ahh yes. the problem is that the planes used in the worldbox are really more of a helper feature. you can't set the material properties on them.
the solution is to create your own world bounds, using jit.phys.body, and setting the properties mentioned above.
eg, in the phys.body help patch, there is a cube shape rigid body that is scaled and positioned to be the "floor"
try using 6 static rigid bodies, instead of the worldbox, and your ball should bounce forever.
I'm making a beer pong emulation for Kinect in which the ball and rims of the cups are jit.phys.body objects and I am struggling to get the ball to move naturally. There are two issues. There seems to be a significant amount of air resistance even when damping is 0. and the ball rolls across the tops of the cups rather than bouncing even when restitution is set to 1. for both the cups and the ball. Both objects have mass 1. and the cups have kinematic 1. so that they will not move when struck. I would paste the patch but you need the kinect to use it properly. Any suggestions?