Hum.....

BB really interesting....

I hope this may solve the trouble about a series of picture (different angles, landscape or close portrait) in open space, like over a boat in ocean.
I still have the trouble with missing sky reflect over water using your sphere
for indirect light

Well yes, somewhat. You still can't zoom in even on an 8K image, but as you can see for wide shots it works great. Some sIBL come with high-res background plates - rectangular, high-res photos to set up just behind your subjects so you do NOT see the spheres. If this initial version is popular, I may consider doing the extra work to support background plates.

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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)