {
+                        float FlareFactor = FMath::Clamp(1.0f - DZ / Chim.FlareDist, 0.0f, 1.0f);
+                        FlareFactor       = FlareFactor * FlareFactor;
+                        const float EffRadius = Chim.Radius + Chim.FlareExtra * FlareFactor;
+                        ChmSDF = FMath::Sqrt(XYDistSq) - EffRadius;
+                    }
+                    else
+                    {
+                        ChmSDF = FMath::Sqrt(XYDistSq) - (Chim.Radius + Chim.FlareExtra);
+                    }
+
+                    CaveSDF = VoxelSDF::SmoothMin(CaveSDF, ChmSDF, Chim.BlendK);
+                };
+            if (!VoxelDensityAblation::IsPitChimneySDFOff())
+            {
+                VF_ForEachChunkSDFSpatialCandidate(
+                    GetCache().ChimneySpatialIndex, GetCache().Chimneys.Num(),
+                    WorldX, WorldY, EvaluateChimney, bUseSpatialIndex);
+            }
+            }
 
             InOut.Sdf = CaveSDF;
 
@@ -4378,40 +4426,46 @@ namespace
             // build-time ownership now so the stack can preserve the authored support through its
             // remaining modifiers without a second floor-writing pass. TryGet... below reuses the
             // exact same cached result for the generator's post-disturbance hand-off.
-            const FTunnelSupportFloorColumn* SupportColumn = GetSupportColumn(
-                S.LastWorldPosition);
-            S.LastTunnelCoreWorldEvaluation = VoxelCaveMorphology::EvaluateTunnelCoreWorld(
-                WorldX, WorldY, WorldZ, GetCache(), SupportColumn,
-                bUseSpatialIndex);
-            S.LastTunnelCoreEvaluationPosition = S.LastWorldPosition;
-            S.bLastTunnelCoreWorldEvaluationValid = true;
-            if (S.LastTunnelCoreWorldEvaluation.bSupportFloor
-                || S.LastTunnelCoreWorldEvaluation.bRoomFloor)
+            if (!VoxelDensityAblation::IsTunnelCoreOff())
             {
-                const float StructuralFloorMinimumDensity =
-                    FMath::Max(P.BaseDensity * 2.0f, 1.0f);
-                if (VoxelMath::IsFinite(StructuralFloorMinimumDensity)
-                    && StructuralFloorMinimumDensity > 0.0f)
+                const FTunnelSupportFloorColumn* SupportColumn = GetSupportColumn(
+                    S.LastWorldPosition);
+                S.LastTunnelCoreWorldEvaluation = VoxelCaveMorphology::EvaluateTunnelCoreWorld(
+                    WorldX, WorldY, WorldZ, GetCache(), SupportColumn,
+                    bUseSpatialIndex);
+                S.LastTunnelCoreEvaluationPosition = S.LastWorldPosition;
+                S.bLastTunnelCoreWorldEvaluationValid = true;
+                if (S.LastTunnelCoreWorldEvaluation.bSupportFloor
+                    || S.LastTunnelCoreWorldEvaluation.bRoomFloor)
                 {
-                    InOut.bProtectedStructuralFloor = true;
-                    InOut.StructuralFloorMinimumDensity = StructuralFloorMinimumDensity;
-                    if (VoxelDensityProfile::AreCountersEnabled())
+                    const float StructuralFloorMinimumDensity =
+                        FMath::Max(P.BaseDensity * 2.0f, 1.0f);
+                    if (VoxelMath::IsFinite(StructuralFloorMinimumDensity)
+                        && StructuralFloorMinimumDensity > 0.0f)
                     {
-                        VoxelDensityProfile::AddCounter(
-                            VoxelDensityProfile::ECounter::TunnelAuthoredFloorSamples);
+                        InOut.bProtectedStructuralFloor = true;
+                        InOut.StructuralFloorMinimumDensity = StructuralFloorMinimumDensity;
+                        if (VoxelDensityProfile::AreCountersEnabled())
+                        {
+                            VoxelDensityProfile::AddCounter(
+                                VoxelDensityProfile::ECounter::TunnelAuthoredFloorSamples);
+                        }
                     }
                 }
+
+                // These are the per-sample hand-offs needed by an op-major block.  The scalar path
+                // continues to use FState directly; publishing them here only makes the dependency
+                // explicit for a later modifier and does not alter Density/Sdf.
+                InOut.bHasTunnelCoreWorldEvaluation = true;
+                InOut.TunnelCoreWorldSDF = S.LastTunnelCoreWorldEvaluation.SDF;
+                InOut.bTunnelCoreSupportFloor = S.LastTunnelCoreWorldEvaluation.bSupportFloor;
+                InOut.bTunnelCoreRoomFloor = S.LastTunnelCoreWorldEvaluation.bRoomFloor;
             }
 
-            // These are the per-sample hand-offs needed by an op-major block.  The scalar path
-            // continues to use FState directly; publishing them here only makes the dependency
-            // explicit for a later modifier and does not alter Density/Sdf.
+            // These cache hand-offs remain valid when tunnel core is off; detail operators still
+            // need the room graph and nearest-room ownership.
             InOut.RoomCache = &GetCache();
             InOut.NearestRoomIndex = S.NearestRoom;
-            InOut.bHasTunnelCoreWorldEvaluation = true;
-            InOut.TunnelCoreWorldSDF = S.LastTunnelCoreWorldEvaluation.SDF;
-            InOut.bTunnelCoreSupportFloor = S.LastTunnelCoreWorldEvaluation.bSupportFloor;
-            InOut.bTunnelCoreRoomFloor = S.LastTunnelCoreWorldEvaluation.bRoomFloor;
         }
 
         //---------------------------------------------------------------------
@@ -5418,7 +5472,7 @@ namespace
                                                   && P.VerticalScale != 1.0f)
                                                 ? WorldZ / P.VerticalScale : WorldZ;
                         FVector Query(WorldX, WorldY, EffectiveZ);
-                        if (P.CaveWarpStrength > 0.0f)
+            if (!VoxelDensityAblation::IsCaveWarpOff() && P.CaveWarpStrength > 0.0f)
                         {
                             const float Frequency = P.CaveWarpFrequency;
                             Query.X += VoxelNoise::Perlin3D(
@@ -8543,9 +8597,6 @@ namespace
         FWormFieldSource(const FStrateGenerationParams& InP, int32 Seed)
             : P(InP)
             , SeedU((uint32)Seed)
-            , WormLatticeStep(
-                InP.WormStrength > 0.0f && InP.WormThreshold > 0.0f
-                    ? VoxelWormField::GetLatticeStep() : 0)
         {}
 
         EVoxelOpRole GetRole() const override { return EVoxelOpRole::FieldSource; }
@@ -8585,7 +8636,7 @@ namespace
                 SeedU};
             const float WormValue = VoxelWormField::Evaluate(
                 WorldX, WorldY, WorldZ, P.WormThreshold,
-                WormParameters, WormLatticeStep);
+                WormParameters);
             if (WormValue < P.WormThreshold)
             {
                 const float t = 1.0f - (WormValue / P.WormThreshold);
@@ -8656,9 +8707,7 @@ namespace
             // explicit count cap keeps this check bounded.  The network mask still uses the SDF
             // interval's worst case, so this never assumes a room value that the preceding source
             // did not prove.
-            if (VoxelWormField::GetNoiseMode() == 0
-                && WormLatticeStep <= 1
-                && Ctx.bUseLatticeProof && Ctx.bTightenWarpProof && Ctx.Step >= 1
+            if (Ctx.bUseLatticeProof && Ctx.bTightenWarpProof && Ctx.Step >= 1
                 && VoxelMath::IsFinite(P.WormFrequency)
                 && VoxelMath::IsFinite(P.WormHorizontalBias)
                 && VoxelMath::IsFinite(P.WormThreshold)
@@ -8778,7 +8827,6 @@ namespace
     private:
         FStrateGenerationParams P;
         uint32 SeedU;
-        int32 WormLatticeStep = 0;
     };
 
 #if WITH_EDITOR
@@ -9722,6 +9770,8 @@ namespace VoxelDensityOps
         //    `Sdf < SDFBlendRadius·3` via VF_NearCaveSurface. Voir la note de l'étape B5 là-bas.
         //    L'ORDRE EST CELUI DE L'ORIGINAL et il compte : chacun lit la densité que le précédent
         //    a laissée (le biais de sol est un ajout indépendant appliqué à cette accumulation).
+        if (!VoxelDensityAblation::IsDetailOpsOff())
+        {
         OutStack.Add(MakeUnique<FCaveRoughnessMod>(P, Seed));            // 4b
         OutStack.Add(MakeUnique<FCaveTerraceMod>(P, Seed, RoomPtr));     // 4c — terrasses
         OutStack.Add(MakeUnique<FLayerLineMod>(P, RoomPtr));             // 4c — lignes de strates
@@ -9734,6 +9784,7 @@ namespace VoxelDensityOps
         OutStack.Add(MakeUnique<FDomeMod>(P, RoomPtr));                  // 4g — dômes
         OutStack.Add(MakeUnique<FPinchMod>(P, RoomPtr));                 // 4h — pincement
         OutStack.Add(MakeUnique<FFloorBiasMod>(P, RoomPtr));             // fin 4h — biais de sol
+        }
         if (P.WormStrength > 0.0f && P.WormThreshold > 0.0f)
         {
             OutStack.Add(MakeUnique<FWormFieldSource>(P, Seed));

