本文關(guān)鍵詞： EAST WebGL Three.js WebVR HTML5 虛擬現(xiàn)實(shí)　出處：《中國(guó)科學(xué)技術(shù)大學(xué)》2017年博士論文　論文類型：學(xué)位論文

【摘要】：隨著虛擬現(xiàn)實(shí)技術(shù)的快速發(fā)展,基于Internet的Web3D技術(shù)不僅在教育、旅游、房地產(chǎn)等行業(yè)得到了廣泛的應(yīng)用,在國(guó)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(guó)的大科學(xué)裝置,不易接近,包含復(fù)雜的診斷測(cè)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(shí)技術(shù)使用戶不需要到現(xiàn)場(chǎng)便可以在EAST裝置內(nèi)漫游。隨著EAST裝置不斷的升級(jí)改造和EAST實(shí)驗(yàn)數(shù)據(jù)被越來(lái)越多的國(guó)際合作者共享和分析,原有的系統(tǒng)因安裝配置復(fù)雜、模型簡(jiǎn)單以及與實(shí)驗(yàn)數(shù)據(jù)庫(kù)連接不完善等原因越來(lái)越無(wú)法滿足科學(xué)研究人員的需求。因此,我們重新建立了零插件、跨平臺(tái)的基于WebGL的EAST可視化系統(tǒng)。該系統(tǒng)的建立使得EAST科學(xué)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(shí)驗(yàn)數(shù)據(jù),對(duì)EAST實(shí)驗(yàn)的進(jìn)行和研究具有重要的意義�；赪ebGL的可視化系統(tǒng)的關(guān)鍵實(shí)現(xiàn)技術(shù)是WebGL庫(kù)文件Three.js、HTML5以及WebVR API。該系統(tǒng)的建立主要包括虛擬場(chǎng)景的構(gòu)建,場(chǎng)景的交互控制,實(shí)驗(yàn)數(shù)據(jù)的可視化顯示和場(chǎng)景的沉浸式體驗(yàn)。構(gòu)建虛擬場(chǎng)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(yè)上的加載速度和渲染效果,因此我們對(duì)建立的模型進(jìn)行不同程度的優(yōu)化以實(shí)現(xiàn)模型精度與渲染速度的平衡。場(chǎng)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(shí)驗(yàn)數(shù)據(jù)的可視化主要實(shí)現(xiàn)與實(shí)驗(yàn)數(shù)據(jù)庫(kù)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(shí)現(xiàn)系統(tǒng)的沉浸式體驗(yàn)。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(cè)量系統(tǒng)的信息收集與顯示,Web模型編輯器用于模型的導(dǎo)入導(dǎo)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(gè)沉浸感強(qiáng)、界面友好的開(kāi)放性綜合平臺(tái)。用戶通過(guò)Web瀏覽器便可以瀏覽EAST裝置模型,獲取診斷測(cè)量部件的工程物理參數(shù)以及通過(guò)對(duì)應(yīng)的信號(hào)名獲取EAST實(shí)驗(yàn)數(shù)據(jù)的可視化顯示。通過(guò)頭戴式顯示器可以增強(qiáng)用戶的沉浸感和VR體驗(yàn)。本文的創(chuàng)新點(diǎn)如下:(1)搭建了零插件、跨平臺(tái)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(shí)驗(yàn)數(shù)據(jù)訪問(wèn)的統(tǒng)一入口。(2)建立模型的在線編輯器,實(shí)現(xiàn)模型的自動(dòng)化導(dǎo)入。用戶可以通過(guò)可視化的方式在Web瀏覽器上編輯模型并上傳,實(shí)現(xiàn)模型的自動(dòng)化處理。(3)建立開(kāi)放式的信息管理平臺(tái)——EAST wiki系統(tǒng),提供多人共享,協(xié)作編輯的方式實(shí)現(xiàn)EAST相關(guān)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(xì)節(jié)層次模型加載的研究,利用LOD(Level of Detail)原理,在模型場(chǎng)景中只加載簡(jiǎn)化后的模型,進(jìn)一步獲取模型部件時(shí)顯示部件的詳細(xì)模型。實(shí)現(xiàn)模型加載速度與模型精度的平衡。(5)研究WebVR技術(shù),實(shí)現(xiàn)EAST裝置虛擬場(chǎng)景的VR體驗(yàn)。
[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(xué)位授予單位】：中國(guó)科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：TL631.24;TP391.9

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