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Decoupling structure and appearance for example-driven detail synthesis

Marie-Claude Frasson 1
1 REVES - Rendering and virtual environments with sound
CRISAM - Inria Sophia Antipolis - Méditerranée
Abstract : One of the goals of computer graphics is to produce realistic images. To this end, artists build complex geometric models covered by detailed textures. Unfortunately, depending on the target application and the available resources, they often have to "take shortcuts" by repeating textures or using coarse models whose details are simulated by a series of appearance layers. In order to create realistic 3D objects, the best inspiration source is the real world itself. In this context, we propose to help the artiste create these appearance layers by analyzing given examples. We first address the color texture layer, and in particular, structured textures. Indeed, these textures are hardly reproducible automatically and their visual repetition is annoying for an observer. In order to succeed in propagating these kinds of textures using a given sample, we propose to decouple the structure from the appearance.
We first handle the problem under a geometric aspect. The structured textures are represented by a 2D mesh which we analyze in order to extract a compact statistical description. This leads to the creation of a generator able to reproduce the input structure at will. The user is taken into account all along the process and can influence the result through the use of constraint maps. In parallel, we analyze the appearance of the structured texture in order to extract a small set of textures representing the materials used for the texture regions and their contour. This information allows us to efficiently texture any given synthesized structure.
In a third step, we use the texture and structure information, alongside additional user-provided input in
order to generate and propagate 3D details onto models. We propose a generic framework which should allow to relieve the artists from repetitive and tedious tasks. We apply this framework to the synthesis of displacement maps and present other application cases.
The set of techniques described allows to synthesize detailed structured textures from example, with a reduced memory usage and allowing for real-time rendering, while letting the user have control over various parts of the process.
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Marie-Claude Frasson. Decoupling structure and appearance for example-driven detail synthesis. Human-Computer Interaction [cs.HC]. Université Nice Sophia Antipolis, 2005. English. ⟨tel-00311788⟩

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