research(standalone): shape world -- 64 m full detail in 0.96 s, whole view in 2.27 s, cold; look not there

Owner's rooms, tunnels, passages, landings and strate shells compiled as shapes, solved along
lattice lines with packed signs; rock detail only in a band sized by its supremum; far levels from
the same shapes; multithreaded meshing. 8 workers, BelowNormal, affinity 0xFF00, zero cache hits:
  full detail (960 tiles): 669 ms shapes + 290 ms mesh = 0.959 s   (was 20.3 s)
  full clipmap (6,498 tiles): 870 ms + 1.398 s = 2.268 s           (was 170.6 s)
Checks: 5,642 passage centreline samples open; smoothed and per-voxel-noise variants both fail the
detail audit; same hash across runs and 1 vs 6 workers. V toggles owner field / shape world.
Look: 6-12% of lattice signs changed; captures show flat planes without detail (passage floor, a
wall band), telescoping tunnel segments, blocky stair patches. Not accepted as the owner's world yet.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MmSoF64BbRFmk9C3p1VsBJ

Standalone/Source/StandaloneViewer.cpp

@@ -1,6 +1,7 @@
 #include "OwnerWorldLoader.h"
 #include "StreamingWorld.h"
 #include "StandaloneResearchTunnels.h"
+#include "StandaloneShapeWorld.h"
 #include "VoxelDensityProfile.h"
 
 #ifdef TEXT
@@ -179,6 +180,7 @@ namespace
         ID3D11RasterizerState* SolidRasterizer=nullptr;
         ID3D11RasterizerState* WireRasterizer=nullptr;
         std::unique_ptr<FStandaloneOwnerWorld> World;
+        std::unique_ptr<FStandaloneShapeWorld> ShapeWorld;
         std::unique_ptr<FStandaloneStreamingGenerator> Streamer;
         FStandaloneMeshCache MeshCache;
         std::string DataPath;
@@ -203,6 +205,11 @@ namespace
         bool bParityChecked=false;
         bool bRoundTunnels=false;
         bool bRoundTunnelEnhanced=true;
+        bool bShapeWorld=false;
+        bool bShapeAuditOnly=false;
+        bool bShapeCompare=false;
+        bool bFarShapeStagePending=false;
+        FStandaloneShapeWorld::EDetailVariant ShapeDetailVariant=FStandaloneShapeWorld::EDetailVariant::Coherent;
         bool bWireframe=false;
         bool bCaptured=false;
         bool bAutoCaptureWritten=false;
@@ -464,6 +471,8 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
 
         bool ConfigureWorld(std::string& Error)
         {
+            FStandaloneShapeWorldAccess::SetActive(nullptr);
+            ShapeWorld.reset();
             World=std::make_unique<FStandaloneOwnerWorld>();
             if(!StandaloneOwnerLoader::Load(DataPath,*World,Error))return false;
             if(!bParityChecked&&Seed==World->Seed&&!bRoundTunnels)PrintParity();
@@ -480,10 +489,41 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
             }
             if(!PrepareStandaloneDensityWorld(*World,Seed,bRoundTunnels,
                 bRoundTunnelEnhanced,Error))return false;
+            if(bShapeWorld&&!BuildShapeWorldForCamera(Error))return false;
             LoadMeshCache();
             return true;
         }
 
+        bool BuildShapeWorldForCamera(std::string& Error,bool bIncludeFarWorld=false)
+        {
+            const FVector CameraVoxels(Position.X*4.0,Position.Y*4.0,Position.Z*4.0);
+            const FStandaloneDesiredTileSet Desired=StandaloneWorldMesher::BuildDesiredSet(*World,CameraVoxels);
+            FIntVector Min(INT32_MAX,INT32_MAX,INT32_MAX),Max(INT32_MIN,INT32_MIN,INT32_MIN);
+            FIntVector ClipMin(INT32_MAX,INT32_MAX,INT32_MAX),ClipMax(INT32_MIN,INT32_MIN,INT32_MIN);
+            uint64 FineTiles=0;
+            for(const FVoxelTileKey& Tile:Desired.Tiles)
+            {
+                const FIntVector Origin=Tile.OriginVoxels();
+                const int32 Extent=Tile.ExtentVoxels();
+                ClipMin.X=std::min(ClipMin.X,Origin.X);ClipMin.Y=std::min(ClipMin.Y,Origin.Y);ClipMin.Z=std::min(ClipMin.Z,Origin.Z);
+                ClipMax.X=std::max(ClipMax.X,Origin.X+Extent);ClipMax.Y=std::max(ClipMax.Y,Origin.Y+Extent);ClipMax.Z=std::max(ClipMax.Z,Origin.Z+Extent);
+                if(Tile.Level>=World->FullResClipLevels)continue;
+                Min.X=std::min(Min.X,Origin.X);Min.Y=std::min(Min.Y,Origin.Y);Min.Z=std::min(Min.Z,Origin.Z);
+                Max.X=std::max(Max.X,Origin.X+Extent);Max.Y=std::max(Max.Y,Origin.Y+Extent);Max.Z=std::max(Max.Z,Origin.Z+Extent);
+                ++FineTiles;
+            }
+            if(!FineTiles){Error="no full-detail tiles are available for shape compilation";return false;}
+            ShapeWorld=std::make_unique<FStandaloneShapeWorld>();
+            if(!ShapeWorld->Build(*World,Min,Max,ClipMin,ClipMax,WorkerCount,ShapeDetailVariant,bIncludeFarWorld,Error))
