Well, In answer to the BSP tree problem then, I would say the thing to do
would be to generate the surface triangles, and then you would have the
polygons to sort with the normal BSP algorithm.
tim
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Timothy Ritchey tdr20@cus.cam.ac.uk
Jesus College tel: (01)223 576-822
Cambridge fax: (01)223 576-822
CB5 8BL
England