Abstract
Rays having the same origin and similar directions frequently appear in the form of viewing rays and shadow rays to area light sources in ray tracing, and in hemisphere shooting or gathering in radiosity algorithms. The coherence between these rays can be exploited by enclosing a bundle of these rays with a pyramid and by classifying objects with respect to this pyramid prior to tracing the rays. We present an implementation of this algorithm for a bintree spatial subdivision structure and compare the performance with a recursive bintree traversal and the standard grid traversal algorithm. In parallel implementations the technique can be used to create coherent intersection tasks, allowing demand-driven scheduling with low communication overheads.
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van der Zwaan, M., Reinhard, E., Jansen, F.W. (1995). Pyramid Clipping for Efficient Ray Traversal. In: Hanrahan, P.M., Purgathofer, W. (eds) Rendering Techniques ’95. EGSR 1995. Eurographics. Springer, Vienna. https://doi.org/10.1007/978-3-7091-9430-0_1
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DOI: https://doi.org/10.1007/978-3-7091-9430-0_1
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