in order to check if the given FEdge is perpendicular to the near/far clipping plane of the viewing frustrum. Also added a direct solver of the 2D-to-3D inverse projection transformation problem (currently disabled by #if 0).
in order to check if the given FEdge is perpendicular to the near/far clipping plane of the viewing frustrum. Also added a direct solver of the 2D-to-3D inverse projection transformation problem (currently disabled by #if 0).