Mass and RBD objects

[jim c]

In playing around with RBD objects, I was fiddling with the Mass setting in the Physical tab of the RBD Object. When I set this manually, using the default units of Kilograms, I would expect an object with a large mass number to not move around very much once they collide with hte ground plane. But even setting it as high as 10,000,000 kilograms/units, and the object still rolls around like a plastic toy. Using the Bullet rbd solver is this normal? For example, if I dropped a spherical like shape, that weight 10,000,000 kg from a few meters up, with a little bit of forward velocity, I would not expect it to bounce when it hits the ground! Is this because you need to set other parameters on the RBD object in tandem with mass for heavy objects?

If this is the case, then is there a cheat sheet with "good" or "realistic" values? For example, is there somewhere to find out what the bounce and Friction would be for a the rubber/material found in tires, so say a 15Kg tire? Or is this all just random trial and error on a case by case basis?

[LouisXIV]

I'm also very interested in this topic. Jim have you found some answers to your questions?

[jim c]

Nope, not so far. I did see some stuff online that suggested that to do this kind of thing effectively, you needed to read up quite a bit on physics and the math related to this stuff.

[gaurav]

Apply some drag in to the system and see it working.

Cheers!

[jim c]

Thanks, I'll look into that.