共查询到20条相似文献,搜索用时 15 毫秒
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Yuwei Meng Author Vitae P.Y. Mok Author Vitae Xiaogang Jin Author Vitae 《Computer aided design》2010,42(4):310-877
Clothing computer design systems include three integrated parts: garment pattern design in 2D/3D, virtual try-on and realistic clothing simulation. Some important results have been obtained in pattern design and clothing simulation since the 1980s. However, in the area of virtual try-on, only limited methods have been proposed which are applicable to some defined garment styles or under restrictive sewing assumptions. This paper presents a series of new techniques from virtually sewing up complex garment patterns on human models to visualizing design effects through physical-based real-time simulation. We first employ an hierarchy of ellipsoids to approximate human models in which the bounding ellipsoids are optimized recursively. We also present a new scheme for including contact friction and resolving collisions. Four types of user interactive operation are introduced to manipulate cloth patterns for pre-positioning, virtual sewing and later obtaining cloth simulation. In the cloth simulation, we propose a simplified cloth dynamic model and an integration scheme to realize a high quality real-time cloth simulation. We demonstrate the robustness of our proposed systems by complex garment style virtual try-on and cloth simulation. 相似文献
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高德勇 《自动化与仪器仪表》2011,(5):168-169,172
对变互式虚拟现实系统的州论与技术进行了研究。理论研究主要针对二维数据存数捌席中的存储、二维坐标的对应算法及虚拟现实交互式技术的应用。存WEB环境下,能够创造一个实时逼真的虚拟现实环境,并将此环境应用于查询等交互式过程。 相似文献
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Interactive modeling and simulation of virtual manufacturing assemblies: An agent-based approach* 总被引:3,自引:0,他引:3
In this paper, an agent-based design and development of an interactive virtual environment for a manufacturing assembly process is described. Agents in the assembly are identified through their respective responsibilities and are implemented so that they coordinate between one another to accomplish the PC assembly/disassembly process. The robot agent, crucial to the assembly operation, is designed to handle multiple failure situations, wherein it coordinates with the part agent to accommodate the failure. 相似文献
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Focusing on social network theories, we examine the interactive influence of both group-level (i.e. community influences) and individual-level variables (intrinsic and extrinsic motivations) simultaneously as the drivers of Massively Multiplayer Online Role-Playing Game (MMORPG) players’ virtual purchase behavior. We demonstrate that several aspects of real-world behavior are reflected in virtual purchase behavior. Notably, normative interpersonal influences and community identity are critical drivers and moderators of virtual purchases. Moreover, clear advancement and enjoyment opportunities offer important triggers for virtual purchase behavior. This study provides insights for game developers to increase virtual purchases, and identifies domain-specificity of each gaming platform. 相似文献
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Xujie Li Hanli Zhao Hui Huang Zhongyi Hu Lei Xiao 《Multimedia Tools and Applications》2016,75(11):6431-6443
We propose a novel interactive image recoloring method by combining global and local optimization. Our approach assumes that each pixel is a linear transform of its neighbors which can be in spatial or feature space. Corresponding, a new framework for combining global and local energy optimization is designed and derived. By taking advantage of global and local color propagation, our approach requires only a few user scribbles to produce the high-quality results. We show various experimental results and comparisons on image recoloring. Compared with the state-of-the-art methods, our approach produces higher-quality results with only a small amount of user interaction than those only consider local propagation or global propagation approaches. 相似文献
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This paper presents a multimodal interactive system for non-visual (auditory-haptic) exploration of virtual maps. The system is able to display haptically the height profile of a map, through a tactile mouse. Moreover, spatial auditory information is provided in the form of virtual anchor sounds located in specific points of the map, and delivered through headphones using customized Head-Related Transfer Functions (HRTFs). The validity of the proposed approach is investigated through two experiments on non-visual exploration of virtual maps. The first experiment has a preliminary nature and is aimed at assessing the effectiveness and the complementarity of auditory and haptic information in a goal reaching task. The second experiment investigates the potential of the system in providing subjects with spatial knowledge: specifically in helping with the construction of a cognitive map depicting simple geometrical objects. Results from both experiments show that the proposed concept, design, and implementation allow to effectively exploit the complementary natures of the “proximal” haptic modality and the “distal” auditory modality. Implications for orientation & mobility (O&M) protocols for visually impaired subjects are discussed. 相似文献
