Sketching, Scaffolding, and Inking: A Visual History for Interactive 3D Modeling
Inspired by the comic-book production pipeline, a method is proposed for integrating visual aspects of the sketching process into 3D sketch-based modeling systems. In particular, artist-drawn construction aids called visual scaffolding are explored. Two scaffolding components which simulate elements of pencil sketching, geometric massing and eraser marks, are integrated into a rendering pipeline which also includes a suite of new object-space techniques for high-fidelity pen-and-ink depiction of implicit surfaces. Based on a hybrid, hierarchical approach which leverages both the implicit surface definition and an underlying coarse tessellation, new methods are described for computing silhouettes, suggestive contours, surface stippling, and surfel-based visibility culling. These techniques are real-time but require no pre-computation, allowing them to be applied to dynamic hierarchical implicit surfaces, and are demonstrated in ShapeShop, an interactive sketch-based modeling tool. The result is a real-time display pipeline which composites these novel scaffolding and pen-and-ink techniques to depict a visual history of the modeling process.
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You can download a demo of Ryan Schmidt's ShapeShop (for more information see the ShapeShop Website at http://www.shapeshop3d.com/) which includes the pen-and-ink rendering of implicit surfaces with the the scaffolding and inking.
- slides of the presentation at NPAR 2007 (PDF, 2.7MB)
- slides of the sketch presentation at SIGGRAPH 2006 (PDF, 4.3MB)
|Ryan Schmidt, Tobias Isenberg, and Brian Wyvill (2006) Interactive Pen-and-Ink Rendering for Implicit Surfaces. In Hanspeter Pfister, eds., ACM SIGGRAPH Conference Abstracts and Applications (SIGGRAPH, July 30–August 3, Boston, Massachusetts, USA). New York. ACM, 2006. Technical sketch. Also see the paper at NPAR 2007.|