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Convert normal texture without specific format

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This commit is contained in:
Masataka SUMI
2021-05-25 17:49:00 +09:00
parent a3def4974f
commit 8e76bc24e0
1 changed files with 15 additions and 10 deletions
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25
Assets/UniGLTF/Runtime/UniGLTF/Resources/Shaders/NormalMapEncoder.shader
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@@ -43,18 +43,23 @@
{
half4 col = tex2D(_MainTex, i.uv);
#if defined(UNITY_NO_DXT5nm)
// This is a trick from UnpackNormal in UnityCG.cginc !!!!
return col;
#endif
half4 packedNormal;
packedNormal.x = col.x;
packedNormal.y = col.y;
packedNormal.z = col.z;
packedNormal.w = 1.0;
half4 normal;
normal.x = 1.0;
normal.y = col.y;
normal.z = 1.0;
normal.w = col.x;
// normalize as normal vector
float3 normal;
normal.xy = packedNormal.xy * 2 - 1;
if (dot(normal.xy, normal.xy) > 1)
{
normal.xy = normalize(normal.xy);
}
normal.z = sqrt(1 - saturate(dot(normal.xy, normal.xy)));
return normal;
packedNormal.xyz = normal.xyz * 0.5 + 0.5;
return packedNormal;
}
ENDCG
}