Print Email Facebook Twitter Visibility sweeps for joint-hierarchical importance sampling of direct lighting for stochastic volume rendering Title Visibility sweeps for joint-hierarchical importance sampling of direct lighting for stochastic volume rendering Author Kroes, T. Eisemann, M. Eisemann, E. Faculty Electrical Engineering, Mathematics and Computer Science Department Intelligent Systems Date 2015-12-31 Abstract Physically-based light transport in heterogeneous volumetric data is computationally expensive because the rendering integral (particularly visibility) has to be stochastically solved. We present a visibility estimation method in concert with an importance-sampling technique for efficient and unbiased stochastic volume rendering. Our solution relies on a joint strategy, which involves the environmental illumination and visibility inside of the volume. A major contribution of our method is a fast sweeping-plane algorithm to progressively estimate partial occlusions at discrete locations, where we store the result using an octahedral representation. We then rely on a quadtree-based hierarchy to perform a joint importance sampling. Our technique is unbiased, requires little precomputation, is highly parallelizable, and is applicable to a various volume data sets, dynamic transfer functions, and changing environmental lighting. To reference this document use: http://resolver.tudelft.nl/uuid:67e72f05-8c31-448b-95d1-bbce9cee4264 Publisher ACM ISBN 978-0-9947868-0-7 Source GI '15; Proceedings of the 41st Graphics Interface Conference, Halifax (USA), 3-5 June, 2015; Authors version Part of collection Institutional Repository Document type conference paper Rights (c) 2015 The Authors Files PDF 326345.pdf 5.63 MB Close viewer /islandora/object/uuid:67e72f05-8c31-448b-95d1-bbce9cee4264/datastream/OBJ/view