Special Modelling

Texture modelling and synthesis are first studied in a general framework. Models for planar black and white textures are extensively studied. This work is then generalized to the colour case and to textures lying on 3D surfaces.Graftals may simulate various plants and trees. They are based upon the use of parallel rewriting grammars. Various fractal synthesis techniques are described next. A particular interest is given to Barnsley’s IFS (integrated function system) model. Particle systems of W Reeves simulate beautifully fires, plants and trees. Solid texturing is a new possibility to produce textured objects. A solid texture block is sculptured in order to obtain the desired object contour. We present the most striking applications of this technique by Perlin to the design of marble, glass objects, fires and bubbles, and for clouds by Gardner. Botanistic models of the French botanist De Reffye who discovered a model available for most types of trees and for their growth, are implemented by various French researchers from the AMAP group. Planar graphs of Lienhardt and Françon are used to model leaves and flowers grown more geometrically.This tutorial is dedicated mainly to advanced users and developers, and presents some non-standard techniques tractable to present particular objects (trees, plants etc...) and the texture of their surface.