Modélisation implicite par squelette et Applications

Cédric Zanni 1
1 IMAGINE - Intuitive Modeling and Animation for Interactive Graphics & Narrative Environments
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, INPG - Institut National Polytechnique de Grenoble
Abstract : Modeling with skeleton is an attractive alternative to "control points" usually placed outside a shape in order to model it: this paradigm, similar to a wire inside the modeled shape, enables model of arbitrary geometry and topology. In order to do so, shapes defined by skeletons should be able to smoothly blend together. Introduced in computer graphics in the 70's, implicit surfaces are one of the main solution to this problem. They are powerful both for the modeling of 3D models and their animations : their construction from a skeleton and their blending capacity by simply summing their scalar field provide an easy way to incrementally create shapes and store them in a compact way, it also facilitates animation containing changes in topology. Implicit surfaces, and more specifically Convolution surfaces, are therefore particularly well adapted to skeleton-based modeling. However, they present a number of drawback that make them difficult to use in practice. This thesis propose new skeleton-based implicit models, inspired not only by convolution but also from space deformations. They enable : - an easier generation of shape along curve skeletons (arcs of helix), - a better control of generated shape both in term of thickness and blending, in particular our model are scale-invariant that make them more intuitive, - the generation of shape which topology better reflects the topology of its skeleton, - the generation of small details from a procedural texture, the details behave in a coherent way with the underlying surface (and its skeleton).
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Cédric Zanni. Modélisation implicite par squelette et Applications. Synthèse d'image et réalité virtuelle [cs.GR]. Université Joseph-Fourier - Grenoble I, 2013. Français. ⟨tel-00922201⟩

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