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3d polygon to 2d polygon

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hi all, how do i convert a 3d polygon with vertices having x,y & z to a 2d polygon. I need to do this so that I could apply 2d triangulation algorithms on that to tesselate the polygons into triangles. forgot the math behind it. so, help me out. ~ Matt

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What you're looking for is called projection. There are many different kinds of projection, but the most common is perspective projection, where things get smaller the farther away they are (like in real life). This page describes it in a bit more detail and has some formulas you can use.

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