15 lines
375 B
GLSL
15 lines
375 B
GLSL
//Spheremap Transform from https://aras-p.info/texts/CompactNormalStorage.html
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vec2 EncodeNormal(vec3 n) {
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float f = sqrt(n.z * 8.0 + 8.0);
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return n.xy / f + 0.5;
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}
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vec3 DecodeNormal(vec2 enc) {
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vec2 fenc = enc * 4.0 - 2.0;
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float f = dot(fenc,fenc);
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float g = sqrt(1.0 - f / 4.0);
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vec3 n;
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n.xy = fenc * g;
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n.z = 1.0 - f / 2.0;
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return n;
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} |