Real-Time Rendering and Animation of Trees

Ralf Habel, Alexander Kusternig
Real-Time Rendering and Animation of Trees

Information

Abstract

This demonstration combines novel methods for physically accurate yet efficient rendering and animation of trees under dynamic lighting conditions. A new leaf shading method is used that models the high-frequency structures such as veins and bulges to reproduce all important lighting attributes on a physical basis. Those structures are also used to calculate the translucency of leaves, which is modeled with physically based subsurface scattering, incorporating self-shadowing, thickness variations and varying albedo. This allows consistent reflective and translucent shading without constraining lighting or animation for close-up views. The individual deformation and animation of leaves and branches is defined by their physical properties such as shape and elasticity. A structural mechanics model is solved and combined with a length correction to achieve a physically plausible bending. To model the tree-wind interaction, a spectral approach is applied that allows for a physically guided animation as well as a high level of control. The applied methods have been published in "Physically Based Real-time Translucency for Leaves (EGSR 2007)" and "Physically Guided Animation of Trees (Eurographics 2009)".

Additional Files and Images

Additional images and videos

low res video: Animation in SD (XVID.360p30) low res video: Animation in SD (XVID.360p30)
Screenshot: Screenshot Screenshot: Screenshot
video: Animation in HD (H.264.720p30) video: Animation in HD (H.264.720p30)

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BibTeX

@misc{Habel-09-RAT,
  title =      "Real-Time Rendering and Animation of Trees",
  author =     "Ralf Habel and Alexander Kusternig",
  year =       "2009",
  abstract =   "This demonstration combines novel methods for physically
               accurate yet efficient rendering and animation of trees
               under dynamic lighting conditions. A new leaf shading method
               is used that models the high-frequency structures such as
               veins and bulges to reproduce all important lighting
               attributes on a physical basis. Those structures are also
               used to calculate the translucency of leaves, which is
               modeled with physically based subsurface scattering,
               incorporating self-shadowing, thickness variations and
               varying albedo. This allows consistent reflective and
               translucent shading without constraining lighting or
               animation for close-up views. The individual deformation and
               animation of leaves and branches is defined by their
               physical properties such as shape and elasticity. A
               structural mechanics model is solved and combined with a
               length correction to achieve a physically plausible bending.
               To model the tree-wind interaction, a spectral approach is
               applied that allows for a physically guided animation as
               well as a high level of control. The applied methods have
               been published in "Physically Based Real-time Translucency
               for Leaves (EGSR 2007)" and "Physically Guided Animation of
               Trees (Eurographics 2009)". ",
  month =      aug,
  keywords =   "Real-Time Rendering, Trees, Animation",
  URL =        "https://www.cg.tuwien.ac.at/research/publications/2009/Habel-09-RAT/",
}