發(fā)布時間：2018-02-24 09:33

  本文關鍵詞： EAST WebGL Three.js WebVR HTML5 虛擬現(xiàn)實　出處：《中國科學技術大學》2017年博士論文　論文類型：學位論文

【摘要】：隨著虛擬現(xiàn)實技術的快速發(fā)展,基于Internet的Web3D技術不僅在教育、旅游、房地產(chǎn)等行業(yè)得到了廣泛的應用,在國際核聚變裝置如ITER、DIII-D、Alcator C-Mod等都發(fā)揮著重要的作用。EAST作為中國的大科學裝置,不易接近,包含復雜的診斷測量系統(tǒng),因此我們建立了基于VRML和Java3D的虛擬EAST系統(tǒng),結(jié)合虛擬現(xiàn)實技術使用戶不需要到現(xiàn)場便可以在EAST裝置內(nèi)漫游。隨著EAST裝置不斷的升級改造和EAST實驗數(shù)據(jù)被越來越多的國際合作者共享和分析,原有的系統(tǒng)因安裝配置復雜、模型簡單以及與實驗數(shù)據(jù)庫連接不完善等原因越來越無法滿足科學研究人員的需求。因此,我們重新建立了零插件、跨平臺的基于WebGL的EAST可視化系統(tǒng)。該系統(tǒng)的建立使得EAST科學研究人員能夠更加快速全面的了解EAST裝置內(nèi)外部結(jié)構(gòu)以及獲取EAST實驗數(shù)據(jù),對EAST實驗的進行和研究具有重要的意義�；赪ebGL的可視化系統(tǒng)的關鍵實現(xiàn)技術是WebGL庫文件Three.js、HTML5以及WebVR API。該系統(tǒng)的建立主要包括虛擬場景的構(gòu)建,場景的交互控制,實驗數(shù)據(jù)的可視化顯示和場景的沉浸式體驗。構(gòu)建虛擬場景的前提是模型,模型的大小和質(zhì)量決定了最終在網(wǎng)頁上的加載速度和渲染效果,因此我們對建立的模型進行不同程度的優(yōu)化以實現(xiàn)模型精度與渲染速度的平衡。場景的交互控制主要包括模型的旋轉(zhuǎn)、縮放、拾取以及信息的顯示。實驗數(shù)據(jù)的可視化主要實現(xiàn)與實驗數(shù)據(jù)庫的連接,顯示數(shù)據(jù)波形圖、放電視頻以及等離子體位型、粒子軌道等數(shù)據(jù)可視化。最后,我們調(diào)用WebVR API實現(xiàn)系統(tǒng)的沉浸式體驗。為了方便管理員收集和管理信息與模型,我們分別建立了 EAST wiki系統(tǒng)和Web模型編輯器。EAST wiki系統(tǒng)用于EAST裝置以及診斷測量系統(tǒng)的信息收集與顯示,Web模型編輯器用于模型的導入導出、模型的編輯以及模型的上傳。最終建立的基于WebGL的可視化系統(tǒng)是一個沉浸感強、界面友好的開放性綜合平臺。用戶通過Web瀏覽器便可以瀏覽EAST裝置模型,獲取診斷測量部件的工程物理參數(shù)以及通過對應的信號名獲取EAST實驗數(shù)據(jù)的可視化顯示。通過頭戴式顯示器可以增強用戶的沉浸感和VR體驗。本文的創(chuàng)新點如下:(1)搭建了零插件、跨平臺的綜合系統(tǒng),提供了 EAST裝置模型、工程物理參數(shù)以及EAST實驗數(shù)據(jù)訪問的統(tǒng)一入口。(2)建立模型的在線編輯器,實現(xiàn)模型的自動化導入。用戶可以通過可視化的方式在Web瀏覽器上編輯模型并上傳,實現(xiàn)模型的自動化處理。(3)建立開放式的信息管理平臺——EAST wiki系統(tǒng),提供多人共享,協(xié)作編輯的方式實現(xiàn)EAST相關信息的收集與管理,具有完善的權(quán)限管理和歷史版本的控制。(4)細節(jié)層次模型加載的研究,利用LOD(Level of Detail)原理,在模型場景中只加載簡化后的模型,進一步獲取模型部件時顯示部件的詳細模型。實現(xiàn)模型加載速度與模型精度的平衡。(5)研究WebVR技術,實現(xiàn)EAST裝置虛擬場景的VR體驗。
[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.
【學位授予單位】：中國科學技術大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：TL631.24;TP391.9

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本文編號：1529748