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Apparent relief: a shape descriptor for stylized shading

Romain Vergne 1, 2 Pascal Barla 1, 2, * Xavier Granier 1, 2 Christophe Schlick 1, 2
* Corresponding author
1 IPARLA - Visualization and manipulation of complex data on wireless mobile devices
Université Sciences et Technologies - Bordeaux 1, Inria Bordeaux - Sud-Ouest, École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB), CNRS - Centre National de la Recherche Scientifique : UMR5800
Abstract : Shape depiction in non-photorealistic rendering of 3D objects has mainly been concerned with the extraction of contour lines, which are generally detected by tracking the discontinuities of a given set of shape features varying on the surface and/or the picture plane. In this paper, we investigate another approach: the depiction of shape through shading. This technique is often used in scientific illustration, comics, cartoon animation and various other artwork. A common method consists in indirectly adapting light positions to reveal shape features; but it quickly becomes impractical when the complexity of the object augments. In contrast, our approach is to directly extract a set of shape cues that are easily manipulated by a user and re-introduced during shading. The main problem raised by such an approach is that shape cues must be identified in a continuous way in image space, as opposed to line-based techniques. Our solution is a novel view-dependent shape descriptor called Apparent Relief, which carries pertinent continuous shape cues for every pixel of an image. It consists of a combination of object- and image-space attributes. Such an approach provides appealing properties: it is simple to manipulate by a user, may be applied to a vast range of styles, and naturally brings levels-of-detail functionalities. It is also simple to implement, and works in real-time on modern graphics hardware.
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Submitted on : Sunday, October 27, 2013 - 12:01:19 PM
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Romain Vergne, Pascal Barla, Xavier Granier, Christophe Schlick. Apparent relief: a shape descriptor for stylized shading. NPAR '08: Proceedings of the 6th international symposium on Non-photorealistic animation and rendering, Jun 2008, Annecy, France. pp.23-29, ⟨10.1145/1377980.1377987⟩. ⟨inria-00277084v2⟩



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