Hi all, I think the description of make_watertight is quite good. I don't have anything to add to it. I did notice on the EBMesh page I was seeing some strange text around hyperlinks that I don't think is expected. Thought I'd let you know. Looks something like this : � MeshKit <http://sigma.mcs.anl.gov/?page_id=777>� Here's the page at which I was seeing it: http://sigma.mcs.anl.gov/?p=795 Cheers, -- Patrick C. Shriwise Research Assistant University of Wisconsin - Madison Engineering Research Building - Rm. 428 1500 Engineering Drive Madison, WI 53706 (608) 446-8173