关于切线空间到世界空间的转换：Common.ush文件中：

/** Transforms a vector from tangent space to world space */
MaterialFloat3 TransformTangentVectorToWorld(MaterialFloat3x3 TangentToWorld, MaterialFloat3 InTangentVector)
{
	// Transform directly to world space
	// The vector transform is optimized for this case, only one vector-matrix multiply is needed
	return mul(InTangentVector, TangentToWorld);
}

　　在ShadingModelsMaterial.ush文件中：

#if MATERIAL_TANGENTSPACENORMAL
                float3 tempnormal = normalize(TransformTangentVectorToWorld( MaterialParameters.TangentToWorld, ClearCoatBottomNormal0(MaterialParameters) ));
……
#endif