Samuel Bouchet
aab38bb9b9
Implement CPU-side Naive Surface Nets for smooth voxel surfaces (SmoothStone, Snow) coexisting with blocky voxels (Grass, Dirt, Stone, Sand). Key features: - SmoothMesher with binary SDF, centroid vertex placement, per-axis boundary clamping to align with blocky grid at smooth↔blocky transitions - Cross-chunk connectivity: PAD=2 SDF grid, vertex range [-1, CHUNK_SIZE), canonical edge ownership (no duplicate triangles, no z-fighting) - Face normals oriented by edge axis+sign (robust with binary SDF, unlike SDF gradient dot or centroid sampling approaches) - Y-axis winding fix: sharing cells have different spatial arrangement, requiring opposite winding from X and Z axes - GPU mesher treats smooth neighbors as solid (no blocky faces toward smooth) - Material blending: primary (smooth-only) + secondary (all counts) per vertex - Dedicated shaders: voxelSmoothVS (vertex pulling t6) + voxelSmoothPS (triplanar + lerp blending between two materials) - Separate render pass with LoadOp::LOAD after voxels+topings - New materials: SmoothStone (mat 6), blocky Stone (mat 3) and Dirt patches added to world generation for boundary testing
33 lines
1.1 KiB
HLSL
33 lines
1.1 KiB
HLSL
// BVLE Voxels - Smooth Surface Nets Vertex Shader (Phase 5.1)
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// Vertex pulling from StructuredBuffer<SmoothVertex>.
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// Each vertex is 32 bytes: float3 pos, float3 normal, uint matPacked, uint16 chunkIndex.
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#include "voxelCommon.hlsli"
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struct SmoothVtx {
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float3 position; // world-space position (chunk origin already added)
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float3 normal; // face normal
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uint matPacked; // materialID(8) | secondaryMat(8) | blendWeight(8) | pad(8)
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uint chunkIndex; // packed: chunkIndex in low 16 bits
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};
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StructuredBuffer<SmoothVtx> smoothVertices : register(t6);
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struct VSOutput {
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float4 position : SV_POSITION;
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float3 worldPos : WORLDPOS;
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float3 normal : NORMAL;
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nointerpolation uint matPacked : MATERIALID;
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};
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[RootSignature(VOXEL_ROOTSIG)]
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VSOutput main(uint vertexID : SV_VertexID) {
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SmoothVtx vtx = smoothVertices[vertexID];
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VSOutput output;
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output.position = mul(viewProjection, float4(vtx.position, 1.0));
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output.worldPos = vtx.position;
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output.normal = vtx.normal;
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output.matPacked = vtx.matPacked; // pass all packed material data to PS
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return output;
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}
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