On Estimating the Effectiveness of Temporal and Spatial Coherence in Parallel Ray Tracing
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Date
2008
Journal Title
Journal ISSN
Volume Title
Publisher
The Eurographics Association
Abstract
In this paper we estimate the effectiveness of exploiting coherence in Parallel Ray Tracing. We present a load- balancing technique which divides the original rendering problem in balanced subtasks and distribute them to independent processors through a Prediction Binary Tree (PBT). Furthermore the PBT allows to exploit temporal coherence among successive image frames. At each new frame, it updates the current PBT using a cost function which uses the previous rendering time as cost estimate. We also provide two heuristics which take advantage of data-locality. We assess the effectiveness of the proposed solution by running two experiments. The £rst one aims to investigate the accurancy of predictions made using the PBT. Results show that such predictions are quite accurate even considering a heavily unbalanced scene and a fast moving camera. The second experiment evaluates the two locality-aware heuristics showing a modest improvement.
Description
@inproceedings{10.2312:LocalChapterEvents/ItalChap/ItalianChapConf2008/097-104,
booktitle = {Eurographics Italian Chapter Conference},
editor = {Vittorio Scarano and Rosario De Chiara and Ugo Erra},
title = {{On Estimating the Effectiveness of Temporal and Spatial Coherence in Parallel Ray Tracing}},
author = {Cosenza, Biagio and Cordasco, Gennaro and Chiara, Rosario De and Erra, Ugo and Scarano, Vittorio},
year = {2008},
publisher = {The Eurographics Association},
ISBN = {978-3-905673-68-5},
DOI = {10.2312/LocalChapterEvents/ItalChap/ItalianChapConf2008/097-104}
}