+            {ShapeWorld.reset();return false;}
+            FStandaloneShapeWorldAccess::SetActive(ShapeWorld.get());
+            bFarShapeStagePending=bShapeWorld&&!ShapeWorld->HasFarWorld();
+            std::printf("[ShapeRegion] fine_tiles=%llu bounds=(%d,%d,%d)..(%d,%d,%d) clip=(%d,%d,%d)..(%d,%d,%d)\n",
+                static_cast<unsigned long long>(FineTiles),Min.X,Min.Y,Min.Z,Max.X,Max.Y,Max.Z,
+                ClipMin.X,ClipMin.Y,ClipMin.Z,ClipMax.X,ClipMax.Y,ClipMax.Z);
+            return true;
+        }
+
         FStandaloneMeshCacheMetadata MakeMeshCacheMetadata()const
         {
             FStandaloneMeshCacheMetadata Metadata;
@@ -503,7 +543,7 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
         void LoadMeshCache()
         {
             MeshCache.Clear();
-            if(bForceGenerate||!World)return;
+            if(bForceGenerate||bShapeWorld||!World)return;
             const char* ModeSuffix=!bRoundTunnels?"_base":
                 (bRoundTunnelEnhanced?"_round_detailed":"_round_legacy");
             const std::filesystem::path CachePath=std::filesystem::path(DataPath).parent_path()
@@ -529,12 +569,12 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
         {
             StopGeneration();
             ReleaseMeshes();
+            GenerationStart=std::chrono::steady_clock::now();
             std::string Error;
             if(!ConfigureWorld(Error))
             {std::fprintf(stderr,"World load failed: %s\n",Error.c_str());MessageBoxA(Window,Error.c_str(),"VoxelForge viewer",MB_ICONERROR);return;}
             const FVector CameraVoxels(Position.X*4.0,Position.Y*4.0,Position.Z*4.0);
             BuildTargetChunk=StandaloneWorldMesher::CameraChunk(CameraVoxels);
-            GenerationStart=std::chrono::steady_clock::now();
             bFullDetailReported=false;bInitialClipmapReported=false;bAutoCaptureWritten=false;
             if(bProfileAttribution)
             {
@@ -548,7 +588,8 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
             for(int32 I=0;I<=MaxLevels;++I)DesiredByLevel[I]=0;
             for(const FVoxelTileKey& Tile:DesiredTiles)++DesiredByLevel[Tile.Level];
             Streamer=std::make_unique<FStandaloneStreamingGenerator>(*World,WorkerCount,false,
-                MeshCache.IsLoaded()?&MeshCache:nullptr);
+                (!bShapeWorld&&MeshCache.IsLoaded())?&MeshCache:nullptr,
+                bFarShapeStagePending?World->FullResClipLevels-1:-1);
             const FStandaloneStreamingUpdate Update=Streamer->Start(CameraVoxels,{},CrossingIndex);
             FCrossingWork& InitialWork=CrossingWork[CrossingIndex];
             InitialWork.SubmittedJobs=Update.NewJobs;InitialWork.PendingJobs=Update.NewJobs;
@@ -556,8 +597,8 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
             bGenerationRunning=true;bRebuildPending=false;
             const char* TunnelMode=!bRoundTunnels?"":(bRoundTunnelEnhanced
                 ?" with detailed round/winding tunnels":" with legacy round/winding tunnels");
-            std::printf("Streaming seed %d%s: %d desired tiles, %d full-detail tiles, %d workers; upload budget %d batches / %.1f ms per frame.\n",
-                Seed,TunnelMode,Update.DesiredTiles,
+            std::printf("Streaming seed %d%s%s: %d desired tiles, %d full-detail tiles, %d workers; upload budget %d batches / %.1f ms per frame.\n",
+                Seed,TunnelMode,bShapeWorld?" [shape intervals]":"",Update.DesiredTiles,
                 Update.FullResTiles,Streamer->GetWorkerCount(),MaxBatchUploadsPerFrame,BatchUploadBudgetMilliseconds);
             std::fflush(stdout);
         }
@@ -569,6 +610,28 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
             std::printf("Seed changed to %d; replacing the current streaming world.\n",Seed);
         }
 
+        void StartFarShapeGeneration()
+        {
+            if(!bFarShapeStagePending||!ShapeWorld||ShapeWorld->HasFarWorld()||!Streamer)return;
+            ShapeWorld->BuildFarWorld();
+            bFarShapeStagePending=false;
+            Streamer->Stop();
+            std::vector<FVoxelTileKey> ResidentKeys;ResidentKeys.reserve(ResidentTiles.size());
+            for(const auto& Pair:ResidentTiles)ResidentKeys.push_back(Pair.first);
+            Streamer.reset();
+            Streamer=std::make_unique<FStandaloneStreamingGenerator>(*World,WorkerCount,false,nullptr,-1);
+            const FVector CameraVoxels(Position.X*4.0,Position.Y*4.0,Position.Z*4.0);
+            ++CrossingIndex;
