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A shaded torus produced as part of a 4th year undergraduate project.

The plane faces of the torus ("doughnut") were read into the machine as a set
of (x,y,z) coordinates and the student program enables the torus to be rotated
to show it from any angle.  Note that the image shows how the grey torus would
look if illuminated from a point behind the observer and to the right.
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