| i | Index of the contact point. |
| bounciness | Bounciness value for the specified contact point. |
Set the restitution value for the specified contact point in this contact pair.
Restitution value specifies how bouncy the surfaces at the specified contact point are.
Bounciness of 0 means absolutely not bouncy at all (all the kinetic energy is lost at contact). A value of 1 means all the kinetic energy (and then some due to computational errors) will be conserved. Because of that, normally, bounciness is somewhere in between 0 and 1.