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A hierarchically structured and constraint-based data model for intuitive and precise solid modeling in a virtual reality environment 总被引:3,自引:0,他引:3
Weiyin Ma Author Vitae Yongmin Zhong Author Vitae Shiu-Kit Tso Author Vitae Author Vitae 《Computer aided design》2004,36(10):903-928
This article proposes a hierarchically structured and constraint-based data model for intuitive and precise solid modeling in a virtual reality (VR) environment. The data model integrates a high level constraint-based model for intuitive and precise manipulation, a middle level solid model for complete and precise representation and a low-level polygon mesh model for real-time interactions and visualization in a VR environment. The solid model is based on a hybrid B-rep/CSG data structure. Constraints are embedded in the solid model and are organized at hierarchical levels as feature constraints among internal feature elements, part constraints among internal features and assembly constraints between individual parts. In addition to providing a complete and precise model representation and the support for real-time visualization, the proposed data model permits intuitive and precise interaction through constraint-based manipulations for solid modeling in a VR environment. This is a critical issue for product design in a VR environment due to the limited resolutions of today's VR input and output devices. 相似文献
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Novel high affinity compounds for human β2-adrenergic receptor (β2-AR) were searched among the clean drug-like subset of ZINC database consisting of 9,928,465 molecules that satisfy the Lipinski's rule of five. The screening protocol consisted of a high-throughput pharmacophore screening followed by an extensive amount of docking and rescoring. The pharmacophore model was composed of key features shared by all five inactive states of β2-AR in complex with inverse agonists and antagonists. To test the discriminatory power of the pharmacophore model, a small-scale screening was initially performed on a database consisting of 117 compounds of which 53 antagonists were taken as active inhibitors and 64 agonists as inactive inhibitors. Accordingly, 7.3% of the ZINC database subset (729,413 compounds) satisfied the pharmacophore requirements, along with 44 antagonists and 17 agonists. Afterwards, all these hit compounds were docked to the inactive apo form of the receptor using various docking and scoring protocols. Following each docking experiment, the best pose was further evaluated based on the existence of key residues for antagonist binding in its vicinity. After final evaluations based on the human intestinal absorption (HIA) and the blood brain barrier (BBB) penetration properties, 62 hit compounds have been clustered based on their structural similarity and as a result four scaffolds were revealed. Two of these scaffolds were also observed in three high affinity compounds with experimentally known Ki values. Moreover, novel chemical compounds with distinct structures have been determined as potential β2-AR drug candidates. 相似文献
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交互式图像分割是指在分割过程中引入少量的用户指引分割出目标对象,是图像处理最基本的任务之一。现有方法通常需要构建非二次能量函数,并且普遍存在缺乏唯一解、分割精度低等问题。为进一步提高分割质量,提出一种结合局部线性嵌入和种子信息的交互式图像分割算法(seed information combined with local linear embedding,SILLE)。该算法考虑像素点的局部信息以及先验信息,将标记种子点的信息融入到新构建的能量函数中,以一种有效且快速的最小化方案得到能量函数的唯一且最优解,从而获得更加准确的分割结果。最后在不同数据集上,与不同方法进行多种指标的对比,验证了算法的有效性和可行性。 相似文献
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Zbigniew A. Banaszak BoŻena Skolud Marek B. Zaremba 《Journal of Intelligent Manufacturing》2003,14(1):83-106
This paper presents a logistics framework to cope with the problem of planning and control of production flows processed on a set of work cells distributed among component firms of a virtual enterprise (VE). The constraints theory framework is employed to study constraint-based production flow coordination rules. The article discusses relationships linking structural parameters (e.g. buffer capacity, machine tool efficiency, and automated storage/retrieval systems) of VE components with material flow control guaranteeing efficient completion of work orders, and specified by such parameters as batch delivery periods, work-in-process (WIP) and make-span. The results are summarized in the form of a performance evaluation scheme. Examples using a software package that implements the proposed flow coordination methodology are provided. 相似文献
