I have been trying to use image_map to get a 3D object from a cross
section within a gif. The effect of what I am after would be similar to a
complex prism. I set the ouside of the object to have filter 1.0 to make
it transparent and the remainder to have default filter i.e. solid.

According to the image_map documentation "With image maps you should imagine
that each pixel is a long, thin, square, colored rod that extends parallel
to the z-axis. The image is made from rows and columns of these rods
bundled together and the object is then carved from the bundle."

When using map_type 0 with a box I get the image on the front face of the
box,
and the reflection on the rear face and the interior of the box is empty.
The front and rear faces generate separate shadows. This is not what is
implied in the documentation.

a) Is the documentation or my interpretation wrong?
b) Is there another way of getting a prism like 3D object from an image?

Ian

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