Transforming Texture Coordinates

For a regular 2D texture transform, it's more like

mul (coord.xyw, (float3x3)transformMatrix);

this will correctly take into account that 2D texture transforms use translation in row3, not row4 of the matrix. This will require a special 2D transformation matrix like the fixed pipeline does.

Then again, if you use the full vector and full matrix, as in your code, you don't need to build the transform differently for a 2D coordinate, and you can forget about that need of the fixed pipeline.

Either way should work fine for scaling and rotation, it's just translation of 2D coords that's special.

Thanks. That helped alot.

how do you set up a 3 or 4d tex coordinate in HLSL??

nevermind got it!!