+            const FStandaloneStreamingUpdate Update=Streamer->Start(CameraVoxels,ResidentKeys,CrossingIndex);
+            FCrossingWork& Work=CrossingWork[CrossingIndex];
+            Work.SubmittedJobs=Update.NewJobs;Work.PendingJobs=Update.NewJobs;
+            Work.StartTime=std::chrono::steady_clock::now();
+            bGenerationRunning=true;
+            std::printf("[FarStreamStart] desired=%d retained=%d new_jobs=%d workers=%d\n",
+                Update.DesiredTiles,Update.RetainedResidentTiles,Update.NewJobs,WorkerCount);
+            std::fflush(stdout);
+        }
+
         void MarkBatchDirty(const FStandaloneBatchKey& Key)
         {DirtyBatchSet.insert(Key);}
 
@@ -602,6 +665,12 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
             const FVector CameraVoxels(Position.X*4.0,Position.Y*4.0,Position.Z*4.0);
             FStandaloneDesiredTileSet NewDesired=StandaloneWorldMesher::BuildDesiredSet(*World,CameraVoxels);
             if(NewDesired.CenterChunk==BuildTargetChunk)return;
+            if(bShapeWorld)
+            {
+                bRebuildPending=true;
+                std::printf("[ShapeRegion] camera crossed its compiled full-detail bounds; rebuilding the interval region.\n");
+                return;
+            }
             const FIntVector Previous=BuildTargetChunk;
             std::unordered_set<FVoxelTileKey,FStandaloneTileKeyHash> NewSet;
             NewSet.reserve(NewDesired.Tiles.size()*2+1);
@@ -835,6 +904,7 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
                 std::printf("[FullDetailReady] %.3f s after spawn; resident=%zu/%d tiles through LOD%d.\n",
                     Elapsed,ResidentTiles.size(),Streamer->FullResDesiredCount(),World->FullResClipLevels-1);
                 ReportTileTimings();std::fflush(stdout);
+                StartFarShapeGeneration();
             }
             if(!bInitialClipmapReported&&ResidentTiles.size()==DesiredTiles.size()&&DirtyBatchSet.empty())
             {
@@ -873,7 +943,7 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
         void UpdateTitle()
         {
             uint64 VisibleIndices=0;for(const auto& Pair:StreamingBatches)if(bShowLevel[Pair.first.Level])VisibleIndices+=Pair.second.IndexCount;
-            std::ostringstream S;S<<"VoxelForge standalone | seed "<<Seed<<" | "<<(bRoundTunnels?"round/winding research tunnels":"base world")
+            std::ostringstream S;S<<"VoxelForge standalone | seed "<<Seed<<" | "<<(bShapeWorld?"shape-interval owner world":(bRoundTunnels?"round/winding research tunnels":"base world"))
                 <<(bRoundTunnels?(bRoundTunnelEnhanced?" (detailed walls)":" (legacy walls)"):"")
                 <<" | "<<VisibleIndices/3<<" tris | "<<FrameMs<<" ms | "<<(bGenerationRunning?"generating":"ready")
                 <<" | pos "<<std::fixed<<std::setprecision(1)<<Position.X<<", "<<Position.Y<<", "<<Position.Z<<" m";
@@ -945,6 +1015,7 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
             if(W==VK_ESCAPE){if(GApp->bCaptured)GApp->Capture(false);else DestroyWindow(H);}
             if(!bWasDown&&W=='F')GApp->bWireframe=!GApp->bWireframe;
             if(!bWasDown&&W=='T'){GApp->bRoundTunnels=!GApp->bRoundTunnels;GApp->bRebuildPending=true;}
+            if(!bWasDown&&W=='V'){GApp->bShapeWorld=!GApp->bShapeWorld;GApp->bRebuildPending=true;}
             if(!bWasDown&&W=='G'&&GApp->bRoundTunnels)
             {
                 GApp->bRoundTunnelEnhanced=!GApp->bRoundTunnelEnhanced;
@@ -1174,11 +1245,11 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
     };
 
     FDirectedSurfaceDistance DirectedSurfaceDistance(
-        const std::vector<FComparePoint>& From,const std::vector<FComparePoint>& To)
+        const std::vector<FComparePoint>& From,const std::vector<FComparePoint>& To,
+        double BucketWidth=1.0,int32 SearchCells=3)
     {
         FDirectedSurfaceDistance Result;
         if(From.empty()||To.empty()){Result.Unmatched=From.size();return Result;}
-        constexpr double BucketWidth=1.0;
         std::unordered_map<FIntVector,std::vector<const FComparePoint*>,FCompareBucketHash> Buckets;
         Buckets.reserve(To.size());
         const auto BucketOf=[=](const FComparePoint& P)
@@ -1192,7 +1263,9 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
         {
             const FIntVector Center=BucketOf(P);
             double BestSquared=std::numeric_limits<double>::infinity();
-            for(int32 Z=-3;Z<=3;++Z)for(int32 Y=-3;Y<=3;++Y)for(int32 X=-3;X<=3;++X)
+            for(int32 Z=-SearchCells;Z<=SearchCells;++Z)
+            for(int32 Y=-SearchCells;Y<=SearchCells;++Y)
