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Pacific (formerly Asia-Pacific APVIS) visualization Symposium

作者： Jiang Zhang Hanqi Guo Xiaoru Yuan Key Laboratory of Machine Perception (Ministry of Education) Peking University Mathematics and Computer Science Division Argonne National Laboratory Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University

ISBN: (纸本)9781509014521

We present a novel high-order access dependencies-based model for efficient pathline computation in unsteady flow visualization. By taking longer access sequences into account to model more sophisticated data access patterns in particle tracing, our method greatly improves the accuracy and reliability in data access prediction. In our work, high-order access dependencies are calculated by tracing uniformly seeded pathlines in both forward and backward directions in a preprocessing stage. The effectiveness of our approach is demonstrated through a parallel particle tracing framework with high-order data prefetching. Results show that our method achieves higher data locality and hence improves the efficiency of pathline computation.

关键词： Data visualization Prefetching Markov processes Data models Computational modeling Mathematical model Reliability

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A bottom-up scheme for user-defined feature comparison in ensemble data 15

A bottom-up scheme for user-defined feature comparison in en...

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SIGGRAPH Asia, SA 2015

作者： Liu, Richen Guo, Hanqi Yuan, Xiaoru School of EECS Peking University China Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University China Argonne National Laboratory United States

ISBN: (纸本)9781450339292

Most of the existing approaches to visualizing the vector field ensembles are achieved by visualizing the uncertainty of individual variables of different simulation runs, for example, geometry distance, statistics, variability etc. However, the comparison of the derived feature or user-defined feature (e.g. vortex) is also of vital significance since they often make more sense according to the domain knowledge. In this paper, we present a new framework to extract user-defined feature from different simulation runs. Specially, we use a bottom-up searching scheme to help extract vortex with a user-defined shape. We further compute the geometry information including the size, and the geo-spatial location of the extracted vortex, and design some link views to compare them between different runs. Results show that our method is capable of extracting user-defined feature across different runs and comparing them spatially and temporally.

关键词： visualization

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Real-Time Rendering of Large-Scale Ocean Environments

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Computer Aided Drafting,Design and Manufacturing 2015年第2期25卷 47-53页

作者： HUANG Jing-jia LI Sheng LAI Shun-nan WANG Guo-ping Peking University Shenzhen Graduate School Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University Beida (Binhai) Information Research

Simulation and rendering of large-scale natural environments, especially the ocean, has always been one of the hot issues in computer graphics, which can provide realism for various applications such as computer game, movie and military usage. Simulation of ocean environment is often lack of realism for real-time application due to its complexity of dynamic waves. In this paper, a method based on FFT Wave model is proposed to solve this problem, which can also simulate the ocean optic property with atmosphere scattering. Furthermore, our method has a lot of advantages including global ocean dataset support, real-time, dynamic reflection of ocean, the foam on the wave, smooth transition from deep ocean to seacoast, etc. The experimental results demonstrate the realism and effectiveness of our approach.

关键词： FFT wave model real-time rendering reflection refraction foam

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Real-time visualization of Urban with Gigantic Amount of Detailed Buildings

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Computer Aided Drafting,Design and Manufacturing 2015年第1期25卷 22-27页

作者： YANG Fei-yu LI Sheng WANG Shao-rong WANG Guo-ping Peking University Shenzhen Graduate School Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University Beida (Binhai) Information Research School of Information Science and Technology Beijing Forestry University

Complex urban scenery is generally composed of gigantic amount of detailed buildings, efficient representation and rendering are essential for its visualization. We present an accelerating method for urban visualization. Our approach can optimize the organization of models in accordance with the quadtree based terrain, which makes the parallelization easier. Through minimizing the draw call within one rendering process, our approach can reduce the time cost of each frame and improve the framerate greatly. Hereby, our system can handle large-scale detailed models with high diversity and also can afford the ability to adjust the rendering strategy automatically according to the state of the hardware.

关键词： urban visualization acceleration real-time detailed buildings

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High performance flow field visualization with high-order access dependencies

High performance flow field visualization with high-order ac...

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IEEE Scientific visualization Conference (SciVis)

作者： Jiang Zhang Hanqi Guo Xiaoru Yuan Key Laboratory of Machine Perception (Ministry of Education) Peking University Argonne National Laboratory Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University

We present a novel model based on high-order access dependencies for high performance pathline computation in flow field. The high-order access dependencies are defined as transition probabilities from one data block to other blocks based on a few historical data accesses. Compared with existing methods which employed first-order access dependencies, our approach takes the advantages of high order access dependencies with higher accuracy and reliability in data access prediction. In our work, high-order access dependencies are calculated by tracing densely-seeded pathlines. The efficiency of our proposed approach is demonstrated through a parallel particle tracing framework with high-order data prefetching. Results show that our method can achieve higher data locality than the first-order access dependencies based method, thereby reducing the I/O requests and improving the efficiency of pathline computation in various applications.

关键词： Prefetching Data visualization Computational modeling Data models Electronic mail Scalability Computational fluid dynamics

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A bottom-up scheme for user-defined feature exploration in vector field ensembles

A bottom-up scheme for user-defined feature exploration in v...

