ShapeShop

ACM SIGGRAPH 2007 …, 2007

2011

A technique is described for inflating 2D contours into rounded three-dimensional implicit volumes. Sketch-based modeling operations are defined that combine these basic shapes using standard blending and CSG operators. Since the underlying volume hierarchy is by definition a construction history, individual sketched components can be non-linearly edited and removed. For example, holes can be interactively dragged through a shape.

Smart Graphics, 2003

This paper presents a sketch-based modeling system for cre- ating objects that have internal structures. The user input consists of hand-drawn sketches and the system automatically generates a volu- metric model. The volumetric representation solves any self-intersection problems and enables the creation of models with a variety of topolog- ical structures, such as a torus or a hollow sphere. To

Computers & Graphics, 2009

2005

We present a sketch-based modeling system for interactive modeling of a variety of 3D objects. The idea is to construct and modify 3D objects, step by step, using a 2D template topology library. The library, called T-LIB, consists of 2D Edge Graphs and the corresponding algorithms to construct and modify 3D objects. The local part of 3D object around the sketch lines is analyzed as a 2D Edge Graph. Once the Edge Graph can be matched to a template of T-LIB, the 3D object can be generated in a basic shape reconstruction procedure, or modified in a 3D shape modification procedure. After obtaining the solid model, we use a fillet operation and a subdivision method to generate smooth surface objects.

Sketch-based Interfaces and Modeling, 2011

Trace figures are contour drawings of people and objects that capture the essence of scenes without the visual noise of photos or other visual representations. Their focus and clarity make them ideal representations to illustrate designs or interaction techniques. In practice, creating those figures is a tedious task requiring advanced skills, even when creating the figures by tracing outlines based on photos. To mediate the process of creating trace figures, we introduce the open-source tool Esquisse. Informed by our taxonomy of 124 trace figures, Esquisse provides an innovative 3D model staging workflow, with specific interaction techniques that facilitate 3D staging through kinematic manipulation, anchor points and posture tracking. Our rendering algorithm (including stroboscopic rendering effects) creates vector-based trace figures of 3D scenes. We validated Esquisse with an experiment where participants created trace figures illustrating interaction techniques, and results show that participants quickly managed to use and appropriate the tool.

Proceedings of the 21st …, 2005

2005

Abstract We present an implicit modeling system as a tool for creating a wide range of aesthetic models. Because of their ability to form blends and produce both organic shapes as well as man-made objects, implicit surfaces are a good medium for artists seeking new ways to experiment with 3D modeling. Implicit models can be created using our sketch-based modeling tool Shapeshop and also by using a procedural interface.

Journal of Engineering Design, 2007

Computational methods to support sketching, reverse engineering, and optimization of shapes The shape has a unique role in product design. On the one hand, it allows to realize mechanical functions, on the other hand, it supports achieving positive aesthetic impressions and use experiences. For engineering designers, the shape is defined by technical requirements, functionality, physical principles, structure, ways of materialization, and manufacturing technologies, while for industrial designers it is determined by aesthetics, ergonomics, usability of and experiences with products. This duality gives rise to many challenges when it comes to computer support of shape design and optimization. There is an intensive research into efficient computer-oriented methods and tools that would be able to concurrently support conceptualization, detailing, and optimization of shapes from the aspects of both engineering design and industrial design. Various solutions have been proposed in the past years, the majority of which addresses specific problems of either engineering design or industrial design. For this special issue, we have selected papers that consider both human aspects and engineering aspects, to some extent, in the definition of the shape of products. These papers show not only the efficiency, but also the flexibility of these methods in terms of processing deterministic or stochastic, formal or tacit, static or dynamic, and incomplete or complete information and knowledge. What is common in the proposed solutions is that they rely on a computational basis. Though the computational principles and target applications vary in a wide range, a common feature is that they tend to adopt computational approaches to engineering design of shapes that have been previously used to support industrial design, and vice versa. It tells us that future computational tools for shape design will integrate the aspects of engineering design and industrial design more intensively, and will provide a multifunctional toolkit for shape designers. Actually, the selected papers belong to three topic groups which deal with computational issues of sketching shape in industrial design, reverse engineering of shapes, and shape optimization, respectively. We believe that these novel computer oriented methods and tools are not only important from an academic point of view, but also valuable for the industrial practice. From the pool of papers submitted to the Sixth International Symposium on Tools and Methods of Competitive Engineering (TMCE 2006), we picked up those which report on mature research and results that had been tested through practical application. The first paper titled "Semantic-based operators to support car sketching", co-authored by Cheutet, V., Catalano, C.E., Giannini, F., Monti, M., Falcidieno B. and Leon, J.C., addresses the problem of sketch interpretation with the goal to support higher level interaction with shape concepts when they are represented in digital forms. The authors propose an ontology of the

Proceedings of the 5th …, 2007