Rigid Body mass change during simulation

jamie01 · **Joined:** Tue Jan 31, 2012 12:23 am **Posts:** 3

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:

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 · **Joined:** Tue Jan 31, 2012 12:23 am **Posts:** 3

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 · **Joined:** Tue May 01, 2012 10:42 am **Posts:** 40

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

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Rigid Body mass change during simulation

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