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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/2274

Title: Visibility map for global illumination in point clouds
Authors: GORADIA, R
KANAKANTI, A
CHANDRAN, S
DATTA, A
Issue Date: 2007
Publisher: ASSOC COMPUTING MACHINERY
Citation: GRAPHITE 2007: 5TH INTERNATIONAL CONFERENCE ON COMPUTER GRAPHICS AND INTERACTIVE TECHNIQUES IN AUSTRALASIA AND SOUTHERN ASIA, PROCEEDINGS,39-+
Abstract: Point-sampled geometry has gained significant interest due to their simplicity. The lack of connectivity touted as a plus, however, creates difficulties in many operations like generating global illumination effects. This becomes especially true when we have a complex scene consisting of several models. The data is often hard to segment as individual models and hence not suitable for surface reconstruction. Inter-reflections in such complex scenes requires knowledge of visibility between point pairs. Computing visibility for point models is all the more difficult (than for polygonal models), since we do not have any surface or object information. We present in this paper a novel, hierarchical, fast and memory efficient algorithm to compute a description of mutual visibility in the form of a visibility map. Ray shooting and visibility queries can be answered in sub-linear time using this data structure. We evaluate our scheme. analytically, qualitatively, and quantitatively and conclude that these maps are desirable.
URI: http://dspace.library.iitb.ac.in/xmlui/handle/10054/15898
http://hdl.handle.net/100/2274
ISBN: 978-1-59593-912-8
Appears in Collections:Proceedings papers

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