+            for(int32 X=-SearchCells;X<=SearchCells;++X)
             {
                 const auto It=Buckets.find(Center+FIntVector(X,Y,Z));
                 if(It==Buckets.end())continue;
@@ -1212,6 +1285,148 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
         return Result;
     }
 
+    int RunOwnerShapeComparison(FStandaloneOwnerWorld& World,const FStandaloneShapeWorld& Shape,
+                                V3 CameraPosition,int32 Workers,int32 LevelFilter,int32 TileLimit)
+    {
+        if(FStandaloneShapeWorldAccess::GetActive()!=&Shape)
+        {std::fprintf(stderr,"Shape comparison requires the compiled interval world to be active.\n");return 11;}
+        if(LevelFilter>=World.FullResClipLevels&&!Shape.HasFarWorld())
+            const_cast<FStandaloneShapeWorld&>(Shape).BuildFarWorld();
+        const FVector CameraVoxels(CameraPosition.X*4.0,CameraPosition.Y*4.0,CameraPosition.Z*4.0);
+        {
+            const int32 Offsets[][3]={{0,0,0},{4,0,0},{-4,0,0},{0,4,0},{0,-4,0},{0,0,4},{0,0,-4}};
+            for(const auto& Offset:Offsets)
+            {
+                const float X=static_cast<float>(CameraVoxels.X+Offset[0]);
+                const float Y=static_cast<float>(CameraVoxels.Y+Offset[1]);
+                const float Z=static_cast<float>(CameraVoxels.Z+Offset[2]);
+                float OwnerDensity=0.0f;
+                {FStandaloneShapeWorldAccess::FScopedBypass Bypass;
+                    OwnerDensity=World.Generator->GetDensityAt(X,Y,Z);}
+                const float ShapeDensity=Shape.DensityAt(X,Y,Z);
+                std::printf("[ShapeProbe] voxels=(%.1f,%.1f,%.1f) owner=%.5f shape=%.5f owner_air=%d shape_air=%d protected_air=%d solid_overlay=%d\n",
+                    X,Y,Z,OwnerDensity,ShapeDensity,OwnerDensity>=0.0f?1:0,ShapeDensity>=0.0f?1:0,
+                    Shape.DebugCriticalAirAt(X,Y,Z)?1:0,Shape.DebugSolidOverlayAt(X,Y,Z)?1:0);
+            }
+        }
+        const FStandaloneDesiredTileSet Desired=StandaloneWorldMesher::BuildDesiredSet(World,CameraVoxels);
+        std::vector<FVoxelTileKey> Tiles;
+        for(const FVoxelTileKey& Tile:Desired.Tiles)
+            if(LevelFilter<0?Tile.Level<World.FullResClipLevels:Tile.Level==LevelFilter)
+                Tiles.push_back(Tile);
+        if(TileLimit>0&&Tiles.size()>static_cast<size_t>(TileLimit))
+        {
+            std::sort(Tiles.begin(),Tiles.end(),[&](const FVoxelTileKey& A,const FVoxelTileKey& B)
+            {
+                const FIntVector AO=A.OriginVoxels(),BO=B.OriginVoxels();
+                const double ADX=AO.X+A.ExtentVoxels()*0.5-CameraVoxels.X;
+                const double ADY=AO.Y+A.ExtentVoxels()*0.5-CameraVoxels.Y;
+                const double ADZ=AO.Z+A.ExtentVoxels()*0.5-CameraVoxels.Z;
+                const double BDX=BO.X+B.ExtentVoxels()*0.5-CameraVoxels.X;
+                const double BDY=BO.Y+B.ExtentVoxels()*0.5-CameraVoxels.Y;
+                const double BDZ=BO.Z+B.ExtentVoxels()*0.5-CameraVoxels.Z;
+                return ADX*ADX+ADY*ADY+ADZ*ADZ<BDX*BDX+BDY*BDY+BDZ*BDZ;
+            });
+            Tiles.resize(static_cast<size_t>(TileLimit));
+        }
+        if(Tiles.empty()){std::fprintf(stderr,"No tiles are available for the requested shape comparison level.\n");return 12;}
+
+        struct FTileComparison
+        {
+            uint64 Samples=0,Changed=0,MeshMismatch=0;
+            uint64 OldHash=14695981039346656037ull,NewHash=14695981039346656037ull;
+            std::vector<FComparePoint> OldSurface,NewSurface;
+        };
+        std::vector<FTileComparison> Results(Tiles.size());
+        int32 MinChunkZ=MIN_int32,MaxChunkZ=MAX_int32,TopChunkZ=0,BottomChunkZ=0;
+        if(World.Settings->bClampViewToStrate&&World.Manager->GetStrateChunkZBounds(
+            StandaloneWorldMesher::CameraChunk(CameraVoxels).Z,TopChunkZ,BottomChunkZ))
+        {MinChunkZ=BottomChunkZ*CHUNK_SIZE;MaxChunkZ=(TopChunkZ+1)*CHUNK_SIZE;}
+
+        std::atomic<size_t> Next{0};
+        std::vector<std::thread> Threads;
+        const int32 ThreadCount=std::clamp(Workers,1,8);
+        Threads.reserve(ThreadCount);
+        for(int32 Worker=0;Worker<ThreadCount;++Worker)
+        {
+            Threads.emplace_back([&]()
+            {
+                UVoxelMarchingCubesMesher Mesher;
+                Mesher.SetGenerator(World.Generator.get());
+                Mesher.bGenerateSkirts=World.bGenerateSkirts;
+                Mesher.SkirtCells=static_cast<float>(World.SkirtCells);
+                Mesher.LODOctaveDrop=World.LODOctaveDrop;
+                for(;;)
+                {
