its one of the tabs up top of 3ds max. its what i used to do that falling block video... so i didnt have to animate each block individually.
its awesome like you can make it so a ball will fall into the water and the water will ripple because of it. and you can make things act as if gravity existed. its hard to explain but is very useful lol
haha nah i dont.. ah well. have you had a look at it yet? pretty soon im gonna make a mass marble run doing it haha. like spirals and stuff and get a ball to roll down. ill try and make it go for like 2 minutes