-spec rotate3d(Width :: non_neg_integer(),
               Height :: non_neg_integer(),
               Roll :: number(),
               Tilt :: number(),
               Pan :: number()) ->
                  {ok, string()} | {error, term()}.

Calculate the transformation matrix for the perspective. Translate the corner points of the image to the arguments for the ImageMagick distort function. This code has been derived from http://www.fmwconcepts.com/imagemagick/3Drotate/index.php

Here we don't scale the image, the image is rotated from the center of the image, and we use a fixed viewing point that is compatible with the viewing point used in the mod_image_edit css3 transformations.