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Hierarchical representations of large data sets, such as binary cluster trees, are a crucial component in many scalable algorithms used in various fields. Two major approaches for building these trees are agglomerative, or bottom-up, clustering and divisive, or top-down, clustering. The agglomerative approach offers some real advantages such as more flexible clustering and often produces higher quality...
This paper introduces a new multipass algorithm for efficiently computing direct illumination in scenes with many lights and complex occlusion. Images are first divided into 8times8 pixel blocks and for each point to be shaded within a block, a probability density function (PDF) is constructed over the lights and sampled to estimate illumination using a small number of shadow rays. Information from...
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