public CompositePhysicsObject(World world, PhysicsObject physObA, PhysicsObject physObB, Vector2 relativeJointPosition)
{
this.physObA = physObA;
this.physObB = physObB;
revJoint = JointFactory.CreateRevoluteJoint(world, physObA.fixture.Body, physObB.fixture.Body, ConvertUnits.ToSimUnits(relativeJointPosition));
physObA.fixture.IgnoreCollisionWith(physObB.fixture);
physObB.fixture.IgnoreCollisionWith(physObA.fixture);
}