The same way you'd port it to SNES-- software rendered polys using raw CPU power. Polygon games existed before hardware rendering did, after all. Stellar 7 on Apple and later PC is a great example.
I'm uncertain if the 32X actually did have straight polygon rendering support, or if it had to be done through custom engine code, but either way there were a number of polygonal games on the 32X-- including Star Wars Arcade and Virtua Fighter.
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Try checking the MAME manual at http://docs.mamedev.org
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