26 lines
667 B
HLSL
26 lines
667 B
HLSL
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#ifndef TREE_BILLBOARD_COMMON_URP
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#define TREE_BILLBOARD_COMMON_URP
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float4 _ImageTexcoords[256];
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int _ImageCount;
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void GetImageTexcoord_float(float2 UV0, float3 WorldNormal, out float2 BillboardUV)
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{
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float dotZ = dot(WorldNormal, float3(0, 0, 1));
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float dotX = dot(WorldNormal, float3(1, 0, 0));
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float rad = atan2(dotZ, dotX);
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rad = (rad + TWO_PI) % TWO_PI;
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float f = rad / TWO_PI;
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int imageIndex = f * _ImageCount;
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float4 rect = _ImageTexcoords[imageIndex];
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float2 min = rect.xy;
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float2 max = rect.xy + rect.zw;
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float2 result = float2(
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lerp(min.x, max.x, UV0.x),
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lerp(min.y, max.y, UV0.y));
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BillboardUV = result;
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}
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#endif
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