CrossShade: Shading Concept Sketches Using Cross-Section Curves

Abstract : We facilitate the creation of 3D-looking shaded production drawings from concept sketches. The key to our approach is a class of commonly used construction curves known as cross-sections, that function as an aid to both sketch creation and viewer understanding of the depicted 3D shape. In particular, intersections of these curves, or cross-hairs, convey valuable 3D information, that viewers compose into a mental model of the overall sketch. We use the artist-drawn cross-sections to automatically infer the 3D normals across the sketch, enabling 3D-like rendering. The technical contribution of our work is twofold. First, we distill artistic guidelines for drawing cross-sections and insights from perception literature to introduce an explicit mathematical formulation of the relationships between cross-section curves and the ge- ometry they aim to convey. We then use these relationships to develop an algorithm for estimating a normal field from cross-section curve networks and other curves present in concept sketches. We validate our formulation and algorithm through a user study and a ground truth normal comparison. As demonstrated by the examples throughout the paper, these contributions enable us to shade a wide range of concept sketches with a variety of rendering styles.
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ACM Transactions on Graphics, Association for Computing Machinery, 2012, Proceedings of SIGGRAPH, 31 (4), 〈http://dl.acm.org/citation.cfm?doid=10.1145/2185520.2185541〉. 〈10.1145/2185520.2185541〉
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Dernière modification le : samedi 27 janvier 2018 - 01:31:36
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Cloud Shao, Adrien Bousseau, Alla Sheffer, Karan Singh. CrossShade: Shading Concept Sketches Using Cross-Section Curves. ACM Transactions on Graphics, Association for Computing Machinery, 2012, Proceedings of SIGGRAPH, 31 (4), 〈http://dl.acm.org/citation.cfm?doid=10.1145/2185520.2185541〉. 〈10.1145/2185520.2185541〉. 〈hal-00703202v2〉

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