on opengl achieve 3D cone reduction of a small sample. From this example can be seen as the cone reduction in the rate of increase shows importance.

Packet : 69491750frustum.zip filelist
frustum/AABox.cpp
frustum/AABox.h
frustum/FrustumG.cpp
frustum/FrustumG.h
frustum/frustummain.cpp
frustum/frustummain.dsp
frustum/frustummain.dsw
frustum/Plane.cpp
frustum/Plane.h
frustum/Vec3.cpp
frustum/Vec3.h

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