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检索条件"任意字段=12th International Conference on Computer-Aided Design and Computer Graphics, CAD/Graphics 2011"

共 163 条记录，以下是91-100 订阅

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A Rapid Method of 3D Character Models' Diversity Used Micro-deformation

A Rapid Method of 3D Character Models' Diversity Used Micro-...

引用

IEEE international conference on computer-aided design and computer graphics

作者： Lin Li Zheng Wu Tao Tao Xiaoping Liu School of Computer & Information Hefei University of Technology Hefei China

An animation character, which has several duplications in one virtual scene, is usually represented just by a same 3D model. It results in monotonous and boring scenes. A micro-deformation method which can create an interesting scene include many 3D models of different shape from the same character is proposed in this paper. By geometric approximation the real-time algorithm of micro-deformation which uses elementary geometry and sweep geometry as the deformation reference objects is studied. the experiments on 3D game character demonstrate that the algorithm is real-time and effective. So it can be used in virtual scene to get an abundant and interesting scene.

关键词： Geometry Solid modeling three dimensional displays Vectors Computational modeling Deformable models Shape

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Row-Based Analysis of Structure Power/Ground Grids with General Purpose GPU

Row-Based Analysis of Structure Power/Ground Grids with Gene...

引用

IEEE international conference on computer-aided design and computer graphics

作者： Xu Yang Liang Tang Kun Huang Guoxing Zhao Xingxing Xing Zuying Luo School of Information Science and Technology Beijing Normal University Beijing China

As mega-scale power/ground (P/G) grids came into being, the IR drop analysis is of the daunting computational complexity. By taking the topological advantage of the structure P/G grids, this work uses the row-based analysis method to transform the mesh-circuit analysis into many parallel triangle-diagonal row-circuit analyses of far smaller complexity. then, the graphics Process Unit (GPU) is employed to fast solve these row circuits in the parallel style. And this work further employs the LU decomposition of the triple-diagonal matrix to increase the efficiency of our method. Experimental results show that our method out-performs the traditional methods implemented on CPU. For mega-scale P/G grids of 1-4 million nodes, our GPU-implemented method is 9-12 times faster than its CPU counterpart and 2-3 times faster than its OpenMP counterpart.

关键词： graphics processing unit Equations Mathematical model Algorithm design and analysis Partitioning algorithms Linear systems Central Processing Unit

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Lattice-Based Skinning and Deformation for Real-Time Skeleton-Driven Animation

Lattice-Based Skinning and Deformation for Real-Time Skeleto...

引用

IEEE international conference on computer-aided design and computer graphics

作者： Cheng-Hao Chen I-Chen Lin Ming-Han Tsai Pin-Hua Lu Department of Computer Science National Chiao Tung University Hsinchu Taiwan

In this paper, we present an efficient framework to deform polygonal models for skeleton-driven animation. Standard solutions of skeleton-driven animation, such as linear blend skinning, require intensive artist intervention and focus on primary deformations. the proposed approach can generate both low- and high-frequency surface motions such as muscle deformation and vibrations with little user intervention. Given a surface mesh, we construct a lattice of cubic cells embracing the mesh and we apply lattice-based smooth skinning to drive the surface primary deformation with volume preservation. Lattice shape matching with dynamic particles, in the meantime, is utilized for secondary deformations. Due to the highly parallel lattice structure, the proposed method is liable to GPU computation. Our results show that it is adequate to vividly real-time animation.