Source/VoxelForge/Private/VoxelGenerator.cpp

@@ -14,6 +14,7 @@
 #include "VoxelBiomeDefinition.h"
 #include "VoxelNoise.h"   // T2.a: float, SIMD-batched gradient-noise core
 #include "VoxelWormField.h"
+#include "VoxelDensityAblation.h" // fingerprinted development-only stage measurements
 #include "VoxelDensityPrimitives.h"   // spine / seals / passage — shared with the operator stack
 #include "VoxelDensityOpStack.h"      // OPSTACK Phase 1: the opt-in per-strate operator stack
 #include "VoxelHeightOp.h"            // IVoxelBiomeField — the adapter below implements it
@@ -985,6 +986,10 @@ static void ApplyDisturbances(float& MC, float X, float Y, float Z,
     const FStrateDisturbanceParams& D, uint32 Seed, bool bProtectVerticalShaftAir,
     bool bProtectAuthoredTunnelFloor)
 {
+    if (VoxelDensityAblation::IsDisturbancesOff())
+    {
+        return;
+    }
     VoxelDensityProfile::FScopedTimer ProfileTimer(
         VoxelDensityProfile::EBucket::ApplyDisturbances);
     const float InnerTop = D.StrateTopWorldZ - D.BoundarySealThickness;
@@ -2592,7 +2597,7 @@ float UVoxelGenerator::GetDensityAt(float WorldX, float WorldY, float WorldZ) co
         // Le seul point d'entrée de la pile dans le chemin de production. Elle rend la convention
         // MC (négatif = solide) comme les fonctions d'archétype, donc les disturbances et la couche
         // de diff qui suivent ne voient aucune différence.
-        if (CP_UseOpStack)
+        if (!VoxelDensityAblation::IsTunnelCoreOff() && CP_UseOpStack)
         {
             const bool bCanUseFusedEvaluator =
                 GVoxelForgeUseFusedEvaluator != 0
@@ -2751,7 +2756,8 @@ float UVoxelGenerator::GetDensityAt(float WorldX, float WorldY, float WorldZ) co
                     PreDisturbanceTunnelCore);
             }
         }
-        if (!bHavePreDisturbanceTunnelCore && ActiveTunnelCoreCache->bValid)
+        if (!VoxelDensityAblation::IsTunnelCoreOff()
+            && !bHavePreDisturbanceTunnelCore && ActiveTunnelCoreCache->bValid)
         {
             const FTunnelSupportFloorColumn* SupportColumn = nullptr;
             FTunnelSupportFloorColumn EmptySupportColumn;
@@ -2891,7 +2897,8 @@ float UVoxelGenerator::GetDensityAt(float WorldX, float WorldY, float WorldZ) co
         // bridge over a graph tunnel. Reassert the native cached tunnel core here, after every
         // solid floor writer but before the global XY seal. This cache is built once per chunk,
         // never once per voxel.
-        if (ActiveTunnelCoreCache->bValid || CP_UseOpStack)
+        if (!VoxelDensityAblation::IsTunnelCoreOff()
+            && (ActiveTunnelCoreCache->bValid || CP_UseOpStack))
         {
             FTunnelCoreWorldEvaluation TunnelCore;
             bool bHaveTunnelCore = bHavePreDisturbanceTunnelCore;
@@ -3181,7 +3188,7 @@ float UVoxelGenerator::GetDensityWithParams(float WorldX, float WorldY, float Wo
     float WarpedY = WorldY;
     float WarpedZ = EffectiveZ;
 
-    if (Params.CaveWarpStrength > 0.0f)
+    if (!VoxelDensityAblation::IsCaveWarpOff() && Params.CaveWarpStrength > 0.0f)
     {
         const float WF = Params.CaveWarpFrequency;
         const float WS = Params.CaveWarpStrength;
@@ -3472,74 +3479,77 @@ float UVoxelGenerator::GetDensityWithParams(float WorldX, float WorldY, float Wo
         //     transition as tunnel-to-room (no hard seam at PitTopZ)
         //   - bNearCaveSurface becomes true inside the shaft — roughness clamp
         //     prevents fill-back, so this is safe
-        auto EvaluatePit = [&](int32 PitIndex)
+        if (!VoxelDensityAblation::IsPitChimneySDFOff())
         {
-            const FCachedPit& Pit = SDFCache.Pits[PitIndex];
-            const float DZ = WorldZ - Pit.TopZ;  // Negative = below anchor (shaft)
-            if (DZ >= Pit.BlendK) return;       // Above even the blend fringe
-            if (-DZ > Pit.Depth + Pit.BlendK) return;
-
-            const float DX = WorldX - Pit.CenterX;
-            const float DY = WorldY - Pit.CenterY;
-            const float XYDistSq = DX * DX + DY * DY;
-            if (XYDistSq > Pit.BoundXYRadiusSq) return;
-
-            float PitSDF;
-            if (DZ <= 0.0f)
+            auto EvaluatePit = [&](int32 PitIndex)
             {
-                // Shaft: tapered cylinder with flared opening
-                float DepthBelow  = -DZ;
-                float FlareFactor = FMath::Clamp(1.0f - DepthBelow / Pit.FlareDist, 0.0f, 1.0f);
-                FlareFactor       = FlareFactor * FlareFactor;
-                float EffRadius   = Pit.Radius + Pit.FlareExtra * FlareFactor;
-                PitSDF = FMath::Sqrt(XYDistSq) - EffRadius;
-            }
-            else
+                const FCachedPit& Pit = SDFCache.Pits[PitIndex];
+                const float DZ = WorldZ - Pit.TopZ;  // Negative = below anchor (shaft)
+                if (DZ >= Pit.BlendK) return;       // Above even the blend fringe
+                if (-DZ > Pit.Depth + Pit.BlendK) return;
+
+                const float DX = WorldX - Pit.CenterX;
+                const float DY = WorldY - Pit.CenterY;
+                const float XYDistSq = DX * DX + DY * DY;
+                if (XYDistSq > Pit.BoundXYRadiusSq) return;
+
+                float PitSDF;
+                if (DZ <= 0.0f)
+                {
+                    // Shaft: tapered cylinder with flared opening
+                    float DepthBelow  = -DZ;
+                    float FlareFactor = FMath::Clamp(1.0f - DepthBelow / Pit.FlareDist, 0.0f, 1.0f);
+                    FlareFactor       = FlareFactor * FlareFactor;
+                    float EffRadius   = Pit.Radius + Pit.FlareExtra * FlareFactor;
+                    PitSDF = FMath::Sqrt(XYDistSq) - EffRadius;
+                }
+                else
+                {
+                    // Above anchor: only the blend fringe matters here.
+                    // We still pass a SDF so SmoothMin can soften the rim from above.
+                    // Treat this zone as a flat disc at TopZ (XY cylinder, no Z factor)
+                    // so the blend fades horizontally into the room floor.
+                    PitSDF = FMath::Sqrt(XYDistSq) - (Pit.Radius + Pit.FlareExtra);
+                }
+
+                CaveSDF = VoxelSDF::SmoothMin(CaveSDF, PitSDF, Pit.BlendK);
+            };
+            VF_ForEachChunkSDFSpatialCandidate(
+                SDFCache.PitSpatialIndex, SDFCache.Pits.Num(), WorldX, WorldY, EvaluatePit,
+                bUseSpatialIndex);
+
+            auto EvaluateChimney = [&](int32 ChimneyIndex)
             {
-                // Above anchor: only the blend fringe matters here.
-                // We still pass a SDF so SmoothMin can soften the rim from above.
-                // Treat this zone as a flat disc at TopZ (XY cylinder, no Z factor)
-                // so the blend fades horizontally into the room floor.
-                PitSDF = FMath::Sqrt(XYDistSq) - (Pit.Radius + Pit.FlareExtra);
-            }
+                const FCachedChimney& Chim = SDFCache.Chimneys[ChimneyIndex];
+                const float DZ = WorldZ - Chim.BottomZ;  // Positive = above anchor (shaft)
+                if (-DZ >= Chim.BlendK) return;         // Below even the blend fringe
+                if (DZ > Chim.Height + Chim.BlendK) return;
 
-            CaveSDF = VoxelSDF::SmoothMin(CaveSDF, PitSDF, Pit.BlendK);
-        };
-        VF_ForEachChunkSDFSpatialCandidate(
-            SDFCache.PitSpatialIndex, SDFCache.Pits.Num(), WorldX, WorldY, EvaluatePit,
-            bUseSpatialIndex);
+                const float DX = WorldX - Chim.CenterX;
+                const float DY = WorldY - Chim.CenterY;
+                const float XYDistSq = DX * DX + DY * DY;
+                if (XYDistSq > Chim.BoundXYRadiusSq) return;
 
-        auto EvaluateChimney = [&](int32 ChimneyIndex)
-        {
-            const FCachedChimney& Chim = SDFCache.Chimneys[ChimneyIndex];
-            const float DZ = WorldZ - Chim.BottomZ;  // Positive = above anchor (shaft)
-            if (-DZ >= Chim.BlendK) return;         // Below even the blend fringe
-            if (DZ > Chim.Height + Chim.BlendK) return;
+                float ChmSDF;
+                if (DZ >= 0.0f)
+                {
+                    float FlareFactor = FMath::Clamp(1.0f - DZ / Chim.FlareDist, 0.0f, 1.0f);
+                    FlareFactor       = FlareFactor * FlareFactor;
+                    float EffRadius   = Chim.Radius + Chim.FlareExtra * FlareFactor;
+                    ChmSDF = FMath::Sqrt(XYDistSq) - EffRadius;
+                }
+                else
+                {
+                    // Below anchor: flat disc blend into room ceiling
+                    ChmSDF = FMath::Sqrt(XYDistSq) - (Chim.Radius + Chim.FlareExtra);
+                }
 
