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Efficient compositing methods for the sort-last-sparse parallel volume rendering system on distributed memory multicomputers

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3 Author(s)
Don-Lin Yang ; Dept. of Inf. Eng., Feng Chia Univ., Taichung, Taiwan ; Jen-Chih Yu ; Yeh-Ching Chung

In the sort-last-sparse parallel volume rendering system on distributed memory multicomputers, as the number of processors increases, in the rendering phase, we can get a good speedup because each processor renders images locally without communicating with other processors. However, in the compositing phase, a processor has to exchange local images with other processors. When the number of processors is over a threshold, the image compositing time becomes a bottleneck. In this paper, we proposed three compositing methods, the binary-swap with bounding rectangle method, the binary-swap with run-length encoding and static load-balancing method, and the binary-swap with bounding rectangle and run-length encoding method, to efficiently reduce the compositing time in the sort-last-sparse parallel volume rendering system on distributed memory multicomputers. The proposed methods were implemented on an SP2 parallel machine along with the binary-swap compositing method. The experimental results show that the binary-swap with bounding rectangle and run-length encoding method has the best performance among the four methods

Published in:

Parallel Processing, 1999. Proceedings. 1999 International Conference on

Date of Conference:

1999