Sketching, Scaffolding, and Inking: A Visual History for Interactive 3D Modeling
Ryan Schmidt, Tobias Isenberg, Pauline Jepp, Karan Singh, Brian Wyvill
International Symposium on Non-Photorealistic Animation and Rendering (NPAR 2007) - Aug 2007

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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.



The visual scaffolding features described in thsi publication were implemented in a modified version of the ShapeShop 3D modeling software. You can download that version at Unfortunately, there is no documentation for this demo - please e-mail if you need to figure out how to use this software for research purposes.

BibTex Citation

  author       = "Ryan Schmidt and Tobias Isenberg and Pauline Jepp and Karan Singh and Brian Wyvill",
  title        = "Sketching, Scaffolding, and Inking: A Visual History for Interactive 3D Modeling",
  booktitle    = "NPAR '07: Proceedings of the 5th international symposium on Non-photorealistic animation and rendering",
  year         = "2007",
  pages        = "23--32", 
  url          = ""

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