Apply matmult transformation to input.

Apply affine transformation, like a vox2ras_tkr transformation, to input. This is just matrix multiplication for different input objects.

Usage

apply.transform(object, matrix_fun)

Arguments

object

numerical vector/matrix or Triangles3D instance, the coorindates or object to transform.

matrix_fun

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.

Value

the input after application of the affine matrix (matrix multiplication)