The implementation is that I load two of my Environment Spheres. The inner one is invisible to raytracing but we see this in the camera. This is the "background" sphere.

Outside that is another sphere, loaded with the HDR image for lighting and reflections. They are locked together, along with the sun, so that all three rotate in sync.

I thought about making it one figure with two actors. But I'm not sure how to do that - I've only made props, not figures. However it's done, it's important that the inner sphere is invisible to raytracing, while the outer is visible to raytracing. I presume this requires two separate actors, i.e not a single prop. If anybody can teach me otherwise, that would be cool.

Note: You can do all this manually, right now, with my free environment sphere (loaded twice). But it's a lot of clicking.

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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)