Invisible Seams

Nicolas Ray 1 Vincent Nivoliers 1 Sylvain Lefebvre 1, 2 Bruno Lévy 1
1 ALICE - Geometry and Lighting
INRIA Lorraine, LORIA - Laboratoire Lorrain de Recherche en Informatique et ses Applications
2 REVES - Rendering and virtual environments with sound
CRISAM - Inria Sophia Antipolis - Méditerranée
Abstract : Surface materials are commonly described by attributes stored in textures (for instance, color, normal, or displacement). Interpolation during texture lookup provides a continuous value field everywhere on the surface, except at the chart boundaries where visible discontinuities appear. We propose a solution to make these seams invisible, while still outputting a standard texture atlas. Our method relies on recent advances in quad remeshing using global parameterization to produce a set of texture coordinates aligning texel grids across chart boundaries. This property makes it possible to ensure that the interpolated value fields on both sides of a chart boundary precisely match, making all seams invisible. However, this requirement on the uv coordinates needs to be complemented by a set of constraints on the colors stored in the texels. We propose an algorithm solving for all the necessary constraints between texel values, including through different magnification modes (nearest, bilinear, biquadratic and bicubic), and across facets using different texture resolutions. In the typical case of bilinear magnification and uniform resolution, none of the texels appearing on the surface are constrained. Our approach also ensures perfect continuity across several MIP-mapping levels.
Type de document :
Communication dans un congrès
21st Eurographics Symposium on Rendering - EGSR 2010, Jun 2010, Saarbrücken, Germany. 2010
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Contributeur : Nicolas Ray <>
Soumis le : vendredi 17 décembre 2010 - 10:29:18
Dernière modification le : samedi 27 janvier 2018 - 01:31:34
Document(s) archivé(s) le : vendredi 18 mars 2011 - 02:43:14

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Nicolas Ray, Vincent Nivoliers, Sylvain Lefebvre, Bruno Lévy. Invisible Seams. 21st Eurographics Symposium on Rendering - EGSR 2010, Jun 2010, Saarbrücken, Germany. 2010. 〈inria-00547713〉

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