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I then sliced the shape by a plane and computed the intersections of the plane and the triangle faces. Each triangle face that intersects the plane, will have two intersection points on two of it's edges thus giving me a line segment that would be apart of the 2D polygon I'm hoping to get out of slicing.

There are a few problems though. For one thing the Line Segments are not ordered. Also, because of some rounding errors, two adjacent line segments might not share the EXACT same point so there has to be some kind of tolerance. Finally the biggest problem I'm facing is that the polygon might be disjointed i.e. the 3D object is not convex, so the polygon slice might be made up of several different polygons.

From a programming perspective, anyone know a fast method to do this and how to deal with the multiple polygons?