Here is a little scene I've set up for demonstrations.

I have an environment sphere with a city scene mounted in it. I have a dark ground, and a few boxes of various sizes and shades of gray surrounding my subject - a Poser sphere. The sphere has been scaled to 800%.

There is one infinite white light at 80%. I am using Poser Pro 2010 with IDL for global illumination (GI). If you don't have P8 or PPro2010, you'll need to use a second light - an IBL - to fake your GI.

In this initial render, the sphere has a simple white diffuse material, diffuse value = .8, no specular, no reflection.
 

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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)