基于WebGL的EAST可视化系统

发布时间：2018-02-24 09:33

本文关键词： EAST WebGL Three.js WebVR HTML5 虚拟现实　出处：《中国科学技术大学》2017年博士论文　论文类型：学位论文

【摘要】：随着虚拟现实技术的快速发展,基于Internet的Web3D技术不仅在教育、旅游、房地产等行业得到了广泛的应用,在国际核聚变装置如ITER、DIII-D、Alcator C-Mod等都发挥着重要的作用。EAST作为中国的大科学装置,不易接近,包含复杂的诊断测量系统,因此我们建立了基于VRML和Java3D的虚拟EAST系统,结合虚拟现实技术使用户不需要到现场便可以在EAST装置内漫游。随着EAST装置不断的升级改造和EAST实验数据被越来越多的国际合作者共享和分析,原有的系统因安装配置复杂、模型简单以及与实验数据库连接不完善等原因越来越无法满足科学研究人员的需求。因此,我们重新建立了零插件、跨平台的基于WebGL的EAST可视化系统。该系统的建立使得EAST科学研究人员能够更加快速全面的了解EAST装置内外部结构以及获取EAST实验数据,对EAST实验的进行和研究具有重要的意义。基于WebGL的可视化系统的关键实现技术是WebGL库文件Three.js、HTML5以及WebVR API。该系统的建立主要包括虚拟场景的构建,场景的交互控制,实验数据的可视化显示和场景的沉浸式体验。构建虚拟场景的前提是模型,模型的大小和质量决定了最终在网页上的加载速度和渲染效果,因此我们对建立的模型进行不同程度的优化以实现模型精度与渲染速度的平衡。场景的交互控制主要包括模型的旋转、缩放、拾取以及信息的显示。实验数据的可视化主要实现与实验数据库的连接,显示数据波形图、放电视频以及等离子体位型、粒子轨道等数据可视化。最后,我们调用WebVR API实现系统的沉浸式体验。为了方便管理员收集和管理信息与模型,我们分别建立了 EAST wiki系统和Web模型编辑器。EAST wiki系统用于EAST装置以及诊断测量系统的信息收集与显示,Web模型编辑器用于模型的导入导出、模型的编辑以及模型的上传。最终建立的基于WebGL的可视化系统是一个沉浸感强、界面友好的开放性综合平台。用户通过Web浏览器便可以浏览EAST装置模型,获取诊断测量部件的工程物理参数以及通过对应的信号名获取EAST实验数据的可视化显示。通过头戴式显示器可以增强用户的沉浸感和VR体验。本文的创新点如下:(1)搭建了零插件、跨平台的综合系统,提供了 EAST装置模型、工程物理参数以及EAST实验数据访问的统一入口。(2)建立模型的在线编辑器,实现模型的自动化导入。用户可以通过可视化的方式在Web浏览器上编辑模型并上传,实现模型的自动化处理。(3)建立开放式的信息管理平台——EAST wiki系统,提供多人共享,协作编辑的方式实现EAST相关信息的收集与管理,具有完善的权限管理和历史版本的控制。(4)细节层次模型加载的研究,利用LOD(Level of Detail)原理,在模型场景中只加载简化后的模型,进一步获取模型部件时显示部件的详细模型。实现模型加载速度与模型精度的平衡。(5)研究WebVR技术,实现EAST装置虚拟场景的VR体验。
[Abstract]:With the rapid development of virtual reality technology, Web3D technology based on Internet has not only been widely used in education, tourism, real estate and other industries. It plays an important role in international nuclear fusion devices such as ITER-DIII-DU Alcator C-Mod. As a large scientific device in China, East is not easy to access and contains complex diagnostic and measurement systems. Therefore, we have established a virtual EAST system based on VRML and Java3D. With the combination of virtual reality technology, users can roam in EAST devices without the need to go to the field. With the continuous upgrading of EAST devices and the sharing and analysis of EAST experimental data by more and more international partners, the original system is complicated because of installation and configuration. Because the model is simple and the connection to the experimental database is not perfect enough to meet the needs of scientific researchers, we have re-established the zero plug-in. A cross-platform EAST visualization system based on WebGL. The establishment of the system enables EAST scientific researchers to quickly and comprehensively understand the internal and external structure of EAST devices and obtain EAST experimental data. The key technologies of the visualization system based on WebGL are the WebGL library file Three.jsNHTML5 and the WebVR API. The establishment of the system mainly includes the construction of virtual scene and the interactive control of scene. Visual display of experimental data and immersive experience of scene. The premise of constructing virtual scene is the model. The size and quality of the model determine the final loading speed and rendering effect on the web page. So we optimize the model in different degrees to achieve the balance between model precision and rendering speed. The interactive control of the scene mainly includes the rotation, scaling and scaling of the model. The visualization of the experimental data mainly realizes the connection with the experimental database, displays the data waveform diagram, the discharge video, the plasma potential type, the particle orbit, and so on. Finally, We call WebVR API to implement the immersive experience of the system. We set up EAST wiki system and Web model editor .East wiki system to collect and display information for EAST device and diagnostic measurement system respectively. Finally, the visualization system based on WebGL is an open and comprehensive platform with strong immersion and friendly interface. Users can browse the model of EAST device through Web browser. To obtain the engineering physical parameters of diagnostic measuring parts and to obtain visual display of EAST experimental data by corresponding signal names. The immersion and VR experience of users can be enhanced by headset display. The innovations of this paper are as follows. A zero plug-in is built. A cross-platform integrated system that provides an online editor for EAST device models, engineering physical parameters, and unified access to EAST experimental data. The user can edit and upload the model on Web browser by visual way, and realize the automatic processing of model. (3) establish an open information management platform-East wiki system, which can be shared by many people. The method of collaborative editing realizes the collection and management of EAST related information. It has perfect privilege management and historical version control. The detail level model loading is studied. Using the principle of LOD(Level of detail, the simplified model is only loaded in the model scene. The balance between model loading speed and model precision is achieved. WebVR technology is studied to realize VR experience in virtual scene of EAST device.
【学位授予单位】：中国科学技术大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TL631.24;TP391.9

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