Here's an example. (Click to enlarge) By adjusting the image offsets and scales, I was able to straighten out the panorama, when viewed on the EnvSphere.

A very unfortunate thing is that Poser preview will not show the scaled image in correct proportions or position. It ignores those parameters altogether in preview. So you have to guess and test render over and over to get it right.

Looking at the material room surface preview, you can see how very much is missing.

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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)