Yes. That is correct.

To be more specific, the actual numerical values don't matter. It is the relative positions that must all be in agreement.

In all cases, the camera should be at the center of the sphere or close to it.

The camera and sphere center can be 10,000 meters above ground 0, as long as you have the objects 100 meters below the camera at 9900 meters, it will all look the same as if the camera and sphere are at 0 and the objects are at -100.

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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)