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.