Sam, what do you mean by curvature. In the image I posted with the airplane, in what way does that look like a 1500 foot sphere? It looks like miles and miles of sky and sea.

I totally don't understand what you're referring to by apparent curvature. It's not apparent to anybody what size that sphere is.

Let me put this to you another way. Suppose I render that same image but with the sphere scaled to 50 feet, and also to 5000 feet. What is your prediction about how those images would differ?

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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)