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MPI-INF D4 Publications :: Thesis :: Annen, Thomas

MPI-INF D4 Publications
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Thesis - Master's thesis | @MastersThesis | Masterarbeit

Author(s)*:Annen, Thomas
BibTeX citekey*:Annen:SHG:2004

Title, School
Title*:Radiance Transfer Using Spherical Harmonic Gradients
School:Universität des Saarlandes
Type of Thesis*:Master's thesis

Note, Abstract, Copyright
LaTeX Abstract:Spherical harmonics are often used for compact description of incident radiance in low-frequency but distant

lighting environments. For interaction with nearby emitters, computing the incident radiance at the center of an
object only is not sufficient. Previous techniques then require expensive sampling of the incident radiance field at
many points distributed over the object. Our technique alleviates this costly requirement using a first-order Taylor
expansion of the spherical-harmonic lighting coefficients around a point. We propose an interpolation scheme
based on these gradients requiring far fewer samples (one is often sufficient). We show that the gradient of the
incident-radiance spherical harmonics can be computed for little additional cost compared to the coefficients
alone. We introduce a semi-analytical formula to calculate this gradient at run-time and describe how a simple
vertex shader can interpolate the shading. The interpolated representation of the incident radiance can be used
with any low-frequency light-transfer technique.

Keywords:Color, Shading, Shadowing and Texture
Download Access Level:Public
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Referees, Status, Dates
Date Kolloquium:28 September 2004

MPG Unit:Max-Planck-Institut für Informatik
MPG Subunit:Computer Graphics Group
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BibTeX Entry:
AUTHOR = {Annen, Thomas},
TITLE = {Radiance Transfer Using Spherical Harmonic Gradients},
SCHOOL = {Universit{\"a}t des Saarlandes},
YEAR = {2004},
TYPE = {Master's thesis}
MONTH = {September},

Entry last modified by Thomas Annen, 09/28/2004
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Thomas Annen
09/28/2004 11:06:34 AM

Thomas Annen

Edit Date
28.09.2004 11:11:28