filename : Ada05.pdf entry : appeared conference : Eurographics 2005, Dublin, Ireland, August 29 - September 3, 2005 pages : 8 year : 2005 month : August title : Efficient Raytracing of Deforming Point-Sampled Surfaces subtitle : author : Bart Adams, Richard Keiser, Mark Pauly, Leonidas J. Guibas, Markus Gross, Philip Dutré booktitle : Computer Graphics Forum ISSN/ISBN : 0167-7055 editor : Marc Alexa, Joe Marks publisher : Blackwell Publishing publ.place : volume : 24 issue : 3 pages : 677-684 language : English keywords : point-based surfaces, raytracing, rendering, animation, deformable surfaces abstract : We present efficient data structures and caching schemes to accelerate ray-surface intersections for deforming point-sampled surfaces. By exploiting spatial and temporal coherence of the deformation during the animation, we are able to improve rendering performance by a factor of two to three compared to existing techniques. Starting from a tight bounding sphere hierarchy for the undeformed object, we use a lazy updating scheme to adapt the hierarchy to the deformed surface in each animation step. In addition, we achieve a significant speedup for ray-surface intersections by caching per-ray intersection points. We also present a technique for rendering sharp edges and corners in point-sampled models by introducing a novel surface clipping algorithm.