Parallel progressive rendering of animation sequences at interactive rates on distributed-memory machines
Amit Reisman, Craig Gotsman, Assaf Schuster · 1997
We describe a dynamic load-balancing algorithm for ray-tracing by progressive refinement on a distributed-memory parallel computer.Parallelization of progressive ray-tracing for single images is difficult becauseof the inherent sequentialnature of the samplelocation generation process, which is optimized (and different) for any given image.Parallelization of progressive ray-tracing when generating image sequmcis at a fixed interactive rate is even more difficult, because of the time and synchronization constraints imposed on the system.We show how to overcome these problems, which, to the best of our knowledge, have not been treated before.Exploiting the temporal coherence between frames enables us to both accelerate rendering and improve the load-balance through-' out the sequence.Our dynamic load-balance algorithm, a blend of, local and global methods, accounting not only for rendering per:: formance, but also communication overheads and synchronization issues, is shown to be robust to the harsh environment imposed by a time-critical application, such as the one we consider..