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

Title, School
Title*:Radiance Transfer Using Spherical Harmonic Gradients
School:Universität des Saarlandes
Type of Thesis*:Master's thesis
Month:September
Year:2004


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
Download File(s):

Referees, Status, Dates
Status:Completed
Date Kolloquium:28 September 2004

Correlation
MPG Unit:Max-Planck-Institut für Informatik
MPG Subunit:Computer Graphics Group
Audience:Expert
Appearance:MPII WWW Server, MPII FTP Server, MPG publications list, university publications list, working group publication list, Fachbeirat, VG Wort


BibTeX Entry:
@MASTERSTHESIS{Annen:SHG:2004,
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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Editor(s)
Thomas Annen
Created
09/28/2004 11:06:34 AM
Revision
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Editor
Thomas Annen



Edit Date
28.09.2004 11:11:28