collide and category bits

Is anyone using category and collide bits? They don’t seem to have any effect… The ODE guide is a little opaque as to whether the bits are used directly by ODE or whether they needs to be tested in a nearCallback method.

I can remember discussions about category bits but I’m not sure if anyone has actually used them with Odejava. This would be a nice feature to have. I’m afraid I don’t know much about how they are implemented.

Will.