Rigid to Rigid 3D (RTR3D) contact represents contact forces at the contact points between two rigid bodies. RTR3D Contact supports spring, damping and friction forces. Contact surfaces of a Faceset on two contacted bodies must be specified to create the contact. RTR3D Contact calculates its force based on the penetration and relative velocities between action surface and base surface. The action force is applied to the action contact point and an equal and opposite reaction force is applied at the same position on the base body. RTR3D Contact is only available for contact between rigid bodies. RTR3D Contact cannot be selected and created from the Contact ribbon menu, and can only be selected through the properties of Auto Contact, M by N Contact and N Combination Contact.