Using rigid bodies without collision

[Gogo]

Hi,

I'm already using bullet successfully for my application, however I am curious to know if there is a way to add an object to the world purely for the usage of raytests, without incurring any other performance overhead for physics, i.e I would like to be able to use bullet's raytest functionality for a 3d object, but I don't require any other collision/physics for the object. Is setting CF_NO_CONTACT_RESPONSE for the rigid body enough? Or should I be adding a btCollisionObject to the world instead of the btRigidBody..? Or doing something else entirely?

Thanks

[Jacky_J]

You should be able to get away with adding just a btCollisionObject, though i haven't really tried it. For trigger zones in my game, i just use a rigidbody with CF_NO_CONTACT_RESPONSE and CF_STATIC_OBJECT flags set.