Multi Bounding Volume Hierarchies for Ray Tracing Pipelines
2016, Viitanen, T., Koskela, M., Jääskeläinen, P. and Takala, J., ACM SIGGRAPH Asia Technical Briefs.
Abstract: High-performance ray tracing on CPU is now largely based on Multi Bounding Volume Hierarchy (MBVH) trees. We apply MBVH to a fixed-function ray tracing accelerator architecture. According to cycle-level simulations and power analysis, MBVH reduces energy per frame by an average of 24% and improves performance per area by 19% in scenes with incoherent rays, due to its compact memory layout which reduces DRAM traffic. With primary rays, energy efficiency improves by 15% and performance per area by 20%.