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Flower solid modeling based on sketches

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第4期9卷 481-488页

作者： Zhan DING Shu-chang XU Xiu-zi YE Yin ZHANG San-yuan ZHANG State Key Lab of CAD ＆ CG School of Computer Science Zhejiang University Hangzhou 310027 China

In this paper we propose a method to model flowers of solid shape. Based on (Ijiri et al., 2005)’s method, we separate individual flower modeling and inflorescence modeling procedures into structure and geometry modeling. We incorporate interactive editing gestures to allow the user to edit structure parameters freely onto structure diagram. Furthermore, we use free-hand sketching techniques to allow users to create and edit 3D geometrical elements freely and easily. The final step is to automatically merge all independent 3D geometrical elements into a single waterproof mesh. Our experiments show that this solid modeling approach is promising. Using our approach, novice users can create vivid flower models easily and freely. The generated flower model is waterproof. It can have applications in visualization, animation, gaming, and toys and decorations if printed out on 3D rapid prototyping devices.

关键词： solid modeling Floral diagram Inflorescence Gesture Constrained Delauny triangulation (CDT) Freehand sketching

Radial Supershapes for solid modeling

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Journal of Computer Science & Technology 2006年第2期21卷 238-243页

作者： Yohan D. Fougerolle Andrei Gribok Sebti Foufou Frederic Truchetet Mongi A. Abidi Le2i Lab. UMR CNRS 5158 Universitd de Bourgogne 12 rue de la fonderie 71200 Le Creusot France IRIS Lab. The University of Tennessee Ferris Hall Knoxville 37996 TAT U.S.A.

In the previous work, an efficient method has been proposed to represent solid objects as multiple combinations of globally deformed supershapes. In this paper, this framework is applied with a new supershape implicit function that is based on the notion of radial distance and results are presented on realistic models composed of hundreds of hierarchically globally deformed supershapes. An implicit equation with guaranteed differential properties is obtained by simple combinations of the primitives~ implicit representations using R-function theory. The surface corresponding to the zero-set of the implicit equation is efficiently and directly polygonized using the primitives,parametric forms. Moreover, hierarchical global deformations are considered to increase the range of shapes that can be modeled. The potential of the approach is illustrated by representing complex models composed of several hundreds of primitives inspired from CAD models of mechanical parts.

关键词： implicit surface solid modeling superquadrics supershape

Constraint-Based Virtual solid modeling

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Journal of Computer Science & Technology 2000年第1期15卷 56-63页

作者：高曙明万华根彭群生 State Key Laboratory of CAD & CG Zhejiang University Hangzhou P.R. China

Constraint-based solid modeling is the kernel part of current CADsystems. It has been widely used in supporting detailed design and variational design. However, it cannot support early stage design and is not easy-to--use becauseit demands fully detailed input description of a design. To solve these problems,researchers attempt to incorporate virtual reality techniques into geometric modeling systems. This paper presents a novel approach for interactive constraint-basedsolid modeling in a virtual reality environment. The approach allows the designerto construct and edit a constraint-based solid model by direct 3D manipulations,and ensures the created solid model to be precise by recognizing and solving geometric constraints. To effectively support 3D manipulations and change propagation,a new constraint-based solid model is adopted. In the model, besides the normalconstituents of the typical constraint-based solid model, some new attributes likeshape control points, location pattern and explicit shape constraints of a primitiveare defined. Guided by the location pattern, our algorithms for recognizing andsolving location constraints are real-time.

关键词： 3D manipulation solid modeling virtual environment constraint

A Sufficient Condition for a Wire-Frame Representing a solid modeling Uniquely

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Journal of Computer Science & Technology 2001年第6期16卷 595-598页

作者：汪嘉业陈辉王文平 DepartmentofComputerScience ShandongUniversityJinan250100P.R.China

Generally speaking, it is impossible for a wire-frame to define a 3D object uniquely. But wire-frame as a graphics medium is still applied in some industrial areas. A sufficient condition is presented in this paper. If this condition is satisfied by a wire-frame, then the wire-frame can represent a 3D object uniquely The result is applied to manufacturing of progressive stripe.

关键词： wire-frame solid modeling CSG tree (constructive solid geometry tree) com- puter aided manufacturing

Study on complicated solid modeling and Cartesian grid generation method

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Science China(Technological Sciences) 2014年第3期57卷 630-636页

作者： QIN Qiang HU ChangZhen MA TianBao School of Computer Science and Technology Beijing Institute of Technology School of Software Beijing Institute of Technology State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

A Cartesian grid generation method is developed in this *** kinds of solid modeling methods,CSG and STL models,are used for complicated solid *** staircase boundary approximation is implemented to handle irregular geometries and the computational domain is discretized using a regular Cartesian *** the edge-based integral slice algorithm,the models are sliced with a set of parallel planes to generate 2D slices *** scan line filling technique is used to achieve grid generation after *** grid generation examples with a CSG model and a STL model are given to test the capability of the grid generation *** grid displaying,a method is proposed to remove the hidden surfaces fasten based on the topology of orthogonal hexahedral *** parallelization of grid displaying is achieved by employing multi-threaded parallel *** test results show that the parallel algorithm has the absolute advantage on speed compared to the serial algorithm.

