Orientation of polygons

I'm trying to make a custom shape generator, and I'm at a frustrating point where it's not giving any errors, and the parameter sliders are showing up, but the shape itself isn't rendering.  Just to confirm:  All of the polygons, as seen from the outside, should have the vertices listed in clockwise order, right?  Are there any other likely reasons why it wouldn't render, or tests I can do to narrow down the problem?

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