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I have made a couple of models in xsi. It took me a while to work out how to get it all going, but I finally got it right. But then the physbox wouldn't work. The physbox for one model was just an 8 sided cylinder, but there is no .phy model in the model folder and the model isn't solid.
Here is the qc command for the physbox:
$collisionmodel "bin_phys.smd" { $Mass 5.0 }