polygon3d([[0,0,0], [-1,-1,4], [-1,1,4]])+polygon3d([[0,0,0], [-1,1,4], [1,1,4]])+polygon3d([[0,0,0], [1,1,4], [1,-1,4]])+polygon3d([[0,0,0], [1,-1,4], [-1,-1,4]])

Pratap-pg no-196,eg-2 (last edited 2010-12-18 05:32:21 by anil)