Quote - There's a site somewhere (lost the link!) that shows someone using a mirror ball to get photograph an IBL image.

I've used a 100% reflective ball primitive (medium size) in poser, used a filling light and rendered from the front view camera. Crop it square in a graphics app and use as the IBL

That works. If you want a more accurate IBL of your scene, use this:

https://sites.google.com/site/bagginsbill/free-stuff/genibl---ibl-generator

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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)