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Interactive Rendering of Trees with Shading and Shadows

Alexandre Meyer 1 Fabrice Neyret 1, * Pierre Poulin 2 
* Corresponding author
1 iMAGIS - Models, Algorithms and Geometry for Computer Generated Image Graphics
GRAVIR - IMAG - Laboratoire d'informatique GRAphique, VIsion et Robotique de Grenoble, Inria Grenoble - Rhône-Alpes
Abstract : The goal of this paper is the interactive rendering of 3D trees covering a landscape, with shading and shadows consistent with the lighting conditions. We propose a new IBR representation, consisting of a hierarchy of Bidirectional Textures, which resemble 6D lightfields. A hierarchy of visibility cube-maps is associated to this representation to improve the performance of shadow calculations. An example of hierarchy for a given tree can be a small branch plus its leaves (or needles), a larger branch, nd the entire tree. A Bidirectional Texture (BT) provides a billboard image of a shaded object for each pair of view and light directions. We associate a BT for each level of the hierarchy. When rendering, the appropriate level of detail is selected depending on the distance of the tree from the viewpoint. The illumination reaching each level is evaluated using a visibility cube-map. Thus, we very efficiently obtain the shaded rendering of a tree with shadows without loosing details, contrary to mesh simplification methods. We achieved 7 to 20 fps fly-throughs of a scene with 1000 trees.
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Submitted on : Thursday, November 18, 2010 - 3:49:18 PM
Last modification on : Friday, February 4, 2022 - 3:30:49 AM
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  • HAL Id : inria-00537504, version 1



Alexandre Meyer, Fabrice Neyret, Pierre Poulin. Interactive Rendering of Trees with Shading and Shadows. 12th Eurographics Workshop on Rendering Techniques, Jun 2001, London, United Kingdom. pp.183-196. ⟨inria-00537504⟩



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