Simple capping demonstration
This program renders capped and intersected objects. It uses stencil
and user-defined clipping planes to compute and light the internal
surfaces (where they are exposed by a clipping plane) and to highlight
intersections of solids. All in Just 1200 lines of code!
When a polygonal surface representation of a solid object is
clipped, the inside of the "solid" is revealed. This
program demonstrates a technique to "cap" the solid, so that
it appears solid even when clipped. In order to do this, it
draws each object twice, once to render the visible surfaces,
and again counting the number of accesses at each pixel.
Finally, the clipping planes themselves are drawn, with pixels
actually modified only where the pixel access count in the
stencil buffer is odd (i.e. where the inside of a solid was
revealed).
type "make demo" to run the program
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