Hello, I'm at the same time learning vtk and getting ready to buy a laptop to be my general purpose machine. I'm leaning toward a Macintosh Powerbook since I like Macs, but I want to make sure that OSX is at least a reasonable platform for running vtk applications. Would anyone care to comment? If it is at least a workable platform, then I'd be interested in trying to integrate some Altivec and Quartz Extreme optimizations into the port. Since my company is closing its Santa Fe office, I seem to have found myself temporarily free of a job after this week, with some time on my hands :-) ---- Gary Schiltz gss@cybermesa.com Pecos, New Mexico