RigidBodyDefinition missing friction parameter

[calvertdw]

For the simulation of the Door, I need the bolt to be slippery, and the only way to set the friction (I think) is by casting to the physics engine specific classes and setting the friction parameter manually. For example:

BulletPhysicsEngine bulletPhysicsEngine = (BulletPhysicsEngine) simulationSession.getPhysicsEngine();

bulletRobot = bulletPhysicsEngine.getBulletRobots().get(0);

// The bolt should be slippery
BulletMultiBodyLinkCollider boltLinkCollider = bulletRobot.getBulletMultiBodyRobot().getBulletMultiBodyLinkCollider(3);
boltLinkCollider.setFriction(0.001);