Friction for this material.
If non-negative, it will be used instead of the friction given by ContactMaterials. If there's no matching ContactMaterial, the value from defaultContactMaterial
in the World will be used.
Material id.
Material name. If options is a string, name will be set to that string.
Restitution for this material.
If non-negative, it will be used instead of the restitution given by ContactMaterials. If there's no matching ContactMaterial, the value from defaultContactMaterial
in the World will be used.
Defines a physics material.