I'm at work right now but when I get home I'll try an experiment.

I have a Nikon D90 SLR and an SB-600 speed flash. The flash unit can be detached from the camera and set up on a stand anywhere I want. I can program the camera's built-in flash in commander mode to fire the detached flash only. I'll try some photographs in a pitch dark room (have to wait for the sun to go down completely) with that setup. I could try in a bathroom but the bounce light from nearby surfaces would spoil the exxperiment. I should be able to get a pretty good approximation to a point light in a larger room where there are no surfaces near the flash or the subject.

As to the subject, I wish I had a simple white ball but I don't. I'll try to find something similar. Maybe I have a can of something that I can use as a cylinder prop and wrap a piece of white paper around it. Then we can compare the light response to a Poser cylinder and see what the terminator looks like.

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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)