Viewing Volume Visualizer is a tutorial tool for understanding
viewing and projection in OpenGL. It allows user to see effects
of changing viewing and projection parameters on seeing a scene.
Additionally it is possible to dump a C file which specifies viewing
and projection of the current principal view in one routine. It could
be incorporated into another program that wants to define a specific
view and projection. VVV can therefore be used as a preview tool.

WWW:	http://www.inf.ufes.br/~thomas/graphics/vvv/vvv.html