Well some people compare it to havok but I can’t since the havok team wont even [Email]cr@p[/Email] on you if you don’t have serious finance behind you. Let’s put it this way I can have 500 – 600 active cubes and still get about 60 fps on my “aged” p4 3ghz in software mode. I can sometimes choke the rendering engine (especially with stencil shadows) before there is much noticeable physics simulation slowdown. Yes I will do some kind of physics playground demo soon.