public void setRestitution(float restitution) {
        constructionInfo.restitution = restitution;
        rBody.setRestitution(restitution);
    }
The "bounciness" of the PhysicsRigidBody. Best performance with restitution=0.

@param restitution the desired value (default=0)
jme3-jbullet/src/main/java/com/jme3/bullet/objects/PhysicsRigidBody.java