Just a note, that while DX is a damn nifty program and akin to what some of the NCGR folks were trying to do a while back, it is a complex beast with many quirks. Be sure to read the opendx-users list and pay attention to what people like Greg Abrams and Chris Pelkie have to say... they know what they're doing. Also worth a look is the VTK package, http://www.kitware.com/vtk.html -- it is a set of C++ classes rather than an integrated app like DX, but sometimes that's even better. And sometimes it's not... One thing that DX has which VTK doesn't is a lot of Motif dependencies for the VPE. But perhaps Java Explorer is the answer to that problem. In any event, the DX people are way cool and their code is at least comprehensible (like the VTK code, but unlike some code I've seen) so I'm sure you'll find a lot of ways to leverage their work. Best of luck. I really wish I had enough time to work on cool stuff like this nowadays. Money is nice but I miss the challenge of nasty projects like yours. Got to go back to school one of these days. -- "This is a job for BOB VIOLENCE and SCUM, the INCREDIBLY STUPID MUTANT DOG." -- Bob Violence