+                    const size_t Index=Next.fetch_add(1,std::memory_order_relaxed);
+                    if(Index>=Tiles.size())break;
+                    const FVoxelTileKey& Tile=Tiles[Index];
+                    const int32 Cells=Tile.Level<World.FullResClipLevels?CHUNK_SIZE:World.CoarseTileCells;
+                    const int32 Step=std::max(1,Tile.ExtentVoxels()/Cells);
+                    std::vector<float> NewDensities,OldDensities;
+                    FVoxelMeshData NewMesh=Mesher.GenerateMesh(Tile.OriginVoxels(),Step,Cells,nullptr,
+                        MinChunkZ,MaxChunkZ,nullptr,nullptr,nullptr,&NewDensities);
+                    FVoxelMeshData OldMesh;
+                    {
+                        FStandaloneShapeWorldAccess::FScopedBypass Bypass;
+                        OldMesh=Mesher.GenerateMesh(Tile.OriginVoxels(),Step,Cells,nullptr,
+                            MinChunkZ,MaxChunkZ,nullptr,nullptr,nullptr,&OldDensities);
+                    }
+                    FTileComparison& R=Results[Index];
+                    const size_t Shared=std::min(NewDensities.size(),OldDensities.size());
+                    R.Samples=Shared;
+                    R.MeshMismatch=std::max(NewDensities.size(),OldDensities.size())-Shared;
+                    for(size_t I=0;I<Shared;++I)
+                    {
+                        if((NewDensities[I]<0.0f)!=(OldDensities[I]<0.0f))++R.Changed;
+                        R.NewHash^=std::bit_cast<uint32>(NewDensities[I]);R.NewHash*=1099511628211ull;
+                        R.OldHash^=std::bit_cast<uint32>(OldDensities[I]);R.OldHash*=1099511628211ull;
+                    }
+                    constexpr size_t VertexStride=4;
+                    R.NewSurface.reserve(static_cast<size_t>(NewMesh.Vertices.Num())/VertexStride+1);
+                    for(int32 I=0;I<NewMesh.Vertices.Num();I+=static_cast<int32>(VertexStride))
+                    {const FVector& P=NewMesh.Vertices[I];R.NewSurface.push_back({P.X*0.01,P.Y*0.01,P.Z*0.01});}
+                    R.OldSurface.reserve(static_cast<size_t>(OldMesh.Vertices.Num())/VertexStride+1);
+                    for(int32 I=0;I<OldMesh.Vertices.Num();I+=static_cast<int32>(VertexStride))
+                    {const FVector& P=OldMesh.Vertices[I];R.OldSurface.push_back({P.X*0.01,P.Y*0.01,P.Z*0.01});}
+                }
+            });
+        }
+        for(std::thread& Thread:Threads)Thread.join();
+
+        uint64 Samples=0,Changed=0,MeshMismatch=0;
+        uint64 OldHash=14695981039346656037ull,NewHash=14695981039346656037ull;
+        size_t OldVertexCount=0,NewVertexCount=0;
+        std::vector<FComparePoint> OldSurface,NewSurface;
+        for(const FTileComparison& R:Results)
+        {
+            Samples+=R.Samples;Changed+=R.Changed;MeshMismatch+=R.MeshMismatch;
+            OldHash^=R.OldHash;OldHash*=1099511628211ull;
+            NewHash^=R.NewHash;NewHash*=1099511628211ull;
+            OldVertexCount+=R.OldSurface.size();NewVertexCount+=R.NewSurface.size();
+        }
+        OldSurface.reserve(OldVertexCount);NewSurface.reserve(NewVertexCount);
+        for(FTileComparison& R:Results)
+        {
+            OldSurface.insert(OldSurface.end(),R.OldSurface.begin(),R.OldSurface.end());
+            NewSurface.insert(NewSurface.end(),R.NewSurface.begin(),R.NewSurface.end());
+        }
+        const FDirectedSurfaceDistance OldToNew=DirectedSurfaceDistance(OldSurface,NewSurface,1.0,3);
+        const FDirectedSurfaceDistance NewToOld=DirectedSurfaceDistance(NewSurface,OldSurface,1.0,3);
+        const uint64 DistanceSamples=OldToNew.Count+NewToOld.Count;
+        const double MeanDistance=DistanceSamples
+            ?(OldToNew.Sum+NewToOld.Sum)/static_cast<double>(DistanceSamples):0.0;
+        std::printf("[OwnerShapeCompare] tiles=%zu fullres_levels=%d level_filter=%d lattice_samples=%llu changed_signs=%llu changed_share=%.6f%% old_hash=0x%016llx shape_hash=0x%016llx mesh_sample_mismatch=%llu old_surface_samples=%zu shape_surface_samples=%zu symmetric_vertex_mean_m=%.4f symmetric_vertex_max_m=%.4f unmatched_surface_samples=%llu vertex_stride=4 workers=%d\n",
+            Tiles.size(),World.FullResClipLevels,LevelFilter,static_cast<unsigned long long>(Samples),
+            static_cast<unsigned long long>(Changed),Samples?100.0*Changed/Samples:0.0,
+            static_cast<unsigned long long>(OldHash),static_cast<unsigned long long>(NewHash),
+            static_cast<unsigned long long>(MeshMismatch),OldSurface.size(),NewSurface.size(),
+            MeanDistance,std::max(OldToNew.Maximum,NewToOld.Maximum),
