This is my implementation Warnock algorithm. Warnock algorithm is a hidden surface algorithm used in computer graphics.
It solves the problem of rendering a complicated image by recursive subdivision of a scene until areas are obtained that are trivial to compute.
Complex: O(n*p), where n is the number of polygons and p is the number of pixels in the viewport
For more information: http://www.cs.sun.ac.za/~lvzijl/courses/rw778/grafika/OpenGLtuts/Big/graphicsnotes009.html
File "stesh_fortest.dxf" is sample.