
char StlTriTriCross(stl_facet T0, stl_facet T1);
char StlSegTriInt( stl_facet T, stl_vertex q, stl_vertex r);
char StlSegPlaneInt(stl_plane P, stl_vertex q, stl_vertex r, stl_vertex *p, int *m );
char StlTriPlaneCross(stl_facet T, stl_plane P, int *v);

