Italian Chapter Conference 2008
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Browsing Italian Chapter Conference 2008 by Subject "Categories and Subject Descriptors (according to ACM CCS): C.1.4 [Processor Architectures]: Parallel Architectures I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism."
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Item On Estimating the Effectiveness of Temporal and Spatial Coherence in Parallel Ray Tracing(The Eurographics Association, 2008) Cosenza, Biagio; Cordasco, Gennaro; Chiara, Rosario De; Erra, Ugo; Scarano, Vittorio; Vittorio Scarano and Rosario De Chiara and Ugo ErraIn 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.