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Kosinka, J., & Barton, M. (2010). Injective shape deformations using cube-like cages. Computer-Aided Design and Applications, 7(3), 309–318.
Abstract: The present paper investigates an application of Warrens coordinates for convex polytopes to space deformations. We show that the use of cube-like cages presents a good compromise between the degrees of freedom of the deformation and the complexity of the mapping itself. As our main result we give simple sufficient conditions on injectivity of deformations based on cube-like cages. © CAD Solutions, LLC.
Keywords: Computational mechanics;Geometry;Topology;
Notes: Barycentric coordinates;Convex polytopes;Degrees of freedom;Injectivity;Shape deformation;Space deformation;Sufficient conditions;
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Miura, K. T., Shirahata, R., & Agari, S. ichi. (2010). Non-stationarization of the typical curves and its extension to surfaces. Computer-Aided Design and Applications, 7(3), 297–308.
Abstract: It is known that if the degree of the typical plane Be}zier curve is increased infinitely, the curve will converge to the logarithmic (equiangular) spiral. The logarithmic spiral is one of log-aesthetic curves and they are formulated by ‘: the slope of the logarithmic curvature graph. In this paper we define the non-stationary typical Be}zier curve by making the transition matrix of the typical Be}zier curve non-stationary and dependent on each side of the control polyline and defining the transition matrix in the Frenet frame. We propose a method that generates a curve such that if its degree is increased infinitely it will converge to a log-aesthetic curve with arbitrary ‘ and ’: the slope of the logarithmic torsion graph in case of the space curve, by controlling the relationship between the rotation angle and the scaling factor. Furthermore we extend the non-stationarization for free-form surfaces and propose the non-stationary typical surface with the unit scaling factor. © 2010 CAD Solutions, LLC.
Notes: Control polyline;Free-form surface;Frenet frame;Log-aesthetic curve;Logarithmic curvature;Logarithmic spiral;Nonstationary;Rotation angles;Scaling factors;Space curve;Transition matrices;Typical curves;
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Uzuyama, D., Kikuta, M., & Miura, K. (2010). Development of a grain milling system by use of digital data. Computer-Aided Design and Applications, 7(3), 291–296.
Abstract: The surfaces of automobile interior parts have geometrically microfabricated, which are called grain. The purpose of our research is to mill dies with grain by use of their digital data. We generate microfabricated geometry data from a CAD model of a die with displacement mapping. With these geometry data, the die with grain is manufactured by milling. Our proposed method does not need chemicals, elaborated human skills or long time experiences, and can easily control grain mapping and the depth of grain milling. © 2010 CAD Solutions, LLC.
Keywords: Computer aided design;Dies;Mapping;Microfabrication;
Notes: Automobile interior parts;CAD models;Digital datas;Displacement mapping;Human skills;Microfabricated;Milling systems;
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Durupt, A., Remy, S., & Ducellier, G. (2010). KBRE: A knowledge based reverse engineering for mechanical components. Computer-Aided Design and Applications, 7(2), 279–289.
Abstract: This paper focuses on Reverse Engineering (RE) in mechanical design. RE is an activity which consists in creating a full CAD model from a 3D point cloud. The aim of RE is to enable an activity of redesign in order to improve, repair or update a given mechanical part. Nowadays, CAD models obtained using modern software applications are generally “frozen” because they are sets of triangles of free form surfaces. In such models, there are not functional parameters but only geometric parameters. This paper proposes the KBRE (Knowledge Based Reverse Engineering) methodology which allows managing and fitting manufacturing and/or functional features. Specific geometric algorithms are described. They allow extracting design intents in a point cloud in order to fit these features. © 2010 CAD Solutions, LLC.
Keywords: Computer aided design;Feature extraction;Knowledge based systems;Reverse engineering;Three dimensional;
Notes: 3D point cloud;CAD models;Design intent;Feature;Free-form surface;Functional features;Functional parameters;Geometric algorithm;Geometric parameter;Knowledge-based engineering;Mechanical components;Mechanical design;Mechanical parts;Point cloud;Segmentation;Software applications;
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Yang, X. B., Choi, S. H., Yuen, K. K., & Chan, L. K. Y. (2010). An intuitive human-computer interface for large display virtual reality applications. Computer-Aided Design and Applications, 7(2), 269–278.
Abstract: The paper presents a human-computer interface (HCI) for natural interaction in the Cave Automatic Virtual Environment (CAVE). By tracking hand actions and movements with a set of six infra-red (IR) cameras, the proposed HCI allows a user to interact directly with virtual objects in the CAVE without the need to attach any complex electronic tracking devices, such as data-gloves, on the users hands. An intuitive control scheme based on simple and natural hand gestures, including “grab” and “drop”, is developed to demonstrate the strengths of the HCI. A case study of using the HCI to facilitate the simulation of fork-lift truck operations in the CAVE system is presented. Finally, the compatibility and benefits of integrating the HCI with virtual reality (VR) simulation systems in the CAVE are discussed. © 2010 CAD Solutions, LLC.
Keywords: Caves;Human computer interaction;
Notes: Cave automatic virtual environments;Cave system;Electronic tracking;Fork lift trucks;Hand gesture;Hand tracking;Human computer interfaces;Infra red;Intuitive controls;Large displays;Natural interactions;Simulation systems;Virtual environments;Virtual objects;
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