Résumé
Foliage modeling and rendering is an important topic in virtual environment. Texture mapping and foliage simplification are usual solutions to forest navigation keeping leaf realism and with a fast speed. These two techniques are still used separately, so that their common advantages are not unified. A new technique is presented in this paper on a smooth transition between a textured leaf model and the one without texture by defining two functions: a leaf vein quadratic interpolation function and an implicit leaf contour function. The new foliage representation is a mixture of models with textures and models without textures, which is a balance between materials and geometry. Experiments demonstrate that our transition algorithm can be used as a continuous multiresolution representation of foliage, keeping high realism and high data compression in rendering plant foliage in large scenes.