apply.transform: Apply matmult transformation to input.
In fsbrain: Managing and Visualizing Brain Surface Data

apply.transform

R Documentation

Apply matmult transformation to input.

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

apply.transform(object, matrix_fun)

`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.