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This paper presents an interdisciplinary systems approach to service modeling, design and deployment. The study is based on a longitudinal case study of the development process of a complex logistic service system based on an advanced logistics model. The case examines the development of a Virtual Enterprise Architecture (VEA) for an automatic high-speed transport and sorting system applied in airports for baggage handling. The study traces the evolution of the system from the early conceptual phases to a successful commercial service deployed at Changi, Singapore Airport. The study is conducted using a retrospective analysis of the case using a design science research approach. The paper evaluates and discusses the issues of creating and designing a new complex logistics service, distinct from the physical product, based on an advanced discrete event-based simulation model. The paper concludes by presenting a generalized and validated conceptual framework for a VEA based on an advanced simulation model. The paper thus contributes to the field of service systems and service management by identifying a novel approach to effective design of a new service. 相似文献
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Network virtualization has been proposed as a technology that aims to solve the Internet ossification. Central to the network virtualization is a virtual network composition mechanism providing an efficient mapping of virtual nodes and links onto appropriate physical resources in the network infrastructure.This paper proposes a novel backtracking heuristic algorithm for virtual network composition. Based on this algorithm, two approaches with two different objectives are presented. The first approach (Backtracking-CR) aims to compose a virtual network using the least amount of network resources, while the second (Backtracking-LB) applies load balancing for virtual network composition. Furthermore, a linear programming approach that optimizes the virtual network composition with an objective of using the least amount of network resources is presented and used to bench mark the heuristic algorithm. Simulation results show that using less network resources by applying linear programming or Backtracking-CR does not produce higher number of successfully mapped virtual networks when is compared to load balancing approach. Results also show that the proposed heuristic algorithm is scalable to large physical and virtual networks with respect to the computation time. 相似文献
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虚拟油泥造型交互方法研究 总被引:3,自引:2,他引:1
虚拟油泥造型是一种新的计算机辅助工业设计方法,但目前虚拟油泥造型过程中使用的二维鼠标和键盘等人机交互设备无法体现油泥模型设计师的操作习惯,从而降低了造型过程的真实感和系统的交互能力,增加了造型过程的控制难度;根据虚拟油泥造型系统中刮削、填补和刮补造型操作的特点,考虑到设计操作中较为频繁的视图变换,研究了三维鼠标和力反馈设备的作用机理,提出了采用6自由度的三维鼠标和力反馈设备的新的交互方法,并使用Open Inventor开发包在虚拟油泥造型系统中进行了实现;该交互方法在虚拟油泥造型系统中得到了实际应用,效果良好,为设计人员创造力的发挥提供了一种新的途径. 相似文献
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P. Stadlbauer D. Mlakar H.-P. Seidel M. Steinberger R. Zayer 《Computer Graphics Forum》2020,39(2):277-289
The rich and evocative patterns of natural tessellations endow them with an unmistakable artistic appeal and structural properties which are echoed across design, production, and manufacturing. Unfortunately, interactive control of such patterns-as modeled by Voronoi diagrams, is limited to the simple two dimensional case and does not extend well tofreeform surfaces. We present an approach for direct modeling and editing of such cellular structures on surface meshes. The overall modeling experience is driven by a set of editing primitives which are efficiently implemented on graphics hardware. We feature a novel application for 3D printing on modern support-free additive manufacturing platforms. Our method decomposes the input surface into a cellular skeletal structure which hosts a set of overlay shells. In this way, material saving can be channeled to the shells while structural stability is channeled to the skeleton. To accommodate the available printer build volume, the cellular structure can be further split into moderately sized parts. Together with shells, they can be conveniently packed to save on production time. The assembly of the printed parts is streamlined by a part numbering scheme which respects the geometric layout of the input model. 相似文献