a demonstration is icosahedron with the ball (OR) Portfolio (AND) Combination (SUB) combination of engineering , compile, run need glut

csg
...\csg.cpp
...\csg.dsp
...\csg.dsw
...\csg.exe
...\csg.ncb
...\csg.opt
...\csg.plg
...\Makefile.sgi
...\Makefile.win
...\trackball.cpp
...\trackball.h

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