Hints for CS543 Project 6

It is useful to put in controls for translating (along normal) and rotating
(about origin) for the plane of projection.  This way you can move the plane
and see your polygon (or object) slowly vanish.  If you do an object, realize
that unless you model each polygon with both a forward and reverse normal (i.e.,
twice as many polygons), the inside of the object exposed after clipping will
not be seen, as it should have been culled by back face removal.