+            static_cast<unsigned long long>(OldToNew.Unmatched+NewToOld.Unmatched),ThreadCount);
+        std::fflush(stdout);
+        return Samples>0&&MeshMismatch==0?0:13;
+    }
+
     int RunRoundWallComparison(FStandaloneOwnerWorld& World,V3 CameraPosition,int32 TileCount)
     {
         const FVector CameraVoxels(CameraPosition.X*4.0,CameraPosition.Y*4.0,CameraPosition.Z*4.0);
@@ -1329,6 +1544,7 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
     int RunStreamingBenchmark(FStandaloneOwnerWorld& World,const FVector& CameraPositionVoxels,
                               int32 WorkerCount,int32 MaxLevel,bool bRoundTunnels,
                               bool bEnhancedWalls,const FStandaloneMeshCache* Cache,
+                              bool bHashDensity,
                               const std::string& BakeCachePath,
                               const FStandaloneMeshCacheMetadata& CacheMetadata)
     {
@@ -1349,18 +1565,21 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
         std::array<uint64,MaxLevels+1> SamplesByLevel{};
         std::array<uint64,MaxLevels+1> VerticesByLevel{};
         std::array<uint64,MaxLevels+1> IndicesByLevel{};
+        std::array<uint64,MaxLevels+1> TilesByLevel{};
         std::array<double,MaxLevels+1> WorkerSecondsByLevel{};
         std::vector<FStandaloneCpuTile> CacheTiles;
         if(!BakeCachePath.empty())CacheTiles.reserve(Desired.Tiles.size());
         const auto Start=std::chrono::steady_clock::now();
-        FStandaloneStreamingGenerator Streamer(World,WorkerCount,true,Cache,MaxLevel);
+        FStandaloneStreamingGenerator Streamer(World,WorkerCount,
+            bHashDensity||!BakeCachePath.empty(),Cache,MaxLevel);
         const FStandaloneStreamingUpdate Update=Streamer.Start(CameraPositionVoxels);
         const double LOD0Width=static_cast<double>(2*World.ClipRadius+2)
             *CHUNK_SIZE*VOXEL_SIZE/100.0;
-        std::printf("[StreamBenchmarkConfig] clip_radius=%d lod0_cube=%.0fm voxel=25cm fullres_levels=%d max_level_filter=%d workers=%d full_detail_tiles=%d desired_tiles=%d variant=%s\n",
+        std::printf("[StreamBenchmarkConfig] clip_radius=%d lod0_cube=%.0fm voxel=25cm fullres_levels=%d max_level_filter=%d workers=%d full_detail_tiles=%d desired_tiles=%d variant=%s hash=%s\n",
             World.ClipRadius,LOD0Width,World.FullResClipLevels,MaxLevel<0?World.MaxClipLevel:MaxLevel,
             Streamer.GetWorkerCount(),FullDetailExpected,Update.DesiredTiles,
-            bRoundTunnels?(bEnhancedWalls?"round-detailed":"round-legacy"):"base");
+            bRoundTunnels?(bEnhancedWalls?"round-detailed":"round-legacy"):"base",
+            (bHashDensity||!BakeCachePath.empty())?"on":"off");
         std::fflush(stdout);
         int32 Finished=0,FullDetailFinished=0;
         bool bFullDetailTimeReported=false;
@@ -1383,6 +1602,7 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
                     SamplesByLevel[Level]+=Tile.DensitySamples;
                     VerticesByLevel[Level]+=Tile.Vertices.size();
                     IndicesByLevel[Level]+=Tile.Indices.size();
+                    ++TilesByLevel[Level];
                     WorkerSecondsByLevel[Level]+=Tile.WorkerSeconds;
                     if(Tile.bHasDensityHash)HashRows[Level].push_back({Tile.Key,Tile.DensityHash});
                 }
@@ -1397,31 +1617,48 @@ float3 Lit=Rock*(Ambient+0.88*Diffuse)+float3(0.50,0.69,0.82)*Head*0.75;
                 std::vector<FHashedTile> FullRows;
                 for(int32 Level=0;Level<World.FullResClipLevels&&Level<=MaxLevels;++Level)
                     FullRows.insert(FullRows.end(),HashRows[Level].begin(),HashRows[Level].end());
-                std::printf("[StreamFullDetail] wall=%.3fs generated=%d/%d resident_tiles_cpu_only=1 density_hash=0x%016llx\n",
-                    FullDetailSeconds,FullDetailFinished,FullDetailExpected,
-                    static_cast<unsigned long long>(HashTileRows(FullRows)));
+                if(bHashDensity||!BakeCachePath.empty())
+                    std::printf("[StreamFullDetail] wall=%.3fs generated=%d/%d resident_tiles_cpu_only=1 density_hash=0x%016llx\n",
+                        FullDetailSeconds,FullDetailFinished,FullDetailExpected,
+                        static_cast<unsigned long long>(HashTileRows(FullRows)));
+                else
+                    std::printf("[StreamFullDetail] wall=%.3fs generated=%d/%d resident_tiles_cpu_only=1 hash=off\n",
+                        FullDetailSeconds,FullDetailFinished,FullDetailExpected);
                 std::fflush(stdout);
             }