-            const float DX = WorldX - Chim.CenterX;
-            const float DY = WorldY - Chim.CenterY;
-            const float XYDistSq = DX * DX + DY * DY;
-            if (XYDistSq > Chim.BoundXYRadiusSq) return;
-
-            float ChmSDF;
-            if (DZ >= 0.0f)
-            {
-                float FlareFactor = FMath::Clamp(1.0f - DZ / Chim.FlareDist, 0.0f, 1.0f);
-                FlareFactor       = FlareFactor * FlareFactor;
-                float EffRadius   = Chim.Radius + Chim.FlareExtra * FlareFactor;
-                ChmSDF = FMath::Sqrt(XYDistSq) - EffRadius;
-            }
-            else
-            {
-                // Below anchor: flat disc blend into room ceiling
-                ChmSDF = FMath::Sqrt(XYDistSq) - (Chim.Radius + Chim.FlareExtra);
-            }
-
-            CaveSDF = VoxelSDF::SmoothMin(CaveSDF, ChmSDF, Chim.BlendK);
-        };
-        VF_ForEachChunkSDFSpatialCandidate(
-            SDFCache.ChimneySpatialIndex, SDFCache.Chimneys.Num(),
-            WorldX, WorldY, EvaluateChimney, bUseSpatialIndex);
+                CaveSDF = VoxelSDF::SmoothMin(CaveSDF, ChmSDF, Chim.BlendK);
+            };
+            VF_ForEachChunkSDFSpatialCandidate(
+                SDFCache.ChimneySpatialIndex, SDFCache.Chimneys.Num(),
+                WorldX, WorldY, EvaluateChimney, bUseSpatialIndex);
+        }
 
         // Convert SDF to density carving:
         // CaveSDF < 0 means we're inside a room/tunnel/pit → carve to air
@@ -3563,6 +3573,7 @@ float UVoxelGenerator::GetDensityWithParams(float WorldX, float WorldY, float Wo
     // post-disturbance tail can consume the result without allocating an FVoxelOpSample or
     // invoking the interpreted stack a second time for this sample.
     if (OutTunnelCore != nullptr
+        && !VoxelDensityAblation::IsTunnelCoreOff()
         && Params.RoomDensity > 0.0f && Params.RoomSpacing > 0.0f)
     {
         // The no-column form is the exact scalar reference path: it performs the world-bound and
@@ -3585,10 +3596,11 @@ float UVoxelGenerator::GetDensityWithParams(float WorldX, float WorldY, float Wo
     // seal / modifiers, so we jump to Step 5 instead of returning early.
     const float DetailThreshold = Params.SDFBlendRadius * 3.0f;
     const bool bNearCaveSurface = (CaveSDF < DetailThreshold) && (CaveSDF < FLT_MAX);
+    const bool bRunDetail = !VoxelDensityAblation::IsDetailOpsOff() && bNearCaveSurface;
     if (bCollectFusedDiagnostics && VoxelDensityProfile::AreCountersEnabled())
     {
         VoxelDensityProfile::AddCounter(
-            bNearCaveSurface
+            bRunDetail
                 ? VoxelDensityProfile::ECounter::FusedTunnelDetailSamples
                 : VoxelDensityProfile::ECounter::FusedTunnelDetailSkipped);
     }
@@ -3606,7 +3618,7 @@ float UVoxelGenerator::GetDensityWithParams(float WorldX, float WorldY, float Wo
     // The noise type (fBM, Ridged, Mixed) and optional domain warping are
     // per-strate settings, so each strate can have fundamentally different
     // wall character — smooth lava tubes vs craggy erosion cliffs.
-    if (bNearCaveSurface && Params.SurfaceRoughness > 0.0f)
+    if (bRunDetail && Params.SurfaceRoughness > 0.0f)
     {
         float RoughnessDepth = Params.SurfaceRoughness * 2.0f;
         float DistFromSurface = FMath::Abs(CaveSDF);
@@ -3729,7 +3741,7 @@ float UVoxelGenerator::GetDensityWithParams(float WorldX, float WorldY, float Wo
     //=========================================================================
     // All terrain ops only affect density near cave walls.
     // Deep-solid voxels skip this entire block (bNearCaveSurface = false).
-    if (bNearCaveSurface)
+    if (bRunDetail)
     {
     //=========================================================================
     // PER-ROOM TERRAIN PARAMS
@@ -4276,10 +4288,7 @@ float UVoxelGenerator::GetDensityWithParams(float WorldX, float WorldY, float Wo
             }
 
             bool bWormBlockProofComputed = false;
-            const int32 WormLatticeStep = VoxelWormField::GetLatticeStep();
-            const bool bSkipWormBlock = VoxelWormField::GetNoiseMode() == 0
-                && WormLatticeStep <= 1
-                && GVoxelForgeWormBlockSkip != 0
+            const bool bSkipWormBlock = GVoxelForgeWormBlockSkip != 0
                 && VF_TryGetWormBlockSkip(
                     DensityCacheOwnerId, SeedU, ParamsFingerprint, LayoutVersion,
                     WorldX, WorldY, WorldZ, Params, bWormBlockProofComputed);
@@ -4305,7 +4314,7 @@ float UVoxelGenerator::GetDensityWithParams(float WorldX, float WorldY, float Wo
                     SeedU};
                 const float WormValue = VoxelWormField::Evaluate(
                     WorldX, WorldY, WorldZ, Params.WormThreshold,
-                    WormParameters, WormLatticeStep);
+                    WormParameters);
 
                 if (WormValue < Params.WormThreshold)
                 {
@@ -4370,8 +4379,10 @@ float UVoxelGenerator::GetDensityWithParams(float WorldX, float WorldY, float Wo
         // the graph's own tunnel floor/core are structural route geometry. Direct callers of
         // GetDensityWithParams retain this historical tail; GetDensityAt skips it and applies the
         // same predicates once in its common MC-space post section below both generation paths.
-        const bool bTunnelSupportFloor = VoxelCaveMorphology::IsTunnelSupportFloorWorldPoint(
-            WorldX, WorldY, WorldZ, SDFCache, bUseSpatialIndex);
+        const bool bTunnelCoreEnabled = !VoxelDensityAblation::IsTunnelCoreOff();
+        const bool bTunnelSupportFloor = bTunnelCoreEnabled
+            && VoxelCaveMorphology::IsTunnelSupportFloorWorldPoint(
+                WorldX, WorldY, WorldZ, SDFCache, bUseSpatialIndex);
         // Keep the direct legacy entry point capability-safe for callers outside the canonical
         // operator-stack path; its support band follows the same relieved swept floor.
         if (bTunnelSupportFloor)
@@ -4388,7 +4399,8 @@ float UVoxelGenerator::GetDensityWithParams(float WorldX, float WorldY, float Wo
             }
             Density = FMath::Max(Density, StructuralSolidDensity);
         }
-        const float TunnelCoreSDF = (Params.RoomDensity > 0.0f && Params.RoomSpacing > 0.0f)
+        const float TunnelCoreSDF = bTunnelCoreEnabled
+            && (Params.RoomDensity > 0.0f && Params.RoomSpacing > 0.0f)
             ? VoxelCaveMorphology::EvaluateTunnelCoreWorldSDF(
                 WorldX, WorldY, WorldZ, SDFCache, bUseSpatialIndex)
             : FLT_MAX;

Source/VoxelForge/Private/VoxelStrateManager.cpp

@@ -8,11 +8,11 @@
 #include "VoxelTypes.h"  // For CHUNK_SIZE, VOXEL_SIZE, WorldToChunkCoord
 #include "VoxelCaveMorphology.h"  // For VoxelSDF and VoxelHash
 #include "VoxelDensityPrimitives.h"  // Shared passage carve polarity/strength
+#include "VoxelDensityAblation.h"  // Fingerprinted development-only stage overrides
 #include "VoxelDensityProfile.h"  // Opt-in targeted per-voxel attribution
 #include "VoxelStartupTrace.h"
 #include "VoxelTerrainOpDefinition.h"  // For UVoxelTerrainOpDefinition::ApplyTo
 #include "VoxelBiomeDefinition.h"  // For UVoxelBiomeDefinition (biome context flatten)
-#include "VoxelWormField.h"  // World-changing worm evaluator mode/lattice identity
 #include "HAL/IConsoleManager.h"
 #include "Misc/CommandLine.h"
 #include "Misc/Crc.h"
@@ -2487,6 +2487,11 @@ void UVoxelStrateManager::GeneratePassages()
 
 float UVoxelStrateManager::EvaluateModifierSDF(float WorldX, float WorldY, float WorldZ) const
 {
+    if (VoxelDensityAblation::IsPassageCarvingOff())
+    {
+        return FLT_MAX;
+    }
+
     const FIntVector ChunkCoord(
         FMath::FloorToInt(WorldX / (float)CHUNK_SIZE),
         FMath::FloorToInt(WorldY / (float)CHUNK_SIZE),
@@ -2552,7 +2557,7 @@ float UVoxelStrateManager::EvaluateModifierSDF(float WorldX, float WorldY, float
             // projecting once here selects the nearest immutable floor segment for this sample.
             // Unknown/malformed descriptors deliberately retain the bare capsule and the legacy
             // diagnostic backstop remains available.
-            if (P.bNativeFloorEnabled)
+            if (P.bNativeFloorEnabled && !VoxelDensityAblation::IsNativeFloorOff())
             {
                 float NativeFloorZ = 0.0f;
                 float NativeSupportRadius = 0.0f;
@@ -2593,8 +2598,11 @@ void UVoxelStrateManager::ApplyPassageModifier(
 {
     VoxelDensityProfile::FScopedTimer ProfileTimer(
         VoxelDensityProfile::EBucket::PassageModifier);
-    const float ModSDF = EvaluateModifierSDF(WorldX, WorldY, WorldZ);
-    VF_ApplyPassageCarving(Density, ModSDF, BaseDensity, SealThickness);
+    if (!VoxelDensityAblation::IsPassageCarvingOff())
+    {
+        const float ModSDF = EvaluateModifierSDF(WorldX, WorldY, WorldZ);
+        VF_ApplyPassageCarving(Density, ModSDF, BaseDensity, SealThickness);
+    }
     ApplyPassageLandingAir(Density, WorldX, WorldY, WorldZ, BaseDensity, SealThickness);
 
