I would like to Surface Plot a few 3D polygons using a scme like in this simple 5-pint cone description: x y z V == 0 0 0 vertex 1 1 1 -1 vertex 2 1 1 1 vertex 3 -1 1 1 vertex 4 -1 1 -1 vertex 6 I have a working .xmcd model (MathCad 14) but its way to complicated. Convinced that some of you seasoned experts have solved this issue I am asking for help as a Newby in MathCad modeling. The application is in Display System analysis of multiple projectors producing a single large image.