One more demonstration. Here I'm showing how the transparency parameter is properly used to implement "no glass here". I used a tile node to create four circular holes. I plugged that into the Transparency, as well as the amount of reflection, refraction, and specular reflection. This is the proper setup to use a mask on a transparent surface.

Notice that Poser has now correctly implemented not just the glass, but the partial shadow of the sunlight passing through the glass. Where light goes through the holes, the cylinder is fully lit. Where light has to pass through the glass, some of it is lost, so the cylinder is partially in shade.

I've seen lots of posts saying you should not use refraction and transparency at the same time. This is bogus - it works perfectly. You just need to know what each one is for.

Pretty cool huh?

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)