Out-of-core rendering of large, unstructured grids

We address the problem of rendering large, unstructured volumetric grids and present a set of techniques that render arbitrarily large data sets on machines with limited memory. We present two techniques that vary in rendering speed, disk and memory usage, ease of implementation, and preprocessing costs. The first is a memory-insensitive rendering (MIR) technique that is completely disk-based and requires a small amount of constant main memory. The second technique is based on our ZSweep algorithm. It is more involved in its preprocessing, implementation, and main-memory requirements but can be substantially faster.