关键词： Shape Joints Lattices Bones Animation Heating

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Behavior-Based Simulation of Real-Time Crowd Evacuation

Behavior-Based Simulation of Real-Time Crowd Evacuation

引用

IEEE international conference on computer-aided design and computer graphics

作者： Changbo Wang Chenhui Li Yuhua Liu Jin Cui Tianlun Zhang Software Engineering Institute East China Normal University Shanghai China

Emergency evacuation has many applications in computer animation, virtual reality, architecture planning, safety science, etc. However, current methods most focus on the agent-based modeling and simulation. these simulation results can not consider the human behavior fully and their reliabilities are doubtable. this paper presents a new method to simulate the large-scale crowds in real-time and verify the evacuation data in complex environment. through analyzing the characteristics of human behavior in emergent condition, a mixed geometry-based ant colony evacuation model is firstly proposed. then, many behaviors of human are considered to calculate the best evacuation path, including autonomous avoidance, human's warning time, and preferential path selecting. the experimental results show that it is an effective method to simulate large-scale crowds in real time, because the verification makes the simulation more reliable as well as making human behavior logical and the virtual scene realistic.

关键词： Solid modeling Computational modeling Humans Real time systems Fires graphics processing unit Rendering (computer graphics)

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Convergence of Geometric Interpolation Using Uniform B-splines

Convergence of Geometric Interpolation Using Uniform B-splin...

引用

IEEE international conference on computer-aided design and computer graphics

作者： Yunhui Xiong Guiqing Li Aihua Mao College of Science South China University of Technology Guangzhou China School of Computer Science & Engineering South China University of Technology Guangzhou China

this paper investigates the convergence of an algorithm geometrically interpolating a given polygon using uniform quadratic and cubic B-splines respectively. the geometric interpolation method views the polygon itself as the initial guess of the control polygon of the B-spline and reduces the approximate error by iteratively updating the control points with the deviation from the interpolated vertices to their nearest foot points on the current B-spline curve. We demonstrate that the algorithm usually does not converge if the nearest points are searched on the whole curve and present a sufficient condition under which the algorithm is convergent, for quadratic and cubic B-splines respectively. Furthermore, we introduce a new strategy to update the control points incrementally. Experiments show that though our condition constrains the search range of the nearest points, it can still produce interpolation curves with the same high quality as the original method.

关键词： Interpolation Spline Convergence Bismuth Educational institutions Algorithm design and analysis design automation

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MCA-Based Animation of Fracturing Heterogeneous Objects

MCA-Based Animation of Fracturing Heterogeneous Objects

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IEEE international conference on computer-aided design and computer graphics

作者： Jiangfan Ning Huaxun Xu Bo Wu Liang Zeng Sikun Li Yueshan Xiong School of Computer Science National University of Defense Technology Changsha China

Existing techniques for animation of object fracture have a basic assumption that the object materials are homogeneous while most materials in real world are heterogeneous. To solve this problem, we introduce a novel method called MCA to simulate the fracture of heterogeneous materials. the method of movable cellular automata (MCA) is based on the discrete concept and provides advantages both of classical cellular automaton and discrete element methods. First, the object is represented as discrete sphere particles, named movable cellular automata, and then the MCA method is used to simulate the material and physical properties as well as to determine when and where the fracture occurs. To meet the real-time requirement, the MCA simulation is performed on GPU with CUDA in order to accelerate the complex calculation of automata's physical properties. After simulation, the results are directly sent to the vertex buffer object (VBO) for rendering to avoid the costly communication between CPU and GPU. the experimental results show the feasibility and effectiveness of the proposed method.

关键词： Automata graphics processing unit Materials Computational modeling Solid modeling Force Mathematical model

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A Unified Framework for Alpha Matting

A Unified Framework for Alpha Matting

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IEEE international conference on computer-aided design and computer graphics

作者： Xiao Lin Yang Shen Lizhuang Ma Zhihua Chen Academy of Information Technology Luoyang Normal University Luoyang China Department of Computer science Shanghai Jiao Tong University Shanghai China Department of Computer Science & Engineering East China University of Science & Technology Shanghai China

Many important alpha matting algorithms are proposed in recent years, which focus on how to solve the alpha value on image interactively. However, few papers discuss about why the border of opaque object in image is half-transparent. In this paper, we show how the optical principles produce the translucent effect on photography. We denote the matting problem in a unified form, by which form, we can analyze and compare different matting algorithm by comparing their sampling function and matting matrix. Our work can help us to propose and evaluate new matting algorithm. We also expand our framework to video matting and get an enhanced video matting algorithm.

