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Real-Time Rendering of Plant Leaves
August 1, 2005
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BibTex
Authors

Lifeng Wang

Wenle Wang

Julie Dorsey

Xu Yang

Baining Guo

Heung-Yeung Shum
Publication Type
Inproceedings
Publisher
Association for Computing Machinery, Inc.
Copyright © 2004 by the Association for Computing Machinery, Inc. Permission to make
digital or hard copies of part or all of this work for personal or classroom use is granted without
fee provided that copies are not made or distributed for profit or commercial advantage and that
copies bear this notice and the full citation on the first page. Copyrights for components of this
work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy
otherwise, to republish, to post on servers, or to redistribute to lists, requires prior specific
permission and/or a fee. Request permissions from Publications Dept, ACM Inc., fax +1 (212)
869-0481, or permissions@acm.org. The definitive version of this paper can be found at
ACM’s Digital Library –http://www.acm.org/dl/.

Abstract
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Related Info
Abstract
This paper presents a framework for the real-time rendering of plant leaves with global
illumination effects. Realistic rendering of leaves requires a sophisticated appearance model and
accurate lighting computation. For leaf appearance we introduce a parametric model that
describes leaves in terms of spatially-variant BRDFs and BTDFs. These BRDFs and BTDFs,
incorporating analysis of subsurface scattering inside leaf tissues and rough surface scattering on
leaf surfaces, can be measured from real leaves. More importantly, this description is compact
and can be loaded into graphics hardware for fast run-time shading calculations, which are
essential for achieving high frame rates. For lighting computation, we present an algorithm that
extends the Precomputed Radiance Transfer (PRT) approach to all-frequency lighting for leaves.
In particular, we handle the combined illumination effects due to lowfrequency environment
light and high-frequency sunlight. This is done by decomposing the local incident radiance of
sunlight into direct and indirect components. The direct component, which contains most of the
high frequencies, is not pre-computed with spherical harmonics as in PRT; instead it is evaluated
on-the-fly using pre-computed light-visibility convolution data. We demonstrate our framework
by the rendering of a variety of leaves and assemblies thereof.
Related Info
Related Files
 description.doc
 leaf.pdf
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