         }
         const double FullClipSeconds=std::chrono::duration<double>(
             std::chrono::steady_clock::now()-Start).count();
         std::vector<FHashedTile> AllRows;
-        for(auto& LevelRows:HashRows)AllRows.insert(AllRows.end(),LevelRows.begin(),LevelRows.end());
-        std::printf("[StreamFullClipmap] wall=%.3fs generated=%d/%d worker_sum=%.3fs tiles=%d density_hash=0x%016llx\n",
-            FullClipSeconds,Finished,DesiredTotal,
-            std::accumulate(WorkerSecondsByLevel.begin(),WorkerSecondsByLevel.end(),0.0),
-            DesiredTotal,static_cast<unsigned long long>(HashTileRows(AllRows)));
+        if(bHashDensity||!BakeCachePath.empty())
+            for(auto& LevelRows:HashRows)AllRows.insert(AllRows.end(),LevelRows.begin(),LevelRows.end());
+        if(bHashDensity||!BakeCachePath.empty())
+            std::printf("[StreamFullClipmap] wall=%.3fs generated=%d/%d worker_sum=%.3fs tiles=%d density_hash=0x%016llx\n",
+                FullClipSeconds,Finished,DesiredTotal,
+                std::accumulate(WorkerSecondsByLevel.begin(),WorkerSecondsByLevel.end(),0.0),
+                DesiredTotal,static_cast<unsigned long long>(HashTileRows(AllRows)));
+        else
+            std::printf("[StreamFullClipmap] wall=%.3fs generated=%d/%d worker_sum=%.3fs tiles=%d hash=off\n",
+                FullClipSeconds,Finished,DesiredTotal,
+                std::accumulate(WorkerSecondsByLevel.begin(),WorkerSecondsByLevel.end(),0.0),DesiredTotal);
         std::printf("[StreamCacheUse] hits=%llu requested=%d\n",
             static_cast<unsigned long long>(Streamer.GetCacheHits()),DesiredTotal);
         for(int32 Level=0;Level<=MaxLevels;++Level)
         {
-            if(HashRows[Level].empty())continue;
-            const uint64 LevelHash=HashTileRows(HashRows[Level]);
-            std::printf("[StreamLevel] lod=%d tiles=%zu samples=%.3fM worker_sum=%.3fs vertices=%llu indices=%llu density_hash=0x%016llx\n",
-                Level,HashRows[Level].size(),static_cast<double>(SamplesByLevel[Level])/1.0e6,
-                WorkerSecondsByLevel[Level],static_cast<unsigned long long>(VerticesByLevel[Level]),
-                static_cast<unsigned long long>(IndicesByLevel[Level]),
-                static_cast<unsigned long long>(LevelHash));
+            if(TilesByLevel[Level]==0)continue;
+            if(bHashDensity||!BakeCachePath.empty())
+                std::printf("[StreamLevel] lod=%d tiles=%llu samples=%.3fM worker_sum=%.3fs vertices=%llu indices=%llu density_hash=0x%016llx\n",
+                    Level,static_cast<unsigned long long>(TilesByLevel[Level]),
+                    static_cast<double>(SamplesByLevel[Level])/1.0e6,WorkerSecondsByLevel[Level],
+                    static_cast<unsigned long long>(VerticesByLevel[Level]),
+                    static_cast<unsigned long long>(IndicesByLevel[Level]),
+                    static_cast<unsigned long long>(HashTileRows(HashRows[Level])));
+            else
+                std::printf("[StreamLevel] lod=%d tiles=%llu samples=%.3fM worker_sum=%.3fs vertices=%llu indices=%llu hash=off\n",
+                    Level,static_cast<unsigned long long>(TilesByLevel[Level]),
+                    static_cast<double>(SamplesByLevel[Level])/1.0e6,WorkerSecondsByLevel[Level],
+                    static_cast<unsigned long long>(VerticesByLevel[Level]),
+                    static_cast<unsigned long long>(IndicesByLevel[Level]));
         }
         if(!BakeCachePath.empty())
         {
@@ -1447,7 +1684,9 @@ int main(int Argc,char** Argv)
     {if(!JoinedCommandLine.empty())JoinedCommandLine.push_back(' ');JoinedCommandLine+=Argv[I];}
     FCommandLine::Set(JoinedCommandLine);
     int32 BenchmarkLevel=-1,BenchmarkCount=64,StreamBenchmarkMaxLevel=-1;
+    int32 ShapeCompareLevel=-1,ShapeCompareTileLimit=0;
     bool bStreamBenchmark=false;
+    bool bStreamHash=false;
     bool bRoundWallCompare=false;
     int32 RoundCompareTileCount=16;
     std::string BakeMeshCachePath;
@@ -1459,10 +1698,25 @@ int main(int Argc,char** Argv)
         else if(Arg=="--compare-evaluators")App.bCompareEvaluators=true;
         else if(Arg=="--parity-only")App.bParityOnly=true;
         else if(Arg=="--density-hash")App.bDensityHash=true;
+        else if(Arg=="--shape-world")App.bShapeWorld=true;
+        else if(Arg=="--shape-audit")App.bShapeWorld=true,App.bShapeAuditOnly=true;
+        else if(Arg=="--shape-compare")App.bShapeWorld=true,App.bShapeCompare=true;
+        else if(Arg.starts_with("--shape-compare-level="))
