Apply affine transformation, like a *vox2ras_tkr* transformation, to input. This is just matrix multiplication for different input objects.
numerical vector/matrix or Triangles3D instance, the coorindates or object to transform.
a 4x4 affine matrix or a function returning such a matrix. If 'NULL', the input is returned as-is. In many cases you way want to use a matrix computed from the header of a volume file, e.g., the 'vox2ras' matrix of the respective volume. See the 'mghheader.*' functions in the *freesurferformats* package to obtain these matrices.
the input after application of the affine matrix (matrix multiplication)
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