     const FIntVector ChunkCoord(
@@ -2607,15 +2615,15 @@ void UVoxelStrateManager::ApplyPassageModifier(
     for (const int32 PassageIndex : Nearby)
     {
         const FVoxelPassage& Passage = PassageData[PassageIndex];
-        if (!VoxelPassageGeometry::VerticalShaftConnectorAirMarker()
+        const bool bLandingFloor = !VoxelDensityAblation::IsLandingPostsOff()
             && (VF_IsPassageLandingFloor(Position, Passage.UpperLanding)
-            || VF_IsPassageLandingFloor(Position, Passage.LowerLanding)
-            // A valid native profile owns its D-floor in the shape and in the final MC
-            // composition.  Keep the old support slab only as a fail-closed fallback for a
-            // malformed/non-native descriptor; it must not patch a floor the shape already owns.
-            || (bPassageSupportFloorWritesEnabled
-                && !Passage.bNativeFloorEnabled
-                && VF_IsWalkableTunnelFloor(Passage, Position, this, PassageIndex))))
+                || VF_IsPassageLandingFloor(Position, Passage.LowerLanding));
+        const bool bLegacySupportFloor = !VoxelDensityAblation::IsPassageStructuralPostsOff()
+            && bPassageSupportFloorWritesEnabled
+            && !Passage.bNativeFloorEnabled
+            && VF_IsWalkableTunnelFloor(Passage, Position, this, PassageIndex);
+        if (!VoxelPassageGeometry::VerticalShaftConnectorAirMarker()
+            && (bLandingFloor || bLegacySupportFloor))
         {
             // This is the one bidirectional part of PassageCarveOp: a floor is a proved solid
             // support slab. It is deliberately applied after the air carve so a tube can never
@@ -2636,6 +2644,10 @@ void UVoxelStrateManager::ApplyPassageCarvingOnly(
     float& Density, float WorldX, float WorldY, float WorldZ,
     float BaseDensity, float SealThickness) const
 {
+    if (VoxelDensityAblation::IsPassageCarvingOff())
+    {
+        return;
+    }
     VoxelDensityProfile::FScopedTimer ProfileTimer(
         VoxelDensityProfile::EBucket::PassageModifier);
     const float ModSDF = EvaluateModifierSDF(WorldX, WorldY, WorldZ);
@@ -2646,6 +2658,10 @@ void UVoxelStrateManager::ApplyPassageLandingAir(
     float& Density, float WorldX, float WorldY, float WorldZ,
     float BaseDensity, float SealThickness) const
 {
+    if (VoxelDensityAblation::IsLandingPostsOff())
+    {
+        return;
+    }
     VoxelDensityProfile::FScopedTimer ProfileTimer(
         VoxelDensityProfile::EBucket::PassageLandingAir);
     const FIntVector ChunkCoord(
@@ -2710,6 +2726,10 @@ void UVoxelStrateManager::ApplyPassageTunnelAir(
     float& Density, float WorldX, float WorldY, float WorldZ,
     float BaseDensity, float SealThickness) const
 {
+    if (VoxelDensityAblation::IsPassageStructuralPostsOff())
+    {
+        return;
+    }
     VoxelDensityProfile::FScopedTimer ProfileTimer(
         VoxelDensityProfile::EBucket::PassageTunnelAir);
     const FVector Position(WorldX, WorldY, WorldZ);
@@ -2740,6 +2760,11 @@ void UVoxelStrateManager::ApplyPassageTunnelAirMC(
 void UVoxelStrateManager::ApplyPassageLandingFloorMC(
     float& Density, float WorldX, float WorldY, float WorldZ, float BaseDensity) const
 {
+    if (VoxelDensityAblation::IsLandingPostsOff()
+        && VoxelDensityAblation::IsPassageStructuralPostsOff())
+    {
+        return;
+    }
     VoxelDensityProfile::FScopedTimer ProfileTimer(
         VoxelDensityProfile::EBucket::PassageLandingFloor);
     const FIntVector ChunkCoord(
@@ -2752,12 +2777,15 @@ void UVoxelStrateManager::ApplyPassageLandingFloorMC(
     for (const int32 PassageIndex : Nearby)
     {
         const FVoxelPassage& Passage = PassageData[PassageIndex];
-        if (!VoxelPassageGeometry::VerticalShaftConnectorAirMarker()
+        const bool bLandingFloor = !VoxelDensityAblation::IsLandingPostsOff()
             && (VF_IsPassageLandingFloor(Position, Passage.UpperLanding)
-                || VF_IsPassageLandingFloor(Position, Passage.LowerLanding)
-                || (bPassageSupportFloorWritesEnabled
-                    && !Passage.bNativeFloorEnabled
-                    && VF_IsWalkableTunnelFloor(Passage, Position, this, PassageIndex))))
+                || VF_IsPassageLandingFloor(Position, Passage.LowerLanding));
+        const bool bLegacySupportFloor = !VoxelDensityAblation::IsPassageStructuralPostsOff()
+            && bPassageSupportFloorWritesEnabled
+            && !Passage.bNativeFloorEnabled
+            && VF_IsWalkableTunnelFloor(Passage, Position, this, PassageIndex);
+        if (!VoxelPassageGeometry::VerticalShaftConnectorAirMarker()
+            && (bLandingFloor || bLegacySupportFloor))
         {
             // Result is in MC convention here (negative = solid). This reassertion is the
             // structural floor backstop after the optional MC-space disturbance layer.
@@ -2790,6 +2818,13 @@ void UVoxelStrateManager::ApplyPassageStructuralPostsMC(
     float BaseDensity, float SealThickness,
     bool bProtectAuthoredTunnelFloor) const
 {
+    const bool bDisableStructuralPosts = VoxelDensityAblation::IsPassageStructuralPostsOff();
+    const bool bDisableLandingPosts = VoxelDensityAblation::IsLandingPostsOff();
+    if (bDisableStructuralPosts && bDisableLandingPosts)
+    {
+        return;
+    }
+
     VoxelDensityProfile::FScopedTimer ProfileTimer(
         VoxelDensityProfile::EBucket::PassageStructuralPosts);
 
@@ -2804,7 +2839,7 @@ void UVoxelStrateManager::ApplyPassageStructuralPostsMC(
     const FVector Position(WorldX, WorldY, WorldZ);
     const bool bSuppressFloor =
         VoxelPassageGeometry::VerticalShaftConnectorAirMarker();
-    bool bAnyPassageFloor = false;
+    bool bAnyLandingFloor = false;
     bool bLegacyTunnelSupportFloor = false;
     bool bAnyRoomFloor = false;
     bool bWalkableAir = false;
@@ -2819,36 +2854,37 @@ void UVoxelStrateManager::ApplyPassageStructuralPostsMC(
         const FVoxelPassage& Passage = PassageData[PassageIndex];
 
         const bool bTunnelSupportFloor =
-            bPassageSupportFloorWritesEnabled
+            !bDisableStructuralPosts
+            && bPassageSupportFloorWritesEnabled
             && !Passage.bNativeFloorEnabled
             && VF_IsWalkableTunnelFloor(Passage, Position, this, PassageIndex);
-        if (!bSuppressFloor
+        if (!bSuppressFloor && !bDisableLandingPosts
             && (VF_IsPassageLandingFloor(Position, Passage.UpperLanding)
-                || VF_IsPassageLandingFloor(Position, Passage.LowerLanding)
-                || bTunnelSupportFloor))
+                || VF_IsPassageLandingFloor(Position, Passage.LowerLanding)))
         {
-            bAnyPassageFloor = true;
+            bAnyLandingFloor = true;
         }
-        if (!bSuppressFloor && bTunnelSupportFloor)
+        if (!bSuppressFloor && !bDisableStructuralPosts && bTunnelSupportFloor)
         {
             bLegacyTunnelSupportFloor = true;
         }
 
-        if (!bSuppressFloor
+        if (!bSuppressFloor && !bDisableLandingPosts
             && (VF_IsPassageRoomFloor(Position, Passage.UpperLanding)
                 || VF_IsPassageRoomFloor(Position, Passage.LowerLanding)))
         {
             bAnyRoomFloor = true;
         }
 
-        if (!bWalkableAir
+        if (!bDisableStructuralPosts && !bWalkableAir
             && FVector::DistSquared(Position, Passage.BoundCenter) <= Passage.BoundRadiusSq
             && VF_IsWalkableTunnelAir(Passage, Position, this, PassageIndex))
         {
             bWalkableAir = true;
         }
 
-        if (FVector::DistSquared(Position, Passage.BoundCenter) <= Passage.BoundRadiusSq)
+        if (!bDisableLandingPosts
+            && FVector::DistSquared(Position, Passage.BoundCenter) <= Passage.BoundRadiusSq)
         {
             const FVoxelPassageLanding* Landings[] = {
                 &Passage.UpperLanding, &Passage.LowerLanding };
@@ -2865,8 +2901,8 @@ void UVoxelStrateManager::ApplyPassageStructuralPostsMC(
     // budget. A neighbouring inter-strate landing must not reopen that finite support band; its
     // carve remains valid everywhere else. Legacy callers leave this false and retain the old
     // passage-owned behavior.
-    if (!bProtectAuthoredTunnelFloor
-        && !bAnyPassageFloor && MinLandingSDF < FLT_MAX)
+    if (!bDisableLandingPosts && !bProtectAuthoredTunnelFloor
+        && !bAnyLandingFloor && !bLegacyTunnelSupportFloor && MinLandingSDF < FLT_MAX)
     {
         float InternalDensity = -Density;
         VF_ApplyPassageLandingCarving(
@@ -2874,7 +2910,7 @@ void UVoxelStrateManager::ApplyPassageStructuralPostsMC(
         Density = -InternalDensity;
     }
 
