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Accelerating global illumination for physically-based rendering
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Bashford-Rogers, Thomas (2011) Accelerating global illumination for physically-based rendering. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b2521716~S15
Abstract
Lighting is essential to generate realistic images using computer graphics. The
computation of lighting takes into account the multitude of ways which light
propagates around a virtual scene. This is termed global illumination, and is
a vital part of physically-based rendering. Although providing compelling and
accurate images, this is a computationally expensive process. This thesis presents
several methods to improve the speed of global illumination computation, and
therefore enables faster image synthesis. Global illumination can be calculated in
an offline process, typically taking many minutes to hours to compute an accurate
solution, or it can be approximated at interactive or real-time rates.
This work proposes three methods which tackle the problem of improving the
efficiency of computing global illumination. The first is an interactive method
for calculating multiple-bounce global illumination on graphics hardware, which
exploits the power of the graphics pipeline to create a voxelised representation of
the scene through which light transport is computed. The second is an unbiased
physically-based algorithm for improving the efficiency of path generation when
calculating global illumination in complicated scenes. This is adaptive, and learns
information about the lighting in the scene as the rendering progresses, and uses
this to reduce variance in the image. In both common scenes used in graphics
and situations which involve difficult light paths, this method gives a 30 - 70%
boost in performance. The third method in this thesis is a sampling method
which improves the efficiency of the common indoor-outdoor lighting scenario.
This is done by both combining the lighting distribution with view importance,
and automatically determining the important areas of the scene in which to start
light paths. This gives a speed up of between three times, and two orders of
magnitude, depending on scene and lighting complexity.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software | ||||
Library of Congress Subject Headings (LCSH): | Computer graphics, Light -- Computer programs | ||||
Official Date: | 2011 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | School of Engineering | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Chalmers, Alan ; Debattista, Kurt | ||||
Extent: | xii, 199 leaves : ill., charts | ||||
Language: | eng |
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