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Fix handedness mismatch with generated tangents #123

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Fix handedness mismatch with generated tangents #123

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5 changes: 4 additions & 1 deletion shared/gltf/GltfHelper.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -55,7 +55,10 @@ namespace
primitive->Vertices[vertexIndex].Tangent.x = fvTangent[0];
primitive->Vertices[vertexIndex].Tangent.y = fvTangent[1];
primitive->Vertices[vertexIndex].Tangent.z = fvTangent[2];
primitive->Vertices[vertexIndex].Tangent.w = fSign;
// handedness difference, see:
// https://github.com/KhronosGroup/glTF-Sample-Models/issues/174
// https://github.com/KhronosGroup/glTF/issues/2056
primitive->Vertices[vertexIndex].Tangent.w = -fSign;
};

// Run the MikkTSpace algorithm.
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