Rigid Body mass change during simulation

[jamie01]

Is it possible to change the mass of a rigid body without removing it from the world first? Searches have indicated that it is, but I'm getting some really strange behaviour such as floating objects or just no movement at all.

I'm currently doing the following:

Code: Select all

btVector3 inertia;
rigidBody->getCollisionShape()->calculateLocalInertia( newmass, inertia );
rigidBody->setMassProps( newmass, inertia );
rigidBody->updateInertiaTensor();

The body in question is actually used in a btRaycastVehicle, though I don't suppose that should make any difference?

Thanks

[jamie01]

Hmm, it would seem that even removing / re-adding the body before and after that block of code still doesn't help. The effects aren't particularly drastic but the vehicle is pretty much undrivable, even if I then set mass back to the original value

[STTrife]

It's probably important when you do this. Do you use the tick callback (pre or post)?