From: renouar@amertume.ufr-info-p7.ibp.fr (Renouard Olivier) Subject: Re: POV previewer Nntp-Posting-Host: amertume.ufr-info-p7.ibp.fr Organization: Universite PARIS 7 - UFR d'Informatique Lines: 10 Actually I am trying to write something like this but I encounter some problems, amongst them: - drawing a 3d wireframe view of a quadric/quartic requires that you have the explicit equation of the quadric/quartic (x, y, z functions of some parameters). How to convert the implicit equation used by PoV to an explicit one? Is it mathematically always possible? I don't have enough math to find out by myself, has anybody heard about useful books on the subject?