Truespace TS 7.6 is free and has a pretty nice Physical engine. you can even writr your own plug
or use the link editor to make procedural animations....
HTH!
Peter
I agree Brian. I purchased TrueSpace 5 years ago. By far, the worst user interface ever designed by man. After 3 months of frustration I placed it on the shelf for good. I wouldn't take it if it was free - time to learn it is not worth wasting. I'm a HyperShot fan now.
I purchased TS 7.5 with Vray...After 2 month I told: Nothanks! :D (I had got a lots import probleme too slow and more). Anyway I thought of TS Thanks your suggestion. I found a multibody dinamic simulation python script based on an italian university. I hope that will be proper.