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How2Sketch: Generating Easy-To-Follow Tutorials for Sketching 3D Objects

Hennessey, JW; Liu, H; Winnemöller, H; Dontcheva, M; Mitra, NJ; (2017) How2Sketch: Generating Easy-To-Follow Tutorials for Sketching 3D Objects. In: I3D '17 - Proceedings of the 21st ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games. Association for Computing Machinery (ACM): New York, NY, US. Green open access

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Abstract

Accurately drawing 3D objects is difficult for untrained individuals, as it requires an understanding of perspective and its effects on geometry and proportions. Step-by-step tutorials break the complex task of sketching an entire object down into easy-to-follow steps that even a novice can follow. However, creating such tutorials requires expert knowledge and is a time-consuming task. As a result, the availability of tutorials for a given object or viewpoint is limited. How2Sketch addresses this problem by automatically generating easy-to-follow tutorials for arbitrary 3D objects. Given a segmented 3D model and a camera viewpoint,it computes a sequence of steps for constructing a drawing scaffold comprised of geometric primitives, which helps the user draw the final contours in correct perspective and proportion. To make the drawing scaffold easy to construct, the algorithm solves for an ordering among the scaffolding primitives and explicitly makes small geometric modifications to the size and location of the object parts to simplify relative positioning. Technically, we formulate this scaffold construction as a single selection problem that simultaneously solves for the ordering and geometric changes of the primitives. We demonstrate our algorithm for generating tutorials on a variety of man-made objects and evaluate how easily the tutorials can be followed with a user study.

Type: Proceedings paper
Title: How2Sketch: Generating Easy-To-Follow Tutorials for Sketching 3D Objects
Event: I3D 2017 - ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games
Location: San Francisco, California, USA
Dates: 25 February 2017 - 27 February 2017
ISBN: 9781450348867
Open access status: An open access version is available from UCL Discovery
DOI: 10.1145/3023368.3023371
Publisher version: http://dx.doi.org/10.1145/3023368.3023371
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science
URI: http://discovery.ucl.ac.uk/id/eprint/1512728
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