There are emulators, AS. For Mac it's called Virtual PC, and I don't know what the leading one is for Windows. The problem with these is that they're slooooooow. And as a Mac user, I am thrilled to see 3D stuff on the Mac. You Winders fellers get everything. Anyway, here's a silly little thing I did with Groboto. It's a default "bot" which is basically a default Multi-Replicate setting. The cool thing is that when you make the model, it's all multi-repped spheres. When you export, you can have it merge the spheres, which is what I did with this. It's just a test, and those are just default Bryce materials, but I think this Groboto has some potential!