+            ShapeCompareLevel=std::atoi(std::string(Arg.substr(std::string_view("--shape-compare-level=").size())).c_str());
+        else if(Arg.starts_with("--shape-compare-tile-limit="))
+            ShapeCompareTileLimit=std::max(0,std::atoi(std::string(Arg.substr(std::string_view("--shape-compare-tile-limit=").size())).c_str()));
+        else if(Arg.starts_with("--shape-detail="))
+        {
+            const std::string_view Value=Arg.substr(15);
+            if(Value=="smooth")App.ShapeDetailVariant=FStandaloneShapeWorld::EDetailVariant::Smooth;
+            else if(Value=="per-voxel")App.ShapeDetailVariant=FStandaloneShapeWorld::EDetailVariant::PerVoxel;
+            else if(Value!="coherent"){std::fprintf(stderr,"Invalid --shape-detail value: %.*s\n",static_cast<int>(Value.size()),Value.data());return 2;}
+        }
         else if(Arg=="--round-tunnels")App.bRoundTunnels=true;
         else if(Arg=="--round-tunnels-legacy")
         {App.bRoundTunnels=true;App.bRoundTunnelEnhanced=false;}
         else if(Arg=="--stream-benchmark")bStreamBenchmark=true;
+        else if(Arg=="--stream-hash")bStreamHash=true;
         else if(Arg=="--compare-round-walls")
         {bRoundWallCompare=true;App.bRoundTunnels=true;}
         else if(Arg.starts_with("--round-compare-tiles="))
@@ -1518,6 +1772,17 @@ int main(int Argc,char** Argv)
     if(App.bRoundTunnels&&!PrepareStandaloneDensityWorld(*App.World,App.Seed,
         App.bRoundTunnels,App.bRoundTunnelEnhanced,Error))
     {std::fprintf(stderr,"Standalone world setup failed: %s\n",Error.c_str());return 2;}
+    const bool bNeedFarShapeWorld=bStreamBenchmark
+        ?(StreamBenchmarkMaxLevel<0||StreamBenchmarkMaxLevel>=App.World->FullResClipLevels)
+        :(App.bShapeCompare?ShapeCompareLevel>=App.World->FullResClipLevels
+          :(BenchmarkLevel>=App.World->FullResClipLevels));
+    if(App.bShapeWorld&&(App.bShapeAuditOnly||App.bShapeCompare||bStreamBenchmark||BenchmarkLevel>=0)
+        &&!App.BuildShapeWorldForCamera(Error,bNeedFarShapeWorld))
+    {std::fprintf(stderr,"Shape interval build failed: %s\n",Error.c_str());return 2;}
+    if(App.bShapeAuditOnly)return App.ShapeWorld->IsDetailAuditPassing()?0:7;
+    if(App.bShapeCompare)
+        return RunOwnerShapeComparison(*App.World,*App.ShapeWorld,App.Position,App.WorkerCount,
+            ShapeCompareLevel,ShapeCompareTileLimit);
     if(bRoundWallCompare)
         return RunRoundWallComparison(*App.World,App.Position,RoundCompareTileCount);
     if(bStreamBenchmark)
@@ -1526,12 +1791,12 @@ int main(int Argc,char** Argv)
             *CHUNK_SIZE*VOXEL_SIZE/100.0;
         std::printf("Standalone clip override: exported radius=%d (112 m cube) -> radius=%d (%.0f m LOD0 cube), voxel size=25 cm.\n",
             ExportClipRadius,App.ClipRadius,FullDetailWidth);
-        if(!App.bForceGenerate)App.LoadMeshCache();
+        if(!App.bForceGenerate&&!App.bShapeWorld)App.LoadMeshCache();
         return RunStreamingBenchmark(*App.World,
             FVector(App.Position.X*4.0,App.Position.Y*4.0,App.Position.Z*4.0),
             App.WorkerCount,StreamBenchmarkMaxLevel,App.bRoundTunnels,
-            App.bRoundTunnelEnhanced,App.MeshCache.IsLoaded()?&App.MeshCache:nullptr,
-            BakeMeshCachePath,App.MakeMeshCacheMetadata());
+            App.bRoundTunnelEnhanced,(!App.bShapeWorld&&App.MeshCache.IsLoaded())?&App.MeshCache:nullptr,
+            bStreamHash,BakeMeshCachePath,App.MakeMeshCacheMetadata());
     }
     if(BenchmarkLevel>=0)
         return RunTileBenchmark(*App.World,App.Position,BenchmarkLevel,BenchmarkCount,
@@ -1546,7 +1811,7 @@ int main(int Argc,char** Argv)
     GApp=&App;
     if(!App.Window||!App.InitializeDevice()){MessageBoxA(nullptr,"Direct3D 11 initialization failed.","VoxelForge standalone",MB_ICONERROR);return 3;}
     ShowWindow(App.Window,SW_SHOW);UpdateWindow(App.Window);
-    std::printf("Controls: hold right mouse to look; WASD move; Space/Ctrl (E/Q) up/down; Shift faster; wheel changes speed; F wireframe; G toggles legacy/detailed round walls; 1-9 toggle LOD; 0 toggle all levels; N/P change seed; T swaps base/round tunnels; Esc quit.\n");
+    std::printf("Controls: hold right mouse to look; WASD move; Space/Ctrl (E/Q) up/down; Shift faster; wheel changes speed; F wireframe; G toggles legacy/detailed round walls; 1-9 toggle LOD; 0 toggle all levels; N/P change seed; T swaps base/round tunnels; V swaps owner density/shape intervals; Esc quit.\n");
     std::printf("Owner data: %s; starting at first-strate open-space sample (%.2f, %.2f, %.2f) m.\n",
         App.DataPath.c_str(),App.Position.X,App.Position.Y,App.Position.Z);
     std::fflush(stdout);