-    if (bAnyPassageFloor)
+    if (bAnyLandingFloor || bLegacyTunnelSupportFloor)
     {
         Density = FMath::Min(Density, -BaseDensity);
     }
@@ -2901,6 +2937,10 @@ void UVoxelStrateManager::ApplyPassageNativeFloorMC(
     float& Density, float WorldX, float WorldY, float WorldZ,
     float BaseDensity) const
 {
+    if (VoxelDensityAblation::IsNativeFloorOff())
+    {
+        return;
+    }
     const FIntVector ChunkCoord(
         FMath::FloorToInt(WorldX / (float)CHUNK_SIZE),
         FMath::FloorToInt(WorldY / (float)CHUNK_SIZE),
@@ -2955,6 +2995,10 @@ void UVoxelStrateManager::ApplyPassageLandingRoomFloorMC(
     float& Density, float WorldX, float WorldY, float WorldZ,
     float BaseDensity) const
 {
+    if (VoxelDensityAblation::IsLandingPostsOff())
+    {
+        return;
+    }
     VoxelDensityProfile::FScopedTimer ProfileTimer(
         VoxelDensityProfile::EBucket::PassageLandingRoomFloor);
     const FIntVector ChunkCoord(
@@ -2979,6 +3023,10 @@ void UVoxelStrateManager::ApplyPassageLandingRoomFloorMC(
 
 bool UVoxelStrateManager::AnyPassageNearBox(const FVector& MinVoxel, const FVector& MaxVoxel) const
 {
+    if (VoxelDensityAblation::IsPassageCarvingOff())
+    {
+        return false;
+    }
     // Le carve d'un passage atteint ModSDF < PASSAGE_BLEND_RADIUS (4, VoxelGenerator.cpp) au-delà de
     // sa surface ; BoundRadius inclut déjà rayon + blend, on re-pad par sécurité (conservatif).
     constexpr float CarvePad = 4.0f;
@@ -5530,7 +5578,12 @@ FStrateGenerationParams UVoxelStrateManager::GetGenerationParams(const FIntVecto
         {
             Result.WormStrength = 0.0f;
         }
-        return VF_ApplyRuntimeRoughnessOverrides(Result);
+        Result = VF_ApplyRuntimeRoughnessOverrides(Result);
+        if (VoxelDensityAblation::IsCaveWarpOff())
+        {
+            Result.CaveWarpStrength = 0.0f;
+        }
+        return Result;
     };
 
 #if WITH_EDITOR
@@ -5885,11 +5938,9 @@ uint64 UVoxelStrateManager::GetGenerationParamsFingerprint() const
         HashValue(Slot.Definition->bUseOperatorStack);
         HashValue(Slot.Definition->bEnableWorms);
         HashValue(VF_WormsForceOff());
-        // The selected evaluator is a world input even though it is deliberately not part of
-        // FStrateGenerationParams (the fixed 83-field memo key). Keep persistent/verdict keys
-        // from crossing an explicit WormNoiseMode/WormLatticeStep experiment.
-        HashValue(VoxelWormField::GetNoiseMode());
-        HashValue(VoxelWormField::GetLatticeStep());
+        // Development-only stage ablations change the field and therefore belong in every
+        // persistent/verdict key even though they are not authored generation parameters.
+        HashValue(VoxelDensityAblation::GetResolvedMask());
         HashValue(Slot.Definition->StrateHeightInChunks);
         HashValue(Slot.Definition->TransitionType);
         HashValue(Slot.Definition->TransitionBlendChunks);

Source/VoxelForge/Private/VoxelWormField.cpp

@@ -1,98 +1,14 @@
 // VoxelWormField.cpp
-// Shared deterministic worm-field evaluation and the measured lattice experiment.
+// Shared deterministic exact worm-field evaluation.
 
 #include "VoxelWormField.h"
 
 #include "VoxelCaveMorphology.h" // VoxelHash::SeedOffset
-#include "VoxelGenerator.h"       // per-worker canonical tile window
 #include "VoxelNoise.h"
 #include "VoxelTypes.h"           // VOXEL_NOISE_SCALE
 
-#include "HAL/IConsoleManager.h"
-#include "Misc/CommandLine.h"
-#include "Misc/Parse.h"
-
-#include <atomic>
-#include <cfloat>
-#include <cstring>
-
 namespace
 {
-    // The selected production mode is resolved once, before a generation stack is allowed to
-    // observe it, so all workers in a process use one world definition. Mode 0 remains the exact
-    // legacy control for measurements and compatibility investigations.
-    int32 GVoxelForgeWormLatticeStep = 0;
-    std::atomic<int32> GResolvedWormLatticeStep(-1);
-    int32 GVoxelForgeWormNoiseMode = 1;
-    std::atomic<int32> GResolvedWormNoiseMode(-1);
-
-    // The value field has the same threshold/strength contract as legacy Perlin.  This small
-    // amplitude retune keeps the authored TunnelNetwork player-fit margin after replacing the
-    // gradient evaluation with the cheaper scalar hash.  It is a code default, not a CVar, so a
-    // client cannot silently choose a different world.
-    constexpr float CheapWormNoiseAmplitude = 1.0f;
-
-    FAutoConsoleVariableRef CVarVoxelForgeWormLatticeStep(
-        TEXT("voxel.WormLatticeStep"),
-        GVoxelForgeWormLatticeStep,
-        TEXT("WORLD-CHANGING development experiment. 0=exact, 2/4=coarse worm lattice with "
-             "trilinear interpolation. All multiplayer peers and regenerated worlds must use "
-             "the same value. Default 0 until measured."),
-        ECVF_Default);
-
-    FAutoConsoleVariableRef CVarVoxelForgeWormNoiseMode(
-        TEXT("voxel.WormNoiseMode"),
-        GVoxelForgeWormNoiseMode,
-        TEXT("WORLD-CHANGING development experiment. 0=legacy gradient Perlin, 1=cheap "
-             "deterministic value-noise worm fields. All multiplayer peers and regenerated "
-             "worlds must use the same value. Default 1 (the measured production mode)."),
-        ECVF_Default);
-
-    int32 ResolveLatticeStep()
-    {
-        int32 Existing = GResolvedWormLatticeStep.load(std::memory_order_acquire);
-        if (Existing >= 0)
-        {
-            return Existing;
-        }
-
-        int32 CommandLineValue = GVoxelForgeWormLatticeStep;
-        FParse::Value(
-            FCommandLine::Get(), TEXT("voxel.WormLatticeStep="), CommandLineValue);
-        const int32 Resolved = CommandLineValue == 2 || CommandLineValue == 4
-            ? CommandLineValue : 0;
-        int32 Expected = -1;
-        if (!GResolvedWormLatticeStep.compare_exchange_strong(
-                Expected, Resolved, std::memory_order_release, std::memory_order_acquire))
-        {
-            return Expected;
-        }
-        GVoxelForgeWormLatticeStep = Resolved;
-        return Resolved;
-    }
-
-    int32 ResolveNoiseMode()
-    {
-        int32 Existing = GResolvedWormNoiseMode.load(std::memory_order_acquire);
-        if (Existing >= 0)
-        {
-            return Existing;
-        }
-
-        int32 CommandLineValue = GVoxelForgeWormNoiseMode;
-        FParse::Value(
-            FCommandLine::Get(), TEXT("voxel.WormNoiseMode="), CommandLineValue);
-        const int32 Resolved = CommandLineValue == 1 ? 1 : 0;
-        int32 Expected = -1;
-        if (!GResolvedWormNoiseMode.compare_exchange_strong(
-                Expected, Resolved, std::memory_order_release, std::memory_order_acquire))
-        {
-            return Expected;
-        }
-        GVoxelForgeWormNoiseMode = Resolved;
-        return Resolved;
-    }
-
     FORCEINLINE FVector3f MakeWormNoiseBase(
         float WorldX,
         float WorldY,
@@ -117,16 +33,11 @@ namespace
         float WorldY,
         float WorldZ,
         const VoxelWormField::FParameters& Parameters,
-        int32 NoiseMode,
         float NoiseScale)
     {
         const FVector3f NoiseBase = MakeWormNoiseBase(
             WorldX, WorldY, WorldZ, Parameters);
-        return FMath::Abs(
-            (NoiseMode == 0
-                ? VoxelNoise::Perlin3D(NoiseBase)
-                : VoxelNoise::ValueNoise3D(NoiseBase, Parameters.Seed, 0x4D3A2F19u))
-            * NoiseScale);
+        return FMath::Abs(VoxelNoise::Perlin3D(NoiseBase) * NoiseScale);
     }
 
     FORCEINLINE float EvaluateN2Field(
@@ -134,17 +45,12 @@ namespace
         float WorldY,
         float WorldZ,
         const VoxelWormField::FParameters& Parameters,
-        int32 NoiseMode,
         float NoiseScale)
     {
         const FVector3f NoiseBase = MakeWormNoiseBase(
             WorldX, WorldY, WorldZ, Parameters);
         const FVector3f N2Position = NoiseBase + FVector3f(137.0f, 259.0f, 431.0f);
-        return FMath::Abs(
-            (NoiseMode == 0
-                ? VoxelNoise::Perlin3D(N2Position)
-                : VoxelNoise::ValueNoise3D(N2Position, Parameters.Seed, 0xA7C15E2Du))
-            * NoiseScale);
+        return FMath::Abs(VoxelNoise::Perlin3D(N2Position) * NoiseScale);
     }
 
     FORCEINLINE float EvaluateExactField(
@@ -154,288 +60,22 @@ namespace
         float Threshold,
         const VoxelWormField::FParameters& Parameters)
     {
-        const int32 NoiseMode = ResolveNoiseMode();
-        const float NoiseScale = VOXEL_NOISE_SCALE
-            * (NoiseMode == 1 ? CheapWormNoiseAmplitude : 1.0f);
+        const float NoiseScale = VOXEL_NOISE_SCALE;
         const float N1 = EvaluateN1Field(
-            WorldX, WorldY, WorldZ, Parameters, NoiseMode, NoiseScale);
+            WorldX, WorldY, WorldZ, Parameters, NoiseScale);
 
