Optional frictionOptional frictionRelaxation of the resulting friction force.
Optional frictionStiffness of the resulting friction force.
Optional relaxationRelaxation of the resulting ContactEquation that this ContactMaterial will generate.
Optional restitutionRestitution, or "bounciness" to use in the contact of these two materials.
Optional stiffnessHardness of the contact.
Optional surfaceWill add surface velocity to this material.
Friction coefficient to use in the contact of these two materials.