From leboeuf@CERCA.UMontreal.CA Tue Aug 25 17:22:34 1998 Hi ! I'm not sure exactly what kind of cavity you're talking about, but if it is defined through a polygonal surface, the marching cube algorithm will give you both surface and volume. The original article is Lorensen & Cline, Comp. Graph., vol.21, no. 4, '87, p163 bye, Martin. ------------------------------------------------------------------------------- Dr. Ronald M. A. Knegtel Research Scientist Dept. of Molecular Design and Informatics Phone : +31-412-661469 N.V. Organon, RK2340 Fax : +31-412-662539 P.O. Box 20 5340 BH Oss http://www.organon.com/ The Netherlands E-Mail : r.knegtel@organon.oss.akzonobel.nl -------------------------------------------------------------------------------