An interface for creating and manipulating curves using a high degree-of-freedom curve input device

Abstract

Current interfaces for manipulating curves typically use a standard point cursor to indirectly adjust curve parameters. We present an interface for far more direct manipulation of curves using a specialized high degree-of-freedom curve input device, called ShapeTape. This device allows us to directly control the shape and position of a virtual curve widget. We describe the design and implementation of a variety of interaction techniques that use this curve widget to create and manipulate other virtual curves in 2D and 3D space. The input device is also used to sense a set of user gestures for invoking commands and tools. The result is an effective alternate user interface for curve manipulation that can be used in 2D and 3D graphics applications.

Tangible NURBS-curve manipulation techniques using graspable handles on a large display

“…We expect great synergy from combining the flexible curve creation ability of digital tape drawing with our sophisticated curve-modification techniques for an effective digital-design environment. In addition, an idiosyncratic method for creating and modifying curves by bending and twisting a strip-type input device exists [5,15]. Such a method gives the user high tangibility with a physical curve object that corresponds to a virtual curve widget on a computer screen, but is not compatible with one-to-one scale curve work.…”

“…Our GH includes one discrete controller that the designer uses to enter decision commands to confirm a specific action. Unlike small-display interactions [5,15], foot pedals are not suitable for large-display interaction. Based on user feedback about digital tape drawing [4], wireless operation of the GH is an essential feature, because a wire would obstruct the designer's two-handed motion during curve handling.…”

“…12(a)). In addition, the designer can replace the deformable range of a curve with part of the FT (partial copying or patterning) [15]. The connection between two curve portions is determined by whether one or two GHs are clicked (Fig.…”

Study on three-dimensional freehand stroke creation

“…There are some sketching systems developed, such as the early touching system, Sutherland's 5 SketchPad, the later optical input system, Grossman et al's 6 Shape Tape, digital tape drawing system, 7,8 and Gesture 3D 9 use liquid crystal display (LCD) digital pen as input.…”

Flow-complex-based shape reconstruction from 3D curves

“…We consider a relatively new variant of shape reconstruction, from a collection of unorganized 3D curves (see Figures 1,10). Curves are ubiquitous in art and design, and such 3D curves are the output of increasingly popular 3D sketching tools, such as ILoveSketch (ILS) [Bae et al 2008], analytic drawing [Schmidt et al 2009], or other 3D curve modeling interfaces [Grossman et al 2003].…”