Geometry and Graphics Group
Natural Phenomena
The simulation of natural phenomena is a very challenging research field in computer graphics. Some of the topics we are interested in are aging processes, weathering, fluid simulation, vegetation, and athmospheric or gaseous phenomena. In this sense, we have done some research on:
Realistic simulation of surface imperfections
Our objective is to provide accurate and realistic models for the simulation of surface defects, specially scratches and similar features. In this sense, we have worked on a model to derive the geometry of these features directly from the description of a scratch process, and on several methods for their accurate rendering with almost no restrictions on their size, geometry or distribution over the surface.
In cooperation with Université de Limoges

More info: SIPI Project
Animation and rendering of rain and water flows
In cooperation with Université de Limoges
Capture and interactive rendering of trees
The method captures and renders existing trees from photographs, by estimating opacity in a volume, then generating and displaying view-dependent textures attached to cells of the volume.
From left to right:
    - One of the original photographs of an oak.
    - The a mask used for the opacity estimation.
    - Two cross slices of the resulting opacity.
    - A synthetic image of the original view, using the view-dependent rendering.
Billboard cloud tree rendering
The multi-layered indirect texturing is a method to render in real time complex trees using a billboard clouds as an impostor simplification for the original polygonal tree, combined with a texture-based representation for the foliage. The method preserves the parallax effects of the original polygonal model, the overlapping of the leaves and provides high-definition close views without introducing high memory requeriments.
Simulation of light scattering in participating media: Fog, smoke or similar phenomena