I imagine other 3D rendering software such as Cinema4D and Imagine would be able to do nearly the same,
I don't remember any rendering programs for Amiga that did any sort of physics, built in. Not even Lightwave. Are you saying that the programming language for Real3D allows people to program their own physics effects or are there some already built in?
I've programmed particle simulators. The hardest part is collision detection. I remember reading about techniques developed even back in the 70's where the key to three-dimensional collision detection was not to have any concave objects. Anyhoo, Real3D has that kind of functionality?