本文選題：移動(dòng)終端 + 三維模型　； 參考：《北京工商大學(xué)》2016年碩士論文

【摘要】：隨著計(jì)算機(jī)技術(shù)的快速發(fā)展以及三維建模技術(shù)的日益成熟,三維模型逐漸成為繼聲音、圖像和視頻之后的第四代多媒體數(shù)據(jù)類型。在三維模型迅猛增長(zhǎng)的同時(shí),當(dāng)前的智能手機(jī)、平板電腦的硬件性能提高極快,人們對(duì)移動(dòng)終端的圖形交互體驗(yàn)有了更多的需求,三維場(chǎng)景的廣泛應(yīng)用也由PC端開始轉(zhuǎn)向移動(dòng)終端設(shè)備。但與高端的圖形工作站和桌面PC相比,移動(dòng)終端的各種資源極為有限,三維模型的顯示效率有待提高。對(duì)于三維模型在移動(dòng)終端的顯示來說,為了得到逼真的顯示效果,視景中往往有上萬個(gè)多邊形,有時(shí)多達(dá)幾百萬個(gè)多邊形,這就對(duì)實(shí)時(shí)顯示提出了很高的要求。因此,對(duì)于三維模型在移動(dòng)終端存在的顯示問題,降低場(chǎng)景的復(fù)雜度也就成了實(shí)現(xiàn)實(shí)時(shí)顯示的關(guān)鍵。傳統(tǒng)的降低場(chǎng)景復(fù)雜度的方法主要有基于場(chǎng)景分塊的分割方法、基于可見性消隱的面片剔除方法和基于細(xì)節(jié)層次模型的顯示策略。但是,這些方法都不能有效的解決移動(dòng)資源的占用問題,基于細(xì)節(jié)層次模型的方法還大大的提高了內(nèi)存開銷,所以不適合應(yīng)用在移動(dòng)終端中。因此,本文針對(duì)上述問題展開研究,提出了一個(gè)基于圖形分類樹的三維模型面片生成方法。依據(jù)模型的數(shù)據(jù)庫(kù)表示形式,抽取其必要的類型和圖形信息,將三維模型用圖形分類樹表示;對(duì)交互選擇的分類樹節(jié)點(diǎn),使用基于離差標(biāo)準(zhǔn)化的方法估算所選節(jié)點(diǎn)的模型規(guī)模系數(shù);依據(jù)規(guī)模系數(shù)確定模型的顯示精度,以此進(jìn)行三維模型面片的生成。除此之外,針對(duì)移動(dòng)終端的交互和顯示特性,根據(jù)三維模型瀏覽的實(shí)際需求,設(shè)計(jì)并定義了多種多點(diǎn)觸控交互手勢(shì)以支持三維模型的瀏覽。綜合上述內(nèi)容,本文設(shè)計(jì)并實(shí)現(xiàn)了一個(gè)移動(dòng)終端三維模型快速顯示系統(tǒng),能夠快速選擇模型節(jié)點(diǎn),實(shí)現(xiàn)模型的顯示和交互瀏覽,已用于流程工廠模型的漫游以及三維校審。系統(tǒng)的顯示效果證明了算法的可行性和有效性。
[Abstract]:With the rapid development of computer technology and the maturity of 3D modeling technology, 3D model has gradually become the fourth generation multimedia data type after sound, image and video. With the rapid growth of 3D models, the hardware performance of current smartphones and tablets has improved rapidly, and people have more demand for the interactive experience of mobile terminals. The wide application of three-dimensional scene is also from PC to mobile terminal equipment. However, compared with high-end graphics workstations and desktop PCs, the resources of mobile terminals are very limited, and the display efficiency of 3D models needs to be improved. For the display of 3D model in mobile terminal, in order to obtain realistic display effect, there are often tens of thousands of polygons in the scene, sometimes as many as millions of polygons, which put forward a very high demand for real-time display. Therefore, for the display problem of 3D model in mobile terminal, reducing the complexity of scene becomes the key to realize real-time display. The traditional methods to reduce the complexity of the scene mainly include the segmentation method based on scene partitioning, the slice removal method based on visibility elimination and the display strategy based on detail hierarchy model. However, these methods can not effectively solve the problem of mobile resource occupancy. The method based on detail hierarchy model also greatly increases the memory overhead, so it is not suitable for mobile terminals. Therefore, in order to solve the above problems, this paper presents a method of creating 3D model surface based on graph classification tree. According to the database representation of the model, the necessary type and graph information are extracted, and the 3D model is represented by the graph classification tree. The method based on deviation standardization is used to estimate the model size coefficient of the selected node, and the display accuracy of the model is determined according to the scale coefficient, which is used to generate the 3D model surface. In addition, in view of the interactive and display characteristics of mobile terminals, according to the actual needs of 3D model browsing, a variety of multi-touch interactive gestures are designed and defined to support the browsing of 3D models. Based on the above, this paper designs and implements a mobile terminal 3D model fast display system, which can quickly select model nodes and realize model display and interactive browsing. It has been used for roaming of process factory model and 3D review. The display effect of the system proves the feasibility and effectiveness of the algorithm.
【學(xué)位授予單位】：北京工商大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TP391.41

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