Rossignac, Jarek

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    Finger Sculpting with Digital Clay: 3D Shape Input and Output through a Computer-Controlled Real Surface
    (Georgia Institute of Technology, 2003) Book, Wayne J. ; Glezer, Ari ; Ebert-Uphoff, Imme ; Shaw, Christopher D. ; Rossignac, Jarek ; Allen, Mark G. ; Rosen, David W. ; Askins, Stephen Alexander ; Bai, Jing ; Bosscher, Paul Michael ; Gargus, Joshua ; Kim, Byungmoon ; Llamas, Ignacio ; Nguyen, Austina Nga ; Yuan, Guang ; Zhu, Haihong
    The NSF Digital Clay project is focused on the design, prototyping, integration, and validation of a computer-controlled physical device capable of taking any of a wide range of possible shapes in response to changes in a digital 3D model or to changes in the pressure exercised upon it by human hands. Although it clearly is a natural and unavoidable evolution of 3D graphical user interfaces, its unprecedented capabilities constitute a major leap in technologies and paradigms for 3D display, for 3D input, and for collaborative 3D design. In this paper, we provide an overview of the Digital Clay project and discuss the challenges, design choices, and initial solutions for a new Finger Sculpting interface designed for the Digital Clay and prototyped using conventional 3D I/O hardware.
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    Twister: A Space-Warp Operator for the Two-Handed Editing of 3D Shapes
    (Georgia Institute of Technology, 2003) Llamas, Ignacio ; Kim, Byungmoon ; Gargus, Joshua ; Rossignac, Jarek ; Shaw, Christopher D.
    A free-form deformation that warps a surface or solid may be specified in terms of one or several point-displacement constraints that must be interpolated by the deformation. The Twister approach introduced here, adds the capability to impose an orientation change, adding three rotational constraints, at each displaced point. Furthermore, it solves for a space warp that simultaneously interpolates two sets of such displacement and orientation constraints. With a 6 DoF magnetic tracker in each hand, the user may grab two points on or near the surface of an object and simultaneously drag them to new locations while rotating the trackers to tilt, bend, or twist the shape near the displaced points. Using a new formalism based on a weighted average of screw displacements, Twister computes in realtime a smooth deformation, whose effect decays with distance from the grabbed points, simultaneously interpolating the 12 constraints. It is continuously applied to the shape, providing realtime graphic feedback. The two-hand interface and the resulting deformation are intuitive and hence offer an effective direct manipulation tool for creating or modifying 3D shapes.
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    Finger Sculpting with Digital Clay
    (Georgia Institute of Technology, 2002) Gargus, Joshua ; Kim, Byungmoon ; Rossignac, Jarek ; Shaw, Christopher D.
    "Digital Clay" is a term that signifies a computer-controlled physical surface, capable of taking any of a wide variety of possible shapes in response to changes in a digital 3D model or changes in the pressure exerted upon it by bare hands. The physical properties of such a device impose design and user-interface constraints not encountered in traditional, tracker-based software for the manipulation of virtual models. This paper describes the interaction techniques we have developed to work with this future medium. In particular, we present our solution for tracking the user's fingers using a local deformation of the surface, which we call a "blister", that senses the tangential and normal displacements of the finger. We also present a solution for creating variable-height bosses and creases with the simple sweep of a finger. Since the Digital Clay hardware is not yet operational, we have implemented a haptic simulation framework based on a PHANTOM device.