关键词： Image color analysis Equations Bayesian methods Mathematical model Robustness Photography Educational institutions

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A 2D-3D Hybrid Approach to Video Stabilization

A 2D-3D Hybrid Approach to Video Stabilization

引用

IEEE international conference on computer-aided design and computer graphics

作者： Zhiyong Huang Fazhi He Xiantao Cai Yuan Chen Xiao Chen Computer School Wuhan University Wuhan China

In this paper, we introduce a novel 2D-3D hybrid video stabilization method which combines virtues of 2D and 3D video stabilization methods in one routine. It attempts to achieve high-quality camera motions and to retain full frame coherence in each frame, at while, ensure that local regions undergo a similarity transformation. We solve the stabilization problem by integrating 3D and 2D video stabilization methods into one routine. It smooths camera motions and explicitly employs local motion information which constraints video frames to be temporal coherent, and achieves high-quality video stabilization. Experiments show that our method not only can achieve high-quality camera motion on good 3D reconstructed scene, but also can deal with complicated videos containing near, large moving objects.

关键词： three dimensional displays Cameras Educational institutions Coherence computers Interpolation Robustness

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An Improved Cellular Genetic Algorithm with Evolutionary Rules for 3D Animation Modeling design

An Improved Cellular Genetic Algorithm with Evolutionary Rul...

引用

IEEE international conference on computer-aided design and computer graphics

作者： Xiaopeng Yang Hong Liu Yanhui Ding Hanchao Yu

In order to inspire and assist designers to create novel 3D animation modelings, an improved cellular genetic algorithm with evolutionary rules is proposed in this paper and applied in 3D animation modeling design. In this algorithm, ACIS rule expressions are used for deforming the initial 3D animation modeling created by Maya or 3D Max, and human-computer interaction which used expert knowledge to determine fitness function values of individuals is adopted to evaluate generated modelings. Tree-structure encoding is used for the generation and evolution of ACIS rule expressions and an evolutionary rule based on expert knowledge is introduced to reduce the number of human-computer interactions. Besides, a prototype system, called 3D Animation Modeling design System, is developed based on the proposed algorithm. the experimental results show that the proposed algorithm can automatically and efficiently generate a series of creative 3D animation modelings and reduce the number of human-computer interactions to some extent.

关键词： Solid modeling three dimensional displays Animation Genetic algorithms Computational modeling Encoding Algorithm design and analysis

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Real-Time Volume Caustics with Image-Based Photon Tracing

Real-Time Volume Caustics with Image-Based Photon Tracing

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IEEE international conference on computer-aided design and computer graphics

作者： Yuxiang Wang Bin Wang Li Chen Key Laboratory for Information System Security Ministry of Education of China China Department of Computer Science and Technology Tsinghua University China Tsinghua National Laboratory for Information Science and Technology China

Rendering of volume caustics in participating media is often expensive, even with different acceleration approaches. Basic volume photon tracing is used to render such effects, but rather slow due to its massive quantity of photons to be traced. In this paper we present an image-based volume photon tracing method for rendering volume caustics at real-time frame rates. Motivated by multi-image based photon tracing, our technique uses multiple depth maps to accelerate the intersection test procedure, achieving a plausible and fast rendering of volume caustics. Each photon dynamically selects the depth map layer for intersection test, and the test converges to an approximate solution using image space methods in a few recursions. this allows us to compute photon distribution in participating media while avoiding massive computation on accurate intersection tests with scene geometry. We demonstrate that our technique, combined with photon splatting techniques, is able to render volume caustics caused by multiple refractions.

关键词： Photonics Rendering (computer graphics) Estimation Media graphics processing unit Geometry Equations

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