-        // N2 is non-negative, so this preserves the old exact evaluator's short-circuit.
+        // N2 is non-negative, so this preserves the exact evaluator's short-circuit.
         if (N1 >= Threshold)
         {
             return N1;
         }
         return N1 + EvaluateN2Field(
-            WorldX, WorldY, WorldZ, Parameters, NoiseMode, NoiseScale);
-    }
-
-    struct FLatticeNode
-    {
-        int32 X = 0;
-        int32 Y = 0;
-        int32 Z = 0;
-        float Value = 0.0f;
-        bool bValid = false;
-    };
-
-    // The shared density grid is traversed z/y/x. Retaining two adjacent lattice planes is
-    // necessary for the z transition; 2048 entries evicted the previous plane and made the
-    // experiment slower than exact evaluation.  This is fixed storage, not a heap allocation, and
-    // remains deterministic on every worker.
-    constexpr uint32 LatticeCacheSize = 32768;
-    static_assert((LatticeCacheSize & (LatticeCacheSize - 1u)) == 0,
-        "The lattice cache size must remain a power of two for the mask lookup.");
-    constexpr int32 TileLatticeAxis = 32;
-    static_assert(static_cast<uint32>(TileLatticeAxis * TileLatticeAxis * TileLatticeAxis)
-                      == LatticeCacheSize,
-        "The direct tile lattice must use the fixed cache storage exactly.");
-
-    struct FLatticeCache
-    {
-        uint32 Seed = 0;
-        uint32 FrequencyBits = 0;
-        uint32 HorizontalBiasBits = 0;
-        uint32 VerticalScaleBits = 0;
-        int32 Step = 0;
-        bool bUseTileWindow = false;
-        FIntVector TileBaseGrid = FIntVector::ZeroValue;
-        int32 TileSampleStep = 0;
-        int32 TileCellsPerAxis = 0;
-        bool bContextValid = false;
-        FLatticeNode Nodes[LatticeCacheSize];
-
-        void SetContext(
-            const VoxelWormField::FParameters& Parameters,
-            int32 InStep,
-            bool InUseTileWindow,
-            const FIntVector& InTileOrigin,
-            int32 InTileSampleStep,
-            int32 InTileCellsPerAxis)
-        {
-            uint32 FrequencyBitsIn = 0;
-            uint32 HorizontalBiasBitsIn = 0;
-            uint32 VerticalScaleBitsIn = 0;
-            FMemory::Memcpy(&FrequencyBitsIn, &Parameters.Frequency, sizeof(uint32));
-            FMemory::Memcpy(&HorizontalBiasBitsIn, &Parameters.HorizontalBias, sizeof(uint32));
-            FMemory::Memcpy(&VerticalScaleBitsIn, &Parameters.VerticalScale, sizeof(uint32));
-            const double WormStepD = static_cast<double>(InStep);
-            const FIntVector InTileBaseGrid(
-                FMath::FloorToInt(static_cast<double>(InTileOrigin.X) / WormStepD) - 2,
-                FMath::FloorToInt(static_cast<double>(InTileOrigin.Y) / WormStepD) - 2,
-                FMath::FloorToInt(static_cast<double>(InTileOrigin.Z) / WormStepD) - 2);
-            if (bContextValid
-                && Seed == Parameters.Seed
-                && FrequencyBits == FrequencyBitsIn
-                && HorizontalBiasBits == HorizontalBiasBitsIn
-                && VerticalScaleBits == VerticalScaleBitsIn
-                && Step == InStep
-                && bUseTileWindow == InUseTileWindow
-                && TileBaseGrid == InTileBaseGrid
-                && TileSampleStep == InTileSampleStep
-                && TileCellsPerAxis == InTileCellsPerAxis)
-            {
-                return;
-            }
-
-            Seed = Parameters.Seed;
-            FrequencyBits = FrequencyBitsIn;
-            HorizontalBiasBits = HorizontalBiasBitsIn;
-            VerticalScaleBits = VerticalScaleBitsIn;
-            Step = InStep;
-            bUseTileWindow = InUseTileWindow;
-            TileBaseGrid = InTileBaseGrid;
-            TileSampleStep = InTileSampleStep;
-            TileCellsPerAxis = InTileCellsPerAxis;
-            bContextValid = true;
-            for (FLatticeNode& Node : Nodes)
-            {
-                Node.bValid = false;
-            }
-        }
-
-        static uint32 Hash(int32 X, int32 Y, int32 Z)
-        {
-            uint32 H = static_cast<uint32>(X) * 0x9E3779B1u;
-            H ^= static_cast<uint32>(Y) * 0x85EBCA77u;
-            H ^= static_cast<uint32>(Z) * 0xC2B2AE3Du;
-            H ^= H >> 16;
-            H *= 0x7FEB352Du;
-            H ^= H >> 15;
-            return H;
-        }
-
-        float Get(int32 X, int32 Y, int32 Z,
-                  const VoxelWormField::FParameters& Parameters,
-                  int32 NoiseMode,
-                  float NoiseScale)
-        {
-            const auto EvaluateNode = [this, &Parameters, NoiseMode, NoiseScale](FLatticeNode& Node,
-                                                            int32 NodeX, int32 NodeY,
-                                                            int32 NodeZ) -> float
-            {
-                if (Node.bValid && Node.X == NodeX && Node.Y == NodeY && Node.Z == NodeZ)
-                {
-                    return Node.Value;
-                }
-                Node.X = NodeX;
-                Node.Y = NodeY;
-                Node.Z = NodeZ;
-                const double StepD = static_cast<double>(Step);
-                const float WorldX = static_cast<float>(static_cast<double>(NodeX) * StepD);
-                const float WorldY = static_cast<float>(static_cast<double>(NodeY) * StepD);
-                const float WorldZ = static_cast<float>(static_cast<double>(NodeZ) * StepD);
-                // The lattice stores N1 only. The requested voxel uses this interpolated N1 for
-                // the threshold decision; N2 remains an exact point query only in the carve
-                // region. This removes the first noise call on the hot above-threshold majority
-                // without making the second noise unconditional.
-                Node.Value = EvaluateN1Field(
-                    WorldX, WorldY, WorldZ, Parameters, NoiseMode, NoiseScale);
-                Node.bValid = true;
-                return Node.Value;
-            };
-
-            if (bUseTileWindow)
-            {
-                const int32 LocalX = X - TileBaseGrid.X;
-                const int32 LocalY = Y - TileBaseGrid.Y;
-                const int32 LocalZ = Z - TileBaseGrid.Z;
-                if (LocalX >= 0 && LocalX < TileLatticeAxis
-                    && LocalY >= 0 && LocalY < TileLatticeAxis
-                    && LocalZ >= 0 && LocalZ < TileLatticeAxis)
-                {
-                    FLatticeNode& Node = Nodes[
-                        (LocalZ * TileLatticeAxis + LocalY) * TileLatticeAxis + LocalX];
-                    return EvaluateNode(Node, X, Y, Z);
-                }
-
-                // A malformed or unusually large tile window must not alter the field's finite
-                // fallback semantics. It is outside the fixed direct table, so evaluate N1 once
-                // for this sample rather than attempting an unbounded allocation.
-                const double StepD = static_cast<double>(Step);
-                return EvaluateN1Field(
-                    static_cast<float>(static_cast<double>(X) * StepD),
-                    static_cast<float>(static_cast<double>(Y) * StepD),
-                    static_cast<float>(static_cast<double>(Z) * StepD),
-                    Parameters, NoiseMode, NoiseScale);
-            }
-
-            const uint32 Start = Hash(X, Y, Z) & (LatticeCacheSize - 1u);
-            for (uint32 Probe = 0; Probe < LatticeCacheSize; ++Probe)
-            {
-                FLatticeNode& Node = Nodes[(Start + Probe) & (LatticeCacheSize - 1u)];
-                if (Node.bValid)
-                {
-                    if (Node.X == X && Node.Y == Y && Node.Z == Z)
-                    {
-                        return Node.Value;
-                    }
-                    continue;
-                }
-
-                Node.X = X;
-                Node.Y = Y;
-                Node.Z = Z;
-                return EvaluateNode(Node, X, Y, Z);
-            }
-
-            // A saturated cache is exceptionally unlikely for one density block. Falling back to
-            // a direct N1 evaluation keeps the result bounded if a caller exceeds it.
-            const double StepD = static_cast<double>(Step);
-            return EvaluateN1Field(
-                static_cast<float>(static_cast<double>(X) * StepD),
-                static_cast<float>(static_cast<double>(Y) * StepD),
-                static_cast<float>(static_cast<double>(Z) * StepD),
-                Parameters, NoiseMode, NoiseScale);
-        }
-    };
-
-    thread_local FLatticeCache GLatticeCache;
-
-    FORCEINLINE bool CanUseLattice(float WorldX, float WorldY, float WorldZ, int32 Step)
-    {
-        if (Step <= 1 || !FMath::IsFinite(WorldX) || !FMath::IsFinite(WorldY)
-            || !FMath::IsFinite(WorldZ))
-        {
-            return false;
-        }
-
-        // The integer grid indices must survive the conversion back to a finite float world
-        // coordinate. Normal VoxelForge worlds are far inside this envelope; pathological input
-        // takes the exact path rather than changing overflow behaviour.
-        constexpr double MaxGridCoordinate = 1000000000.0;
-        return FMath::Abs(static_cast<double>(WorldX) / static_cast<double>(Step))
-                   <= MaxGridCoordinate
-            && FMath::Abs(static_cast<double>(WorldY) / static_cast<double>(Step))
-                   <= MaxGridCoordinate
-            && FMath::Abs(static_cast<double>(WorldZ) / static_cast<double>(Step))
-                   <= MaxGridCoordinate;
-    }
-
-    FORCEINLINE float Lerp(float A, float B, float Alpha)
-    {
-        return A + (B - A) * Alpha;
-    }
-
-    float EvaluateLattice(
-        float WorldX,
-        float WorldY,
-        float WorldZ,
-        const VoxelWormField::FParameters& Parameters,
-        int32 Step,
-        float NoiseScale)
-    {
-        const int32 NoiseMode = ResolveNoiseMode();
-        const bool bUseTileWindow = VoxelGenLOD::TileCellsPerAxis > 0
-            && VoxelGenLOD::TileCellsPerAxis <= CHUNK_SIZE
-            && VoxelGenLOD::SampleStep > 0;
-        GLatticeCache.SetContext(
-            Parameters,
-            Step,
-            bUseTileWindow,
-            VoxelGenLOD::TileOriginVoxels,
-            VoxelGenLOD::SampleStep,
-            VoxelGenLOD::TileCellsPerAxis);
-
-        const double StepD = static_cast<double>(Step);
-        const double GX = static_cast<double>(WorldX) / StepD;
-        const double GY = static_cast<double>(WorldY) / StepD;
-        const double GZ = static_cast<double>(WorldZ) / StepD;
-        const int32 X0 = FMath::FloorToInt(GX);
-        const int32 Y0 = FMath::FloorToInt(GY);
-        const int32 Z0 = FMath::FloorToInt(GZ);
-        const float Tx = static_cast<float>(GX - static_cast<double>(X0));
-        const float Ty = static_cast<float>(GY - static_cast<double>(Y0));
-        const float Tz = static_cast<float>(GZ - static_cast<double>(Z0));
-
-        const float V000 = GLatticeCache.Get(X0, Y0, Z0, Parameters, NoiseMode, NoiseScale);
-        const float V100 = GLatticeCache.Get(X0 + 1, Y0, Z0, Parameters, NoiseMode, NoiseScale);
-        const float V010 = GLatticeCache.Get(X0, Y0 + 1, Z0, Parameters, NoiseMode, NoiseScale);
-        const float V110 = GLatticeCache.Get(X0 + 1, Y0 + 1, Z0, Parameters, NoiseMode, NoiseScale);
-        const float V001 = GLatticeCache.Get(X0, Y0, Z0 + 1, Parameters, NoiseMode, NoiseScale);
-        const float V101 = GLatticeCache.Get(X0 + 1, Y0, Z0 + 1, Parameters, NoiseMode, NoiseScale);
-        const float V011 = GLatticeCache.Get(X0, Y0 + 1, Z0 + 1, Parameters, NoiseMode, NoiseScale);
-        const float V111 = GLatticeCache.Get(X0 + 1, Y0 + 1, Z0 + 1, Parameters, NoiseMode, NoiseScale);
-
-        const float X00 = Lerp(V000, V100, Tx);
-        const float X10 = Lerp(V010, V110, Tx);
-        const float X01 = Lerp(V001, V101, Tx);
-        const float X11 = Lerp(V011, V111, Tx);
-        return Lerp(Lerp(X00, X10, Ty), Lerp(X01, X11, Ty), Tz);
+            WorldX, WorldY, WorldZ, Parameters, NoiseScale);
     }
 }
 
