Collision objects without rotation

Hi,

I want to have a collision object but I don't want that the collisions affect the autorotation of the object. Do you know if is it possible?

Thank you very much!

With bullet:

Code:

object->_SIO2objectphysic->_btRigidBody->setAngularFactor(btVector3(0,0,1));

So, the rotation is fixed to axis Z

You can set constraints with Bullet. I dont recall the exact functions thought but if you check the Bullet docs you will find the object constraints in there.

I tried your example angular factor (with floats 0.0, 0.0, 1.0 ) but my physic object was unconstrained on all axes. Mystery ...