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IEEE Scientific visualization Conference (SciVis)

作者： Richen Liu Hanqi Guo Xiaoru Yuan Key Laboratory of Machine Perception (Ministry of Education) Peking University Argonne National Laboratory Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University

Most of the existing approaches to visualize vector field ensembles are achieved by visualizing the uncertainty of individual variables from different simulation runs. However, the comparison of the derived feature or user-defined feature, such as the vortex in ensemble flow is also of vital significance since they often make more sense according to the domain knowledge. In this work, we present a framework to extract user-defined feature from different simulation runs. Specially, we use a bottom-up searching scheme to help to extract vortex with a user-defined shape, and further compute the geometry information including the size, and the geo-spatial location of the extracted vortex. Finally we design some linked views to compare the feature between different runs.

关键词： Three-dimensional displays Meteorology visualization Feature extraction Computational modeling Data models Data visualization

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Hierarchical Mesh Segmentation Based on Quadric Surface Fitting

Hierarchical Mesh Segmentation Based on Quadric Surface Fitt...

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IEEE International Conference on Computer-Aided Design and Computer Graphics

作者： Huijuan Zhang Chong Li Leilei Gao Guoping Wang Graphics and Interaction Lab Peking University Beijing China Peking University Beijing Beijing CN Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University Beijing China Cooperative Medianet Innovation Center Beijing China

In this paper we introduce a hierarchical region decomposition algorithm for triangle meshes segmentation based on quadric surface fitting. Initially, the whole mesh represents a single cluster. At every iteration, the region with largest error is divided and Lloyd iteration clustering is executed following, which make sure the segmentation has the minimum error in each hierarchical level. An error control strategy is used to get finally result automatically. Besides, users also can interpose this process by specifying the segmentation level. Each segmentation region after this process has a best fitting proxy of quadric surface. We propose an improved L 2,1 distance into a hybrid error, which is used in least square fit of quadric function. By comparing with the state-of-the art methods, our method is testified to be insensitive to noise. Model optimization and hole filling based on our algorithm are demonstrated in the last.

关键词： Solid modeling Clustering algorithms Surface treatment Design automation Surface fitting Computational modeling Measurement

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Constructing Multiple Scene Graphs in Distributed Environment

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Computer Aided Drafting,Design and Manufacturing 2015年第1期25卷 16-21页

作者： XIA Rui WANG Guo-ping LI Sheng WANG Heng Shenzhen Key Lab for Cloud Computing Technology and Applications Shenzhen Graduate School of Peking University Graphics & Interaction Lab. School of Electronics Engineering and Computer SciencesPeking University Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University

Scene graph is a infrastructure of the virtual reality system to organize the virtual scene with abstraction, it can provide facility for the rendering engine and should be integrated effectively on demand into a real-time system, where a large quantities of scene objects and resources can be manipulated and managed with high flexibility and reliability. We present a new scheme of multiple scene graphs to accommodate the features of rendering engine and distributed systems. Based upon that, some other functions, e.g. block query, interactive editing, permission management, instance response, ＂redo＂ and ＂undo＂, are implemented to satisfy various requirements. At the same time, our design has compatibility to popular C/S architecture with good concurrent performance. Above all, it is convenient to be used for further development. The results of experiments including responding time demonstrate its good performance.

关键词： multiple scene graphs authority scene editing distributed systems

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Behavior analysis through collaborative visual exploration on trajectory data

Behavior analysis through collaborative visual exploration o...

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IEEE Symposium on Visual Analytics Science and technology (VAST)

作者： Tangzhi Ye Youfeng Hao Zhenhuang Wang Chufan Lai Siming Chen Zongru Li Jie Liang Xiaoru Yuan Key Laboratory of Machine Perception (Ministry of Education) Peking University Key Laboratory of Machine Perception (Ministry of Education) and School of EECS Peking University China Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University

In VAST Challenge 2015, we proposed a collaborative visual exploration system for behavior analysis over trajectory records. We discuss technical details in this report, in order to deliberate how the system supports multiple users to collaboratively analyze the same data, assist in sharing their findings, and constructing an overall picture of their insights.

关键词： Trajectory Collaboration Data visualization Visual analytics Logic gates Electronic mail

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Distribution and rendering of real-time scene based on the virtual reality system

Communications in Computer and Information Science

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Communications in Computer and Information Science 2014年 437卷 192-202页

作者： Zhang, Chengfang Wang, Guoping Wang, Guoping Shenzhen Graduate School Peking University Shenzhen China Graphics and Interaction Lab of EECS Peking University Beijing China Beijiing Engineering Technology Research Center of Virtual Simulation and Visualization Beijing China

ISBN: (纸本)9783662454978

There are differences between real and virtual scene information displayed on a virtual reality platform, not a true reflection of the reality of the real-time information. On the basis of virtual reality platform, how to collect, organize and publish the corresponding real-time virtual reality scene scenes information is becoming a new problem. In this essay, we will explain how to input, distribute and display real scene information based on the virtual reality system, a distributed virtual reality system. The current real-time video information corresponded with the specified scene object in the virtual reality system is recorded by the client, released to the streamer server and then distributed via content distribution server. The live streaming information displayed on the virtual reality client increases the fidelity and real-time of the virtual reality. The system is timely published, scalable and is capable of supporting remote deployment and distribution. The goal is to provide a reliable and effective real scene information dissemination and presentation of the real scene platforms based on the virtual reality environment. © Springer-Verlag Berlin Heidelberg 2014.

关键词： virtual reality

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