Proceedings of the 27th annual conference on Computer graphics and interactive techniques
WYSIWYG NPR: drawing strokes directly on 3D models
Proceedings of the 29th annual conference on Computer graphics and interactive techniques
Suggestive contours for conveying shape
ACM SIGGRAPH 2003 Papers
ACM SIGGRAPH 2003 Papers
Interactive rendering of suggestive contours with temporal coherence
Proceedings of the 3rd international symposium on Non-photorealistic animation and rendering
Wysiwyg npr: interactive stylization for stroke-based rendering of three-dimenisional animation
Wysiwyg npr: interactive stylization for stroke-based rendering of three-dimenisional animation
ACM SIGGRAPH 2006 Papers
Line drawings via abstracted shading
ACM SIGGRAPH 2007 papers
Apparent ridges for line drawing
ACM SIGGRAPH 2007 papers
Clip Art Rendering of Smooth Isosurfaces
IEEE Transactions on Visualization and Computer Graphics
ACM SIGGRAPH 2008 papers
Algorithm 887: CHOLMOD, Supernodal Sparse Cholesky Factorization and Update/Downdate
ACM Transactions on Mathematical Software (TOMS)
Line-art illustration of dynamic and specular surfaces
ACM SIGGRAPH Asia 2008 papers
Dynamic solid textures for real-time coherent stylization
Proceedings of the 2009 symposium on Interactive 3D graphics and games
Programmable rendering of line drawing from 3D scenes
ACM Transactions on Graphics (TOG)
Self-similar texture for coherent line stylization
NPAR '10 Proceedings of the 8th International Symposium on Non-Photorealistic Animation and Rendering
Active strokes: coherent line stylization for animated 3D models
NPAR '12 Proceedings of the Symposium on Non-Photorealistic Animation and Rendering
Temporal Coherence Methods in Real-Time Rendering
Computer Graphics Forum
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We describe a method to parameterize lines generated from animated 3D models in the context of animated line drawings. Cartoons and mechanical illustrations are popular subjects of non-photorealistic drawings and are often generated from 3D models. Adding texture to the lines, for instance to depict brush strokes or dashed lines, enables greater expressiveness, e.g. to distinguish between visible and hidden lines. However, dynamic visibility events and the evolving shape of the lines raise issues that have been only partially explored so far. In this paper, we assume that the entire 3D animation is known ahead of time, as is typically the case for feature animations and off-line rendering. At the core of our method is a geometric formulation of the problem as a parameterization of the space-time surface swept by a 2D line during the animation. First, we build this surface by extracting lines in each frame. We demonstrate our approach with silhouette lines. Then, we locate visibility events that would create discontinuities and propagate them through time. They decompose the surface into charts with a disc topology. We parameterize each chart via a least-squares approach that reflects the specific requirements of line drawing. This step results in a texture atlas of the space-time surface which defines the parameterization for each line. We show that by adjusting a few weights in the least-squares energy, the artist can obtain an artifact-free animated motion in a variety of typical non-photorealistic styles such as painterly strokes and technical line drawing.