use btGeneric6DofConstraint to restrict rotation around Y

[leeco]

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.

ConstraintDemo.rar

(2.92 KiB) Downloaded 604 times

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

[arcwf]

Check out this thread: http://bulletphysics.org/Bullet/phpBB3/ ... 494#p19494
--Christopher

[leeco]

Check out this thread: http://bulletphysics.org/Bullet/phpBB3/ ... 494#p19494
--Christopher

It's very useful. Thank you.