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menduz/normals.hlsl

Last active May 30, 2020 13:14
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Normal encoding/decoding in float2
Raw
normals.hlsl
//Encoding:
float2 atanYX = atan2(normalIn.y,normalIn.x);
float2 normalOut = float2(atanYX/PI,normalIn.z);
normalOut = (normalOut+1.0)+0.5;
//Decoding:
float2 angles = normalOut*2.0- 1.0;
float2 theta = sincos(angles.x*PI,theta.x,theta.y);
float2 phi = float2(sqrt(1.0- angles.y*angles.y),angles.y);
float3 normal = float3(theta.y*phi.x,theta.x*phi.x,phi.y);
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