Title: Reliable Soft Shadows over Implicit Surfaces
Authors: Flórez-Díaz, Jorge
Sbert, Mateu
Citation: WSCG 2010: Full Papers Proceedings: 18th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision in co-operation with EUROGRAPHICS, p. 151-158.
Issue Date: 2010
Publisher: Václav Skala - UNION Agency
Document type: konferenční příspěvek
URI: http://wscg.zcu.cz/WSCG2010/Papers_2010/!_2010_FULL-proceedings.pdf
ISBN: 978-80-86943-88-6
Keywords: měkké stíny;implicitní plochy;sledování paprsku;Interval Arithmetic
Keywords in different language: soft shadows;implicit surfaces;ray tracing;Interval Arithmetic
Abstract: This paper introduces an efficient and reliable algorithm to create soft shadows for ray traced implicit surfaces. In a classical soft shadow creation process, many rays have to be traced to calculate how much of the area light is visible from a point. In our approach, we trace from a point a beam that covers the area light. If the beam is not occluded, the point can be safely discarded because the use of Interval Arithmetic guarantees that the point is fully lit by the area light. In this case, extra rays are not traced, thus extra intersection tests are not required. Our soft shadow algorithm is then 38% to 59% faster than an algorithm based in a regular number of beams traced for each point. Besides, the using of beams based on Interval Arithmetic guarantees that thin details of the surfaces are not lost during the process.
Rights: © Václav Skala - UNION Agency
Appears in Collections:WSCG 2010: Full Papers Proceedings

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Please use this identifier to cite or link to this item: http://hdl.handle.net/11025/10854

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