Wonderbox-inspired lighting overhaul across all 3 pixel shaders:
- Hemisphere ambient (sky blue above, warm brown below) replaces flat ambient
- RT shadows lerp toward blue-violet tint instead of plain darkening (factor 0.55)
- Rim light (fresnel) with warm golden color on silhouettes (30% on vegetation)
- Soft exponential tone mapping + saturation boost in final post-process pass
- CB parameters for all lighting values (skyAmbient, groundAmbient, shadowTint, etc.)
- Fog color/density centralized from CB instead of hardcoded per-shader
- Screenshot mode (CLI "screenshot"): fixed camera, AO convergence, auto-capture
- AO noise stability: world-space hash using voxel center + tangent-axis frac position
- AO distance-weighted falloff: continuous occlusion values instead of binary hit/miss
- Normal render target (R16G16B16A16_SNORM) as MRT SV_TARGET1 in all 3 pixel
shaders (voxelPS, voxelTopingPS, voxelSmoothPS) for future RT shadow/AO
- BLAS extraction compute shader (voxelBLASExtractCS.hlsl): converts PackedQuad
StructuredBuffer to float3 position buffer for DXR BLAS input
- Blocky BLAS: single BLAS from all GPU-meshed quads (~1.5M triangles)
- Smooth BLAS: single BLAS from smooth vertex buffer directly
- TLAS: 2 instances (blocky + smooth), identity transforms, CreateBuffer2 with
callback to avoid UpdateBuffer on RAY_TRACING flagged buffers
- Fix: Wicked always accesses index_buffer in CreateRaytracingAccelerationStructure
via to_internal() even for non-indexed geometry — provide dummy valid buffer
Use same ambient (0.15, 0.18, 0.25) as voxel PS instead of greener
tint. Increase translucency (0.6) to reduce contrast when orbiting
around grass. Wrap at 0.85 for balanced lit-side brightness.
Stone: add corner fill triangles at adjacent open edges and cap
triangles at strip terminaisons. Grass: replace bevel strips with
tuft-based grass blades — clusters of 3-9 curved double-sided
blades with per-tuft height/lean personality and hash-driven
placement (quadratic inset 0-0.30 from edge). Vegetation PS uses
half-Lambert wrap lighting + translucency for soft stylized shading
(inspired by Airborn Trees). Stone keeps classic Lambert.
Add instanced rendering for toping bevels: dedicated shaders
(voxelTopingVS/PS), PSO, GPU buffers (t4 vertices, t5 instances),
per-group DrawInstanced in a separate render pass with LoadOp::LOAD.
Fix inverted face winding (emitTri auto-winding condition flipped for
CW front-facing), slope normals (use inward direction not outward),
and PS lighting (negate sunDirection like voxelPS). Update CLAUDE.md
with Phase 4.1/4.2 documentation.
