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matrixdirect3dhlsl

Accessing members of a matrix in HLSL

I am a bit new to using Direct3D and HLSL and I was wondering about the following: How would one access a member of a matrix in one of the shader functions. It seems to me that it should be the dot operator and some stuff after that just as with the vectors. However, I am not exactly sure what I would put down after the dot if I were to use it. Would it be something like .m12 to access the member of the 2nd row and 3rd column?

Solution

  • Assuming you matrix is 

    float4x4 myTransform;

    You can access members 1-based (eg m11 to m44) like :

    float member = myTransform._11;
float member = myTransform._44;

    or zero based as:

    float member = myTransform._m00;
float member = myTransform._m33;