80 lines
2.6 KiB
HLSL
80 lines
2.6 KiB
HLSL
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inline float3 voronoi_noise_randomVector (float3 UV, float offset){
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float3x3 m = float3x3(15.27, 47.63, 99.41, 89.98, 95.07, 38.39, 33.83, 51.06, 60.77);
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UV = frac(sin(mul(UV, m)) * 46839.32);
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return float3(sin(UV.y*+offset)*0.5+0.5, cos(UV.x*offset)*0.5+0.5, sin(UV.z*offset)*0.5+0.5);
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}
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void VoronoiPrecise3D_float(float3 UV, float AngleOffset, float CellDensity, out float Out, out float Cells) {
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float3 g = floor(UV * CellDensity);
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float3 f = frac(UV * CellDensity);
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float2 res = float2(8.0, 8.0);
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float3 ml = float3(0,0,0);
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float3 mv = float3(0,0,0);
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for(int y=-1; y<=1; y++){
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for(int x=-1; x<=1; x++){
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for(int z=-1; z<=1; z++){
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float3 lattice = float3(x, y, z);
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float3 offset = voronoi_noise_randomVector(g + lattice, AngleOffset);
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float3 v = lattice + offset - f;
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float d = dot(v, v);
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if(d < res.x){
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res.x = d;
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res.y = offset.x;
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mv = v;
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ml = lattice;
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}
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}
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}
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}
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Cells = res.y;
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res = float2(8.0, 8.0);
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for(int y1=-2; y1<=2; y1++){
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for(int x1=-2; x1<=2; x1++){
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for(int z1=-2; z1<=2; z1++){
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float3 lattice = ml + float3(x1, y1, z1);
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float3 offset = voronoi_noise_randomVector(g + lattice, AngleOffset);
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float3 v = lattice + offset - f;
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float3 cellDifference = abs(ml - lattice);
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if (cellDifference.x + cellDifference.y + cellDifference.z > 0.1){
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float d = dot(0.5*(mv+v), normalize(v-mv));
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res.x = min(res.x, d);
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}
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}
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}
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}
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Out = res.x;
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}
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void Voronoi3D_float(float3 UV, float AngleOffset, float CellDensity, out float Out, out float Cells) {
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float3 g = floor(UV * CellDensity);
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float3 f = frac(UV * CellDensity);
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float3 res = float3(8.0, 8.0, 8.0);
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for(int y=-1; y<=1; y++){
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for(int x=-1; x<=1; x++){
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for(int z=-1; z<=1; z++){
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float3 lattice = float3(x, y, z);
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float3 offset = voronoi_noise_randomVector(g + lattice, AngleOffset);
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float3 v = lattice + offset - f;
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float d = dot(v, v);
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if(d < res.x){
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res.y = res.x;
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res.x = d;
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res.z = offset.x;
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}else if (d < res.y){
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res.y = d;
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}
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}
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}
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}
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Out = res.x;
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Cells = res.z;
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}
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