Terrain Rendering
This research addresses important
issues involved in improving the quality of computer graphic images of
outdoor, natural scenes.
A realistic sky model. Rendering algorithms which simulate
atmospheric effects with a balance between accuracy, efficiency, and
usability.
Night. Physically accurate rendering of night scenes
involves modeling the direct appearance of the night sky and the
illumination coming from the Moon, the stars, the zodiacal light,
and the atmosphere. Adding perceptual realism when images of night
scenes are viewed under normal illumination requires the addition of
noise and the reduction of acuity without the introduction of
apparent blur.
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Physically accurate approximation for an
outdoor night scene, with correct illumination, stars, and clouds.
(Hogum Cirque, Wasatch Mountains, 1:00am)
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Standard and perceptually filtered
day-for-night imagery. The right image approximates the noise and
lack of acuity associated with viewing scenes at night.
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Generation rendering of Alpine Terrain. Visual simulation
applications involving outdoor terrain often require realistic imagery
that matches what is actually on the ground at a particular
location. Source data often consists of height maps and panchromatic
orthoimagery. Automated techniques are required to color the imagery,
remove inappropriate shadows and re-illuminate for the correct time
of day, add vegetation, and add seasonal effects such as snow.
Faculty
Peter
Shirley
William
B. Thompson
Students
Bill
Martin
Simon
Premoze
Collaborators
Steven
G. Parker
Publications
William B. Thompson, Peter Shirley, and James Ferwerda, "A Spatial
Post-Processing Algorithm for Images of Night Scenes, Journal of
Graphics Tools, vol. 7, number 1, 2002. (abstract/images)
Henrik Wann Jensen, Fredo Durand, Michael M. Stark, Simon Premoze,
Julie Dorsey and Peter Shirley, "A Physically-Based Night Sky Model", Siggraph
2001. ( Web
)
A. J. Preetham, Peter Shirley, and Brian Smits, "A Practical Analytic
Model for Daylight," SIGGRAPH 1999. ( Web )
Simon Premoze, William B. Thompson, and Peter Shirley, "Geospecific
Rendering of Alpine Terrain," Eurographics Rendering Workshop,
1999. ( Web
)
William B. Thompson, Gregory W. Thoenen, Ronald G. Moore, and Thompson
C. Henderson, "Extraction of Micro-Terrain Features," IMAGE '98
, August 1998. (
PDF )
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