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Can I ask a couple of dumb questions, bagginsbill ?

... that is, if you want to load up an EnvSphere, and then load up the IBL Gen tool, what sort of lights should you have loaded up at the beginning before you load up the EnvSphere ?

.... then, once you have created your IBL probe, should you re-load the original light set as well as creating the new IBL light ?

Lights don't matter to the EnvSphere. The EnvSphere is not reacting to light. If you point a flashlight at the sky does it light the sky? Nope.

If you're outdoors and have buildings and such, light them with an infinite and maybe some very mild even white IBL. Record them, load your probe into a light. Record a probe again. If it is very different the second time, load it again, and repeat.

Outdoor scenes should have one main infinite light for the sun. For sunny days, make it really bright - like 90%. For overcast days, reduce 40 to 60 %? I've not experimented with all cases yet.

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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)