p409-igarashi

p409-igarashi - Teddy: A Sketching Interface for 3D...

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Teddy: A Sketching Interface for 3D Freeform Design Takeo Igarashi , Satoshi Matsuoka , Hidehiko Tanaka University of Tokyo, Tokyo Institute of Technology Abstract We present a sketching interface for quickly and easily designing 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 wide areas fat, and narrow areas 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 typically masters the operations within 10 minutes, and can construct interesting 3D models within minutes. CR Categories and Subject Descriptions: I.3.6 [Computer Graphics]: Methodology and Techniques – Interaction Techniques; I.3.5 [Computer Graphics]: Computational Geometry and Object Modeling – Geometric algorithms Additional Keywords: 3D modeling, sketching, pen-based systems, gestures, design, chordal axes, inflation 1 INTRODUCTION Although much progress has been made over the years on 3D modeling systems, they are still difficult and tedious to use when creating freeform surfaces. Their emphasis has been the precise modeling of objects motivated by CAD and similar domains. Recently SKETCH [29] introduced a gesture-based interface for the rapid modeling of CSG-like models consisting of simple primitives. This paper extends these ideas to create a sketching interface for designing 3D freeform objects. The essential idea is the use of freeform strokes as an expressive design tool. The user draws 2D freeform strokes interactively specifying the silhouette of an object, and the system automatically constructs a 3D polygonal surface model based on the strokes. The user does not have to manipulate control points or combine complicated editing operations. Using our technique, even first-time users can create simple, yet expressive 3D models within minutes. In addition, the resulting models have a hand-crafted feel (such as sculptures and stuffed animals) which is difficult to accomplish with most conventional modelers. Examples are shown in Figure 2. We describe here the sketching interface and the algorithms for constructing 3D shapes from 2D strokes. We also discuss the implementation of our prototype system, Teddy. The geometric representation we use is a standard polygonal mesh to allow the use of numerous software resources for post-manipulation and rendering. However, the interface itself can be used to create other representations such as volumes [25] or metaballs [17]. Like SKETCH [29], Teddy is designed for the rapid
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p409-igarashi - Teddy: A Sketching Interface for 3D...

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