 namespace VoxelWormField
 {
-    int32 GetLatticeStep()
-    {
-        return ResolveLatticeStep();
-    }
-
-    int32 GetNoiseMode()
-    {
-        return ResolveNoiseMode();
-    }
-
     float EvaluateExact(
         float WorldX,
         float WorldY,
@@ -451,21 +91,8 @@ namespace VoxelWormField
         float WorldY,
         float WorldZ,
         float Threshold,
-        const FParameters& Parameters,
-        int32 LatticeStep)
+        const FParameters& Parameters)
     {
-        const int32 NoiseMode = ResolveNoiseMode();
-        const bool bUseLattice = CanUseLattice(WorldX, WorldY, WorldZ, LatticeStep);
-        const float NoiseScale = VOXEL_NOISE_SCALE
-            * (NoiseMode == 1 ? CheapWormNoiseAmplitude : 1.0f);
-        const float N1 = bUseLattice
-            ? EvaluateLattice(WorldX, WorldY, WorldZ, Parameters, LatticeStep, NoiseScale)
-            : EvaluateN1Field(WorldX, WorldY, WorldZ, Parameters, NoiseMode, NoiseScale);
-        if (N1 >= Threshold)
-        {
-            return N1;
-        }
-        return N1 + EvaluateN2Field(
-            WorldX, WorldY, WorldZ, Parameters, NoiseMode, NoiseScale);
+        return EvaluateExactField(WorldX, WorldY, WorldZ, Threshold, Parameters);
     }
 }

Source/VoxelForge/Public/VoxelDensityAblation.h

@@ -0,0 +1,60 @@
+// VoxelDensityAblation.h
+// Development-only, world-changing measurement overrides for TunnelNetwork density stages.
+
+#pragma once
+
+#include "CoreMinimal.h"
+
+#include <atomic>
+
+namespace VoxelDensityAblation
+{
+    /**
+     * A bit in this mask means that the named stage is forced off. These are measurement
+     * overrides, not gameplay settings: they change the generated field, are resolved once per
+     * process, and must match across peers and regenerated worlds.
+     */
+    enum class EStage : uint32
+    {
+        CaveWarp              = 1u << 0,
+        DetailOps             = 1u << 1,
+        RoomSDF               = 1u << 2,
+        TunnelSDF             = 1u << 3,
+        TunnelCore            = 1u << 4,
+        PassageCarving        = 1u << 5,
+        PassageStructuralPosts= 1u << 6,
+        NativeFloor           = 1u << 7,
+        Disturbances          = 1u << 8,
+        OriginSpine           = 1u << 9,
+        BoundarySeal          = 1u << 10,
+        LandingPosts          = 1u << 11,
+        XYEdgeSeal            = 1u << 12,
+        PitChimneySDF         = 1u << 13,
+    };
+
+    /** Resolve command-line/CVar values once and return the process-wide mask. */
+    VOXELFORGE_API uint32 GetResolvedMask();
+
+    FORCEINLINE bool IsForcedOff(EStage Stage)
+    {
+        return (GetResolvedMask() & static_cast<uint32>(Stage)) != 0;
+    }
+
+    FORCEINLINE bool IsCaveWarpOff() { return IsForcedOff(EStage::CaveWarp); }
+    FORCEINLINE bool IsDetailOpsOff() { return IsForcedOff(EStage::DetailOps); }
+    FORCEINLINE bool IsRoomSDFOff() { return IsForcedOff(EStage::RoomSDF); }
+    FORCEINLINE bool IsTunnelSDFOff() { return IsForcedOff(EStage::TunnelSDF); }
+    FORCEINLINE bool IsTunnelCoreOff() { return IsForcedOff(EStage::TunnelCore); }
+    FORCEINLINE bool IsPassageCarvingOff() { return IsForcedOff(EStage::PassageCarving); }
+    FORCEINLINE bool IsPassageStructuralPostsOff()
+    {
+        return IsForcedOff(EStage::PassageStructuralPosts);
+    }
+    FORCEINLINE bool IsNativeFloorOff() { return IsForcedOff(EStage::NativeFloor); }
+    FORCEINLINE bool IsDisturbancesOff() { return IsForcedOff(EStage::Disturbances); }
+    FORCEINLINE bool IsOriginSpineOff() { return IsForcedOff(EStage::OriginSpine); }
+    FORCEINLINE bool IsBoundarySealOff() { return IsForcedOff(EStage::BoundarySeal); }
+    FORCEINLINE bool IsLandingPostsOff() { return IsForcedOff(EStage::LandingPosts); }
+    FORCEINLINE bool IsXYEdgeSealOff() { return IsForcedOff(EStage::XYEdgeSeal); }
+    FORCEINLINE bool IsPitChimneySDFOff() { return IsForcedOff(EStage::PitChimneySDF); }
+}

Source/VoxelForge/Public/VoxelDensityPrimitives.h

@@ -27,6 +27,7 @@
 #include "CoreMinimal.h"
 #include "VoxelTypes.h"   // SmoothStep01
 #include "VoxelPassageGeometry.h" // shared body-sized landing/tunnel geometry
+#include "VoxelDensityAblation.h" // development-only world-changing measurements
 
 //=============================================================================
 // SEAL DE FRONTIÈRE / BOUNDARY SEAL
@@ -43,7 +44,7 @@ FORCEINLINE void VF_ApplyBoundarySeal(float& Density, float WorldZ,
     float StrateTopZ, float StrateBottomZ,
     float Thickness, float BaseDensity)
 {
-    if (Thickness <= 0.0f) return;
+    if (VoxelDensityAblation::IsBoundarySealOff() || Thickness <= 0.0f) return;
 
     const float DistTop = StrateTopZ - WorldZ;     // + si on est sous le plafond
     const float DistBot = WorldZ - StrateBottomZ;  // + si on est au-dessus du sol
@@ -71,6 +72,7 @@ FORCEINLINE void VF_ApplyBoundarySeal(float& Density, float WorldZ,
 FORCEINLINE void VF_ApplyPassageCarving(float& Density, float ModSDF,
     float BaseDensity, float SealThickness)
 {
+    if (VoxelDensityAblation::IsPassageCarvingOff()) return;
     constexpr float PASSAGE_BLEND_RADIUS = 4.0f;
     if (ModSDF >= PASSAGE_BLEND_RADIUS) return;
 