关键词： solid modeling grid generation Cartesian grid staircase boundary treatment

Virtual Reality Based solid modeling

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Virtual Reality Based Solid Modeling

Research on Three-Dimensional Simulation of the Internal Arc Gear Skiving

第五届全球智能控制与自动化大会会议

作者： Yongmin Zhong and Xiaobu YuanSchool of Computer ScienceUniversity of Windsor Windsor Ontario N9B 3P4 Canada Weiyin Ma Dep. of Manufacturing Engineering & Engineering ManagementCity University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong

＜正＞ This paper presents an approach for intuitive and precise solid modeling in virtual reality environments. It develops a hierarchically structured and constraint-based data model to support object modeling, and uses automatic constraint recognition and precise constraint satisfaction to assist object manipulation. The proposed data model integrates a high-level constraint-based model, a mid-level hybrid solid model, and a low-level polygon model for object definition, object creation, and real-time interaction respectively. Constraint-based modeling operations and typical locating methods are also provided in the paper with details.

关键词： Virtual reality solid modeling model representation constraint-based manipulations.

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Mechanical Engineering Science 2024年第1期6卷 35-40页

作者： Xiaoqiang WU Rui XUE Erkuo GUO Dongzhou JIA Taiyan GONG Zengrong LI Haijun YANG Xiaoxue LI Xin JIANG Shuai DING Yong LIU Shitian LI School of Mechanical and Traffic Engineering Ordos Institute of TechnologyOrdosInner Mongolia017000China Tianjin TANHAS Technology Co. LTDTianjin301600China School of Mechanical Engineering Jiangsu UniversityZhenjiangJiangsu212002China College of Mechanical Engineering and Automation Liaoning University of TechnologyJinzhouLiaoning121001China Inner Mongolia Ruite Precision Mould Co. LTD.The First Machinery GroupBaotouInner Mongolia014030China Inner Mongolia University Of Technology College Of Energy And Power EngineeringHohhotInner Mongolia010051China

Aiming at the problems that the simulation accuracy which is reduced due to the simplification of the model,a three-dimensional simulation method based on solid modeling is being *** analyzing the motion relationship and positional relationship between the caries knife and the workpiece,the coordinate system of the caries machining was *** the MATLAB software,the cutting edge model and the blade sweeping surface model of the boring cutter are sequentially *** operation is performed on the blade swept surface formed by the tooth cutter teeth with time t and the workpiece tooth geometry as well as the undeformed three-dimensional chip geometry model and the instantaneous cogging geometry model are obtained at different *** the compare between gear end face simulation tooth profile and the theoretical inner arc tooth profile,we verified the accuracy and rationality of the proposed method.

关键词： gear skiving undeformed three-dimensional chips solid modeling

An Algorithm for Constructing 3D Struts

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Journal of Computer Science & Technology 2009年第1期24卷 56-64页

作者： George W.Hart Department of Computer Science Stony Brook UniversityStony BrookNY 11794U.S.A.

A simple robust ＂strut algorithm＂ is presented which, when given a graph embedded in 3D space, thickens its edges into solid struts. Various applications, crystallographic and sculptural, are shown in which smooth high-genus forms are the output. A toolbox of algorithmic techniques allow for a variety of novel, visually engaging forms that express a mathematical aesthetic. In sculptural examples, hyperbolic tessellations in the Poincare plane are transformed in several ways to three-dimensional networks of edges embodied within a plausibly organic organization. By the use of different transformations and adjustable parameters in the algorithms, a variety of attractive forms result. The techniques produce watertight boundary representations that can be built with solid freeform fabrication equipment. The final physical output satisfies the ＂coolness criterion,＂ that passers by will pick them up and say ＂Wow, that＇s cool!＂

关键词： sculpture solid modeling echinoderm algorithms fine arts computer-aided design

modeling and Measurement of 3D Solenoid Inductor Based on Through-Silicon Vias

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Chinese Journal of Electronics 2023年第2期32卷 365-374页

作者： YIN Xiangkun WANG Fengjuan ZHU Zhangming Vasilis F.Pavlidis LIU Xiaoxian LU Qijun LIU Yang YANG Yintang Shaanxi Key Lab.of Integrated Circuits and Systems School of Microelectronics Xidian University School of Automation and Information Engineering Xi'an University of Technique Department of Computer Science University of Manchester

Through-silicon via(TSV) provides vertical interconnectivity among the stacked dies in three-dimensional integrated circuits(3D ICs) and is a promising option to minimize 3D solenoid inductors for on-chip radio-frequency applications. In this paper, a rigorous analytical inductance model of 3D solenoid inductor is proposed based on the concept of loop and partial inductance. And a series of 3D samples are fabricated on 12-in high-resistivity silicon wafer using low-cost standard CMOS-compatible process. The results of the proposed model match very well with those obtained by simulation and measurement. With this model, the inductance can be estimated accurately and efficiently over a wide range of inductor windings, TSV height, space, and pitch.

关键词： Semiconductor device modeling Inductance Analytical models solid modeling Three-dimensional displays Integrated circuit modeling Inductors