I need to animate a tetrahedron

I have Illustrator and intend to make an animated GIF. A tetrahedron is a pyramid with a triangle base. I can't make the 3D extrusion on CS4 agree that I want a pyramid shape. It gave me a triangular prism, though I followed an online tutorial (but that had a square base - which might be part of the problem, and it was for CS3). (No, I don't want to use Flash or download a trial version of Maya but thanks for the thought) So, online free 3D software where I can capture a number of positions of a tetrahedron, and redraw them from within Illustrator? I will need to also place text on each face, so if I can do it in one program only, I'll be happier.
posted by b33j on Feb 8, 2013 - 7 answers