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The Creation and Modification of 3D Models Using Sketches and Curves

  • Chapter
Sketch-based Interfaces and Modeling

Abstract

This chapter describes a pen-based modeling system for the styling design of 3D objects. Our system is tailored toward the rapid and natural design of styling features such as freeform curves and surfaces. In a typical scenario, the user begins by constructing the base wireframe model of the design object. For this, the user first sketches the initial feature curves on a very rough and simplified 3D template model. This template model acts as a platform that helps anchor users’ initial strokes in 3D space. Once the initial curves comprising the wireframe are constructed, the base 3D template is removed, leaving the user with a set of 3D curves. Next, through direct sketching, the user modifies the initially created curves to give them the precise desired form. After the desired wireframe is obtained, the user constructs interpolating surfaces that cover the wireframe. Finally, using two physically-based deformation tools, the user modifies the newly created surfaces to the desired shapes. Once the basic wireframe and surfaces are created, further details can be added using the same strategy of curve creation, curve modification, surface creation, and finally surface modification.

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Notes

  1. 1.

    S is the surface subtended by the rays emanating from the user’s viewpoint and passing through the newly designed 2D curve, as illustrated in Fig. 13.6b. This surface extends into 3D space and is not visible from the original viewpoint.

  2. 2.

    If the topology is unknown, it has to be computed automatically, or it must be manually specified by the user. Currently, we are working toward automatically computing the wireframe topology.

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Authors and Affiliations

    Authors
    1. Levent Burak Kara
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    2. Kenji Shimada
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    Correspondence to Levent Burak Kara .

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    Editors and Affiliations

    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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    Kara, L.B., Shimada, K. (2011). The Creation and Modification of 3D Models Using Sketches and Curves. In: Jorge, J., Samavati, F. (eds) Sketch-based Interfaces and Modeling. Springer, London. https://doi.org/10.1007/978-1-84882-812-4_13

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    • DOI: https://doi.org/10.1007/978-1-84882-812-4_13

    • Publisher Name: Springer, London

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    • Online ISBN: 978-1-84882-812-4

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