image-based CSG library using OpenGL (example program)

 OpenCSG is a library for CGS (Constructive Solid Geometry) that can combine
 geometric primitives to more complex objects, for example the difference
 between two primitives. Instead of explicitly calculating the shape of the
 resulting object, it uses OpenGL's z-buffer to render the image.
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 OpenCSG implements both the Goldfeather and the SCS algorithm.
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 This package contains a OpenCSG demo program.