Get the first fixture in this contact.
Get the second fixture in this contact.
Enable/disable this contact. This can be used inside the pre-solve contact
listener. The contact is
Get the contact manifold. Do not set the point count to zero. Instead call
Flag this contact for filtering. Filtering will occur the next time step.
Get the next contact in the world's contact list.
initialization for pooling
Has this contact been disabled?
Is this contact touching
Friction mixing law. The idea is to allow either fixture to drive the
restitution to zero. For examp