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+OpenCSG is a library that does image-based Constructive Solid Geometry
+rendering using OpenGL.
+
+To run OpenCSG well, you should have graphics hardware with a good fill
+rate. NVidia GeForce and ATI Radeon qualify. The OpenCSG::OcclusionQuery
+option requires occlusion queries, which are available since Radeon 9x00
+(x>=5) and GeForce3 (but not GeForce4MX).