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Abstract: A new method of reverse engineering for fast, simple and interactive acquisition and reconstruction of a virtual three-dimensional (3D) model is presented. We propose an active stereo acquisition system, which makes use of two infrared cameras and a wireless active-pen device, supported by a reconstruction method based on subdivision surfaces. In the 3D interactive hand sketching process the user draws and refines the 3D style-curves, which characterize the shape to be constructed, by simply dragging the active-pen device; then the system automatically produces a low-resolution mesh that is naturally refined through subdivision surfaces. Several examples demonstrate the ability of the proposed advanced design methodology to produce complex 3D geometric models by the interactive and iterative process that provides the user with a real-time visual feedback on the ongoing work. [ABSTRACT FROM AUTHOR]

Abstract: This paper aims to develop a novel scheme for interactively deformable simulation with haptic feedback. All design modules are packaged and implemented, and the experiments are conducted to study the effects of interactive deformation. The study compares the experimental results of haptic feedback by different force propagation methods, according to the Hounsfield unit (HU) of volume data. Additionally, the estimation of optimal propagation depth is illustrated by using a mass–spring model. Finally, by using the proposed scheme, a haptic-based medical simulation system for brain surgery is investigated. The integration test results with haptic feedback scenarios show that the proposed development scheme can certainly comply with the design modules, and the deformable simulation and haptic force reach a good agreement. [Copyright &y& Elsevier]

Abstract: We present an interactive system called ArchiDNA for creating 2D and 3D conceptual drawings in architectural design. We developed a novel principle of shape generation called match-and-attach by analyzing drawing styles of a contemporary architect, Peter Eisenman. The process consists of user interaction techniques and a set of rules that decide how one or more shapes attach to another shape. One key ingredient of our process is a unique concept for the interactive semi-automatic shape generation that uses the combination of algorithmic rules of a computer and designers’ manual inputs. These techniques enable designers to use CAD software in the early stages of architectural designs to explore conceptual building forms. ArchiDNA dynamically responds to drawing inputs, configures 2D shapes, and converts them to 3D shapes in a similar style. We intend to complement existing CAD software and computational drawing pipelines for intuitive 2D and 3D conceptual drawing creation. [Copyright &y& Elsevier]

A framework is proposed for facilitating the exploration process during the early design phase through computational sketch synthesis and interactive 3D reconstruction. In that phase, designers concentrate on developing concepts through numerous alternatives. Therefore, they constantly sketch so that they can rapidly visualize their ideas. Recently, the design industry has attempted to streamline the design process by implementing 3D model generation in the early design phase so that ideas may be more thoroughly explored, thus improving concept and final design conformance; however, efficiency issues have arisen. In this study, a 3D computational sketch synthesis framework was developed comprising two major components. First, a robust method was proposed to synthesize design alternatives by interpolating an input sketch with sketches in a database so that unvisited combinations may be explored. Secondly, a novel interactive 3D model reconstruction method was developed to facilitate the shape transition of design elements so that designers can quickly evaluate the potential of a large number of design variations. Finally, an interface for design refinement was developed so that designs may be embodied by sketching over the 3D model. To test the proposed methodology, expert designers were recruited for a validation experiment with two conditions followed up by in-depth interviews. In the first condition, the participants were asked to sketch based on a design brief in their current working manner. In the second condition, they were asked to create designs using the proposed framework. It was tested whether there was a difference in the design outcomes. It was demonstrated that the proposed framework resulted in more satisfactory and higher-quality designs and generated design alternatives faster and in greater quantities. All participants agreed that the framework could be useful in the early design phase and responded that the proposed system provides more design inspiration than traditional design methods. Most importantly, it was demonstrated that the proposed framework could enhance the reevaluation potential of design concepts and assist in making better-informed design decisions. • A framework is proposed to facilitate the design exploration process in the early design phase. • Design alternatives are synthesized by interpolating an input sketch with sketches in the database. • An interactive 3D reconstruction method is proposed to facilitate the shape transition of design elements. • Experiments with experts are conducted to verify the proposed framework. [ABSTRACT FROM AUTHOR]