standalone: the owner's world outside Unreal -- bit-identical density, D3D11 fly-through viewer

Standalone/ (C++20, MSVC /O2 /arch:AVX2 /fp:precise, Build.ps1): copied density pipeline, op stack,
cave morphology, passages, strate manager/composer, noise, DetSinCos, mesher, clipmap selection,
with a UE compatibility layer (Compat/). Owner data exported once to Standalone/data/owner_world.json
by a default-off explore-commandlet exporter (the only plugin-source change). 25 cm voxels.
Parity: seed 0, 3,436 samples (strate edges, negative/far coords, rooms, tunnels, passages,
landings): bit-identical. Viewer: full 7-level clipmap, per-level toggles 1-7, T = round winding
tunnels (standalone option), N/P seed, F wireframe.
Timing NOT yet a baseline: 515 s for 12,054 tiles (L0 70 s, L6 296 s); the compat TMap/TSet are
vector-backed with linear lookup, which the plugin's caches do not expect.

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

Standalone/Build.ps1

@@ -0,0 +1,59 @@
+[CmdletBinding()]
+param()
+
+$ErrorActionPreference = 'Stop'
+$Root = [IO.Path]::GetFullPath($PSScriptRoot)
+$BuildDir = Join-Path $Root 'Build'
+$BinDir = Join-Path $Root 'bin'
+[IO.Directory]::CreateDirectory($BuildDir) | Out-Null
+[IO.Directory]::CreateDirectory($BinDir) | Out-Null
+$VcVars = 'E:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvars64.bat'
+if (-not (Test-Path -LiteralPath $VcVars -PathType Leaf)) { throw "MSVC environment script not found: $VcVars" }
+
+$Sources = @(
+    (Join-Path $Root 'Source\StandaloneViewer.cpp'),
+    (Join-Path $Root 'Compat\UnrealPerlin.cpp'),
+    (Join-Path $Root 'Compat\StandaloneDataAssetGlue.cpp'),
+    (Join-Path $Root 'Source\VoxelForge\Private\VoxelBiomeDefinition.cpp'),
+    (Join-Path $Root 'Source\VoxelForge\Private\VoxelCaveMorphology.cpp'),
+    (Join-Path $Root 'Source\VoxelForge\Private\VoxelDensityAblation.cpp'),
+    (Join-Path $Root 'Source\VoxelForge\Private\VoxelDensityOpStack.cpp'),
+    (Join-Path $Root 'Source\VoxelForge\Private\VoxelDensityProfile.cpp'),
+    (Join-Path $Root 'Source\VoxelForge\Private\VoxelDiffLayer.cpp'),
+    (Join-Path $Root 'Source\VoxelForge\Private\VoxelGenerator.cpp'),
+    (Join-Path $Root 'Source\VoxelForge\Private\VoxelHeightOpStack.cpp'),
+    (Join-Path $Root 'Source\VoxelForge\Private\VoxelMarchingCubesMesher.cpp'),
+    (Join-Path $Root 'Source\VoxelForge\Private\VoxelSettings.cpp'),
+    (Join-Path $Root 'Source\VoxelForge\Private\VoxelStrateComposer.cpp'),
+    (Join-Path $Root 'Source\VoxelForge\Private\VoxelStrateManager.cpp'),
+    (Join-Path $Root 'Source\VoxelForge\Private\VoxelStrateMeasure.cpp'),
+    (Join-Path $Root 'Source\VoxelForge\Private\VoxelTerrainOpDefinition.cpp'),
+    (Join-Path $Root 'Source\VoxelForge\Private\VoxelWormField.cpp')
+)
+foreach ($Source in $Sources) {
+    if (-not (Test-Path -LiteralPath $Source -PathType Leaf)) { throw "Required source is missing: $Source" }
+}
+
+$ResponsePath = Join-Path $BuildDir 'standalone.rsp'
+$RspLines = @(
+    '/nologo', '/std:c++20', '/O2', '/arch:AVX2', '/fp:precise', '/EHsc',
+    '/D_CRT_SECURE_NO_WARNINGS',
+    ('/I"{0}"' -f (Join-Path $Root 'Compat')),
+    ('/I"{0}"' -f (Join-Path $Root 'Source')),
+    ('/I"{0}"' -f (Join-Path $Root 'Source\VoxelForge\Public')),
+    ('/I"{0}"' -f (Join-Path $Root 'Source\VoxelForge\Private')),
+    ('/Fe"{0}"' -f (Join-Path $BinDir 'VoxelForgeStandalone.exe'))
+)
+foreach ($Source in $Sources) { $RspLines += ('"{0}"' -f $Source) }
+$RspLines += @('/link','d3d11.lib','dxgi.lib','d3dcompiler.lib','user32.lib','gdi32.lib')
+[IO.File]::WriteAllLines($ResponsePath,$RspLines,[Text.UTF8Encoding]::new($false))
+
+Push-Location $BuildDir
+try {
+    $CommandLine = 'call "{0}" >nul && cl.exe @"{1}"' -f $VcVars,$ResponsePath
+    & $env:ComSpec /d /s /c $CommandLine
+    if ($LASTEXITCODE -ne 0) { throw "Standalone MSVC build failed with exit code $LASTEXITCODE" }
+} finally {
+    Pop-Location
+}
+Write-Host "Built $((Join-Path $BinDir 'VoxelForgeStandalone.exe'))"