Thanks to Chris Johnson for providing the open collaborative research environment that allowed this work to happen. Thanks to Elaine Cohen for many conversations on spline surface intersection and to Amy Gooch for help with model acquisition and conversion. Thanks to Dave Beazley and Peter Lomdahl at Los Alamos National Laboratory for the 35 million sphere data set. Special thanks to Jamie Painter and the Advanced Computing Laboratory at Los Alamos National Laboratory for access to a 128 processor machine for final benchmarks. The bunny model appeared courtesy of the Stanford University Graphics Laboratory. This work was supported by the SGI Visual Supercomputing Center, the Utah State Centers of Excellence, the Department of Energy and the National Science Foundation.