Physics Simulation Forum

Hello everyone. I created three btGeneric6DofConstraint to restrict three Rigidbody rotation, code as below

{ //Allowed rotation around the x-axis only
trans.setOrigin(btVector3(-10,0,0));
d6body0 = localCreateRigidBody( mass,trans,shape);
d6body0->setActivationState(DISABLE_DEACTIVATION);

spSlider6Dof = new btGeneric6DofConstraint(*d6body0,btTransform::getIdentity(),true);
spSlider6Dof->setAngularLowerLimit(btVector3(1.0, 0, 0));
spSlider6Dof->setAngularUpperLimit(btVector3(-1.0,0, 0));

m_dynamicsWorld->addConstraint(spSlider6Dof);
spSlider6Dof->setDbgDrawSize(btScalar(5.f));
}
{ //Allowed rotation around the y-axis only
trans.setOrigin(btVector3(0,0,0));
d6body0 = localCreateRigidBody( mass,trans,shape);
d6body0->setActivationState(DISABLE_DEACTIVATION);

spSlider6Dof = new btGeneric6DofConstraint(*d6body0,btTransform::getIdentity(),true);
spSlider6Dof->setAngularLowerLimit(btVector3(0,1.0,0));
spSlider6Dof->setAngularUpperLimit(btVector3(0,-1.0,0));

m_dynamicsWorld->addConstraint(spSlider6Dof);
spSlider6Dof->setDbgDrawSize(btScalar(5.f));
}
{ //Allowed rotation around the z-axis only
trans.setOrigin(btVector3(10,0,0));
d6body0 = localCreateRigidBody( mass,trans,shape);
d6body0->setActivationState(DISABLE_DEACTIVATION);

spSlider6Dof = new btGeneric6DofConstraint(*d6body0,btTransform::getIdentity(),true);
spSlider6Dof->setAngularLowerLimit(btVector3(0, 0, 1.0));
spSlider6Dof->setAngularUpperLimit(btVector3(0, 0,-1.0));

m_dynamicsWorld->addConstraint(spSlider6Dof);
spSlider6Dof->setDbgDrawSize(btScalar(5.f));
}

But you can see the second constraint is weird. Why?

You can use the file in attachment instead of the same file in AppConstraintDemo to see it.


I want to create a car which can not turn over, How can I implement it?

Check out this thread: http://bulletphysics.org/Bullet/phpBB3/viewtopic.php?p=19494#p19494
--Christopher

It's very useful. Thank you.