Realistic Rendering of Plant Leaves

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Realistic Rendering of Plant Leaves

• COMP 236 Final Project
• Suddha Kalyan Basu
• May 9, 2006

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Motivation

• Plant leaves are composed of semi-transparent-tiss
  ues.
• Exhibit sub-surface scattering.
• Plain texture-mapping doesnt look realistic.

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Modeling Plant Leaves

• Modeled as thin shells
• Thin shells are different from general deformable
  objects like cloth, etc., as they have a
  undeformed curved shape.
• Energy of deformed leaf surfaces is modeled as a
  combination of flexural and membrane energies.

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Deformation of Leaves

• Bending forces help to preserve the overall
  shape.
• Membrane forces help to preserve the areas of
  triangulated tiles.

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Rendering Plant Leaves

• Properties
• Translucency
• Varying BRDF
• Glossiness
• Subsurface
• scattering
• (hard to model).

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Transparency map


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BRDF

• Varying BRDF is difficult to model for each leaf.
• Used the Henyey-Greenstein scattering model.

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Future Work

• Rendering model should be combined with a more
  elaborate geometric model of leaves.
• Real-time rendering of leaves.
• A more generalized model for a larger variety of
  leaves (hairy plants, conifers, etc.) .

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References

• Lifeng Wang and Wenle Wang and Julie Dorsey and
  Xu Yang and Baining Guo and Heung-Yeung Shum,
  "Real-Time Rendering of Plant Leaves", ACM Trans.
  Graph '05.
• Baranoski, G. V. G., and Rokne, J. 2002. Light
  Interaction with Plants. SIGGRAPH '02 Course
  Notes.
• Pat Hanrahan , Wolfgang Krueger, Reflection from
  layered surfaces due to subsurface scattering,
  Proceedings of the 20th annual conference on
  Computer graphics and interactive techniques,
  p.165-174, September 1993
• Jacquemoud, S., and Ustin, S. 2001. Leaf optical
  properties A state of the art. In Proc. 8th Int.
  Symp. Physical Measurements and Signatures in
  Remote Sensing, 223--232.
• http//www.cgmi.inf.uni-konstanz.de/download/down
  load_en.html