79 lines
2.2 KiB
Text
79 lines
2.2 KiB
Text
#pragma kernel CSMain
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StructuredBuffer<float3> verts;
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StructuredBuffer<uint3> indices;
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StructuredBuffer<float2> uvs;
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AppendStructuredBuffer<uint3> newIndices;
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Texture2D alphaTex;
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float cubeSize;
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uint triCount;
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//float3 localCamPos;
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float3 trinormal(float3 v0, float3 v1, float3 v2)
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{
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float3 p = v0-v1;
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float3 q = v1-v2;
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float3 norm = cross(p,q);
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return normalize(norm);
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}
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[numthreads(256,1,1)]
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void CSMain (uint3 id : SV_DispatchThreadID)
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{
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if (id.x >= triCount) return;
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uint3 ind = indices[id.x];
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float3 a = verts[ind.x];
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float3 b = verts[ind.y];
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float3 c = verts[ind.z];
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float ab = distance(a,b);
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float bc = distance(b,c);
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float ca = distance(c,a);
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//if (max(max(ab, bc), ca) > 0.9) return;
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float3 n = trinormal(a,b,c);
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float3 dir = normalize(a);// - localCamPos);
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//if (dot(-dir, n) > 0.2f)
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float elimit = 10;
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float dlimit = 900;
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//if (distance(localCamPos, a) < dlimit && distance(localCamPos, b) < dlimit && distance(localCamPos, c) < dlimit)
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if (length(a) < dlimit && length(b) < dlimit && length(c) < dlimit)
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{
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if (dot(-dir, n) > 0.0f)
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{
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float degenerateThreshold = 0.1f;
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bool deg = false;
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if (((bc + ca) - ab) / ab < degenerateThreshold)
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{
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deg = true;
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}
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else if (((ab + ca) - bc) / bc < degenerateThreshold)
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{
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deg = true;
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}
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else if (((ab + bc) - ca) / ca < degenerateThreshold)
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{
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deg = true;
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}
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if (!deg)
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{
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float2 uv0 = uvs[ind.x] * cubeSize;
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float2 uv1 = uvs[ind.y] * cubeSize;
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float2 uv2 = uvs[ind.z] * cubeSize;
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float a0 = alphaTex.Load(int3(uv0.x, uv0.y, 0)).a;
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float a1 = alphaTex.Load(int3(uv1.x, uv1.y, 0)).a;
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float a2 = alphaTex.Load(int3(uv2.x, uv2.y, 0)).a;
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//float a = a0 + a1 + a2;
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float a = a0 * a1 * a2;
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if (a > 1.0f / 255)
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{
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newIndices.Append(ind);
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}
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}
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}
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}
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}
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