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Unpack normal maps using Z reconstruction. #819

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Unpack normal maps using Z reconstruction. #819

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3 changes: 3 additions & 0 deletions Runtime/Shader/Built-In/glTFIncludes/glTFUnityStandardInput.cginc
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Expand Up @@ -238,6 +238,9 @@ half3 NormalInTangentSpace(float2 texcoords)
// This is a replacement for UnityStandardUtils UnpackScaleNormalRGorAG to use XYZ normals even with DXT5nm enabled
half4 packedNormal = tex2D(normalTexture, texcoords);
half3 normal = packedNormal.xyz * 2 - 1;
// Reconstruct Z from X,Y.
// This makes two-channel normalmaps (BC5 / EAC_RG) work and matches the behavior of Unity's own shaders.
normal.z = sqrt(1.0 - saturate(dot(normal.xy, normal.xy)));
#if (SHADER_TARGET >= 30)
// SM2.0: instruction count limitation
// SM2.0: normal scaler is not supported
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