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A Sketching Interface for Freeform 3D Modeling

  • Chapter
Sketch-based Interfaces and Modeling

Abstract

This chapter introduces Teddy, a sketch-based modeling system to quickly and easily design freeform models such as stuffed animals and other rotund objects. The user draws several 2D freeform strokes interactively on the screen and the system automatically constructs plausible 3D polygonal surfaces. Our system supports several modeling operations, including the operation to construct a 3D polygonal surface from a 2D silhouette drawn by the user: it inflates the region surrounded by the silhouette making a wide area fat, and a narrow area thin. Teddy, our prototype system, is implemented as a Java program, and the mesh construction is done in real-time on a standard PC. Our informal user study showed that a first-time user masters the operations within 10 minutes, and can construct interesting 3D models within minutes. We also report the result of a case study where a high school teacher taught various 3D concepts in geography using the system.

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Notes

  1. 1.

    A stroke is recognized as scribbling when sl/pl>1.5, where sl is the length of the stroke and pl is the perimeter of its convex hull.

  2. 2.

    The normal of the ring is calculated as follows: Project the points of the ring to the original XY-plane. Then compute the enclosed “signed area” by the formula: \(A_{xy} = 0.5\times \sum_{i=0}^{n-1}(x[i]\times y[i+1]-x[i+1]\times y[i])\) (indices are wrapped around so that x[n] means x[0]). Calculate A yx and A zx similarly, and the vector v=(A yz ,A zx ,A xy ) is defined as the normal of the ring.

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    Authors
    1. Takeo Igarashi
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    Correspondence to Takeo Igarashi .

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    1. Instituto Superior Técnico, Depto. Engenharia Informática, Universidade Técnica de Lisboa, Avenida Rovisco Pais, Lisboa, 1049-001, Portugal

      Joaquim Jorge

    2. Dept. Computer Science, University of Calgary, University Drive NW 2500, Calgary, T2N 1N4, Alberta, Canada

      Faramarz Samavati

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    Igarashi, T. (2011). A Sketching Interface for Freeform 3D Modeling. In: Jorge, J., Samavati, F. (eds) Sketch-based Interfaces and Modeling. Springer, London. https://doi.org/10.1007/978-1-84882-812-4_8

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    • DOI: https://doi.org/10.1007/978-1-84882-812-4_8

    • Publisher Name: Springer, London

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