Well, my guess is based on experimentation with what Ronstuff uncovered regarding the shadow and refractive properties of poser when used with firefly -- which, although I love it to death, was sorta tacked on. Poser uses a scale roughly 1/100th of most other programs -- inclusive of the one that firefly's rendering engine was based on. That makes the numbers pretty damn small. I think the issue is a sort of "ghost" shadowing from too small a calculation.

thou and I, my friend, can, in the most flunkey world, make, each of us, one non-flunkey, one hero, if we like: that will be two heroes to begin with. (Carlyle)