High-Performance Graphics 2010
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Browsing High-Performance Graphics 2010 by Subject "Categories and Subject Descriptors (according to ACM CCS): I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism Raytracing"
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Item HLBVH: Hierarchical LBVH Construction for Real-Time Ray Tracing of Dynamic Geometry(The Eurographics Association, 2010) Pantaleoni, Jacopo; Luebke, David; Michael Doggett and Samuli Laine and Warren HuntWe present HLBVH and SAH-optimized HLBVH, two high performance BVH construction algorithms targeting real-time ray tracing of dynamic geometry. HLBVH provides a novel hierarchical formulation of the LBVH algorithm [LGS-09] and SAH-optimized HLBVH uses a new combination of HLBVH and the greedy surface area heuristic algorithm. These algorithms minimize work and memory bandwidth usage by extracting and exploiting coarse-grained spatial coherence already available in the input meshes. As such, they are well-suited for sorting dynamic geometry, in which the mesh to be sorted at a given time step can be defined as a transformation of a mesh that has been already sorted at the previous time step. Our algorithms always perform full resorting, unlike previous approaches based on refitting. As a result they remain efficient even during chaotic and discontinuous transformations, such as fracture or explosion.