@@ -121,7 +123,7 @@ FORCEINLINE void VF_ApplyPassageLandingCarving(float& Density, float LandingSDF,
 FORCEINLINE void VF_ApplyOriginSpine(float& Density, float WorldX, float WorldY, float WorldZ,
     float StrateTopZ, float StrateBottomZ, float SealThickness, float BaseDensity, float Radius)
 {
-    if (Radius <= 0.0f) return;
+    if (VoxelDensityAblation::IsOriginSpineOff() || Radius <= 0.0f) return;
 
     const VoxelPassageGeometry::FOriginLandingGeometry Geometry =
         VoxelPassageGeometry::BuildOriginLandingGeometry(
@@ -153,7 +155,7 @@ FORCEINLINE void VF_ApplyOriginLandingAir(float& Density,
     float WorldX, float WorldY, float WorldZ,
     float StrateTopZ, float StrateBottomZ, float SealThickness, float BaseDensity, float Radius)
 {
-    if (Radius <= 0.0f) return;
+    if (VoxelDensityAblation::IsLandingPostsOff() || Radius <= 0.0f) return;
     const VoxelPassageGeometry::FOriginLandingGeometry Geometry =
         VoxelPassageGeometry::BuildOriginLandingGeometry(
             StrateTopZ, StrateBottomZ, SealThickness, Radius);
@@ -169,7 +171,7 @@ FORCEINLINE void VF_ApplyOriginLandingFloor(float& Density,
     float WorldX, float WorldY, float WorldZ,
     float StrateTopZ, float StrateBottomZ, float SealThickness, float BaseDensity, float Radius)
 {
-    if (Radius <= 0.0f) return;
+    if (VoxelDensityAblation::IsLandingPostsOff() || Radius <= 0.0f) return;
     const VoxelPassageGeometry::FOriginLandingGeometry Geometry =
         VoxelPassageGeometry::BuildOriginLandingGeometry(
             StrateTopZ, StrateBottomZ, SealThickness, Radius);
@@ -221,7 +223,8 @@ FORCEINLINE void VF_ApplyOriginLandingFloorMC(float& Density,
 FORCEINLINE void VF_ApplyXYEdgeSeal(float& Density, float WorldX, float WorldY,
     float WorldRadiusVoxels, float Thickness, float BaseDensity)
 {
-    if (!(WorldRadiusVoxels > 0.0f) || !(Thickness > 0.0f) || !(BaseDensity > 0.0f)) return;
+    if (VoxelDensityAblation::IsXYEdgeSealOff()
+        || !(WorldRadiusVoxels > 0.0f) || !(Thickness > 0.0f) || !(BaseDensity > 0.0f)) return;
     if (!VoxelMath::IsFinite(WorldX) || !VoxelMath::IsFinite(WorldY)
         || !VoxelMath::IsFinite(WorldRadiusVoxels) || !VoxelMath::IsFinite(Thickness)
         || !VoxelMath::IsFinite(BaseDensity)) return;
@@ -256,7 +259,8 @@ FORCEINLINE void VF_ApplyXYEdgeSeal(float& Density, float WorldX, float WorldY,
 FORCEINLINE void VF_ApplyXYEdgeSealMC(float& Density, float WorldX, float WorldY,
     float WorldRadiusVoxels, float Thickness, float BaseDensity)
 {
-    if (!(WorldRadiusVoxels > 0.0f) || !(Thickness > 0.0f)) return;
+    if (VoxelDensityAblation::IsXYEdgeSealOff()
+        || !(WorldRadiusVoxels > 0.0f) || !(Thickness > 0.0f)) return;
 
     float InternalDensity = -Density;
     VF_ApplyXYEdgeSeal(InternalDensity, WorldX, WorldY,

Source/VoxelForge/Public/VoxelNoise.h

@@ -142,56 +142,6 @@ FORCEINLINE float Perlin3D(const FVector3f& P)
     return Perlin3D(P.X, P.Y, P.Z);
 }
 
-// A smooth, deterministic value-noise sample for the worm-only cost experiment. It keeps the
-// same unit lattice and quintic interpolation as Perlin3D, but uses one seeded scalar hash per
-// corner instead of the eight gradient selections and dot products. It is intentionally not used
-// by the terrain's other noise fields; WormNoiseMode gates it as an explicit world-changing test.
-FORCEINLINE uint32 ValueNoiseHash(int32 X, int32 Y, int32 Z, uint32 Seed, uint32 Salt)
-{
-    uint32 H = Detail::HashCorner(X, Y, Z) ^ Seed ^ Salt;
-    H ^= H >> 16;
-    H *= 0x7FEB352Du;
-    H ^= H >> 15;
-    return H;
-}
-
-FORCEINLINE float ValueNoise3D(const FVector3f& P, uint32 Seed, uint32 Salt)
-{
-    const float XFloor = FMath::FloorToFloat(P.X);
-    const float YFloor = FMath::FloorToFloat(P.Y);
-    const float ZFloor = FMath::FloorToFloat(P.Z);
-    const int32 X = static_cast<int32>(XFloor);
-    const int32 Y = static_cast<int32>(YFloor);
-    const int32 Z = static_cast<int32>(ZFloor);
-    const float Fx = P.X - XFloor;
-    const float Fy = P.Y - YFloor;
-    const float Fz = P.Z - ZFloor;
-    const float Sx = Detail::Fade(Fx);
-    const float Sy = Detail::Fade(Fy);
-    const float Sz = Detail::Fade(Fz);
-    constexpr float HashToSigned = 2.0f / 16777216.0f;
-    const auto Sample = [Seed, Salt, HashToSigned](int32 IX, int32 IY, int32 IZ) -> float
-    {
-        return static_cast<float>(ValueNoiseHash(IX, IY, IZ, Seed, Salt) & 0x00FFFFFFu)
-            * HashToSigned - 1.0f;
-    };
-    const float V000 = Sample(X, Y, Z);
-    const float V100 = Sample(X + 1, Y, Z);
-    const float V010 = Sample(X, Y + 1, Z);
-    const float V110 = Sample(X + 1, Y + 1, Z);
-    const float V001 = Sample(X, Y, Z + 1);
-    const float V101 = Sample(X + 1, Y, Z + 1);
-    const float V011 = Sample(X, Y + 1, Z + 1);
-    const float V111 = Sample(X + 1, Y + 1, Z + 1);
-    const float X00 = Detail::Lerp(V000, V100, Sx);
-    const float X10 = Detail::Lerp(V010, V110, Sx);
-    const float X01 = Detail::Lerp(V001, V101, Sx);
-    const float X11 = Detail::Lerp(V011, V111, Sx);
-    const float Y0 = Detail::Lerp(X00, X10, Sy);
-    const float Y1 = Detail::Lerp(X01, X11, Sy);
-    return Detail::Lerp(Y0, Y1, Sz);
-}
-
 //=============================================================================
 // LIPSCHITZ BOUND FOR THE ACTUAL 3D FIELD
 //=============================================================================

Source/VoxelForge/Public/VoxelWormField.h

@@ -16,16 +16,6 @@ namespace VoxelWormField
         uint32 Seed = 0;
     };
 
-    /**
-     * Return the selected development experiment mode.
-     *
-     * 0 is the exact field.  2 and 4 evaluate the exact field on that many-voxel lattice and
-     * trilinearly interpolate it.  This is intentionally a WORLD-CHANGING development switch:
-     * it must not be changed between multiplayer peers or for an already generated world.
-     */
-    VOXELFORGE_API int32 GetLatticeStep();
-    VOXELFORGE_API int32 GetNoiseMode();
-
     /** Evaluate the exact two-noise field, retaining the N1 threshold short-circuit. */
     VOXELFORGE_API float EvaluateExact(
         float WorldX,
@@ -34,12 +24,11 @@ namespace VoxelWormField
         float Threshold,
         const FParameters& Parameters);
 
-    /** Evaluate the exact field or its selected cached lattice approximation. */
+    /** Evaluate the exact two-noise field. */
     VOXELFORGE_API float Evaluate(
         float WorldX,
         float WorldY,
         float WorldZ,
         float Threshold,
-        const FParameters& Parameters,
-        int32 LatticeStep);
+        const FParameters& Parameters);
 }

Source/VoxelForgeEditor/Private/VoxelForgeExploreCommandlet.cpp

@@ -29,11 +29,11 @@
 #include "VoxelCaveMorphology.h"
 #include "VoxelDiffLayer.h"
 #include "VoxelDensityOpStack.h"
+#include "VoxelDensityAblation.h"
 #include "VoxelDensityProfile.h"
 #include "VoxelGenerator.h"
 #include "VoxelMarchingCubesMesher.h"
 #include "VoxelNoise.h"
-#include "VoxelWormField.h"
 #include "VoxelSettings.h"
 #include "VoxelStackSampler.h"
 #include "VoxelStrateDefinition.h"
@@ -4202,8 +4202,8 @@ FString BuildManifestJson(
     {
         Writer->WriteValue(TEXT("worm_strength"), static_cast<double>(Arguments.WormStrength));
     }
-    Writer->WriteValue(TEXT("worm_lattice_step"), VoxelWormField::GetLatticeStep());
-    Writer->WriteValue(TEXT("worm_noise_mode"), VoxelWormField::GetNoiseMode());
+    Writer->WriteValue(TEXT("tunnel_ablation_mask"),
+        static_cast<int64>(VoxelDensityAblation::GetResolvedMask()));
     WriteTunnelFloorOverrides(*Writer, Arguments);
     Writer->WriteValue(TEXT("room_mouth_rise_override"), Arguments.bRoomMouthRiseOverride);
     if (Arguments.bRoomMouthRiseOverride)
@@ -4478,8 +4478,8 @@ FString BuildExploreJson(
     {
         Writer->WriteValue(TEXT("worm_strength"), static_cast<double>(Arguments.WormStrength));
     }
-    Writer->WriteValue(TEXT("worm_lattice_step"), VoxelWormField::GetLatticeStep());
-    Writer->WriteValue(TEXT("worm_noise_mode"), VoxelWormField::GetNoiseMode());
+    Writer->WriteValue(TEXT("tunnel_ablation_mask"),
+        static_cast<int64>(VoxelDensityAblation::GetResolvedMask()));
     WriteTunnelFloorOverrides(*Writer, Arguments);
     Writer->WriteValue(TEXT("room_mouth_rise_override"), Arguments.bRoomMouthRiseOverride);
     if (Arguments.bRoomMouthRiseOverride)