Now I change the opacity to .8. The apparent opacity in the center isn't changed much, but near the edges, the effect is clearly different - softer, more like how nylon looks.

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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)