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https://github.com/maxartz15/SceneDebugViewer.git
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37 lines
1.1 KiB
HLSL
37 lines
1.1 KiB
HLSL
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#ifndef RS_UTILS_CG_INCLUDED
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#define RS_UTILS_CG_INCLUDED
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// https://www.ronja-tutorials.com/post/010-triplanar-mapping/
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fixed4 SampleTriPlanar(sampler2D tex, float4 tex_ST, float3 position, float3 normal, float sharpness)
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{
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//calculate UV coordinates for three projections
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float2 uv_front = TRANSFORM_TEX(position.xy, tex);
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float2 uv_side = TRANSFORM_TEX(position.zy, tex);
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float2 uv_top = TRANSFORM_TEX(position.xz, tex);
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//read texture at uv position of the three projections
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fixed4 col_front = tex2D(tex, uv_front);
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fixed4 col_side = tex2D(tex, uv_side);
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fixed4 col_top = tex2D(tex, uv_top);
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//generate weights from world normals
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float3 weights = normal;
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//show texture on both sides of the object (positive and negative)
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weights = abs(weights);
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//make the transition sharper
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weights = pow(weights, sharpness);
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//make it so the sum of all components is 1
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weights = weights / (weights.x + weights.y + weights.z);
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//combine weights with projected colors
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col_front *= weights.z;
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col_side *= weights.x;
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col_top *= weights.y;
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//combine the projected colors
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fixed4 col = col_front + col_side + col_top;
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return col;
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}
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#endif
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