clipka <ano### [at] anonymousorg> wrote:
> Isn't such a transformation non-affine? So it wouldn't be possible to do 
> it with a simple 4x4 matrix multiplication.

  Multiplication with a 4x4 matrix can be used for perspective projection.
It's a 3x3 transformation matrix which is restricted to affine transformations.

  (Yes, I didn't know that either, many years ago.)

-- 
                                                          - Warp

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