本文關(guān)鍵詞： 計(jì)算機(jī)輔助三維創(chuàng)意建模 虛擬生物建模 生物語法 實(shí)時(shí)分割 基于草圖的建模 三維制造 蒙皮 多姿態(tài)平衡分析　出處：《浙江大學(xué)》2016年博士論文　論文類型：學(xué)位論文

【摘要】：在三維影視特效及電子游戲中,三維角色模型是必不可少的部分。雖然現(xiàn)有大量的商業(yè)建模系統(tǒng),可以滿足各種建模需求,但這些系統(tǒng)非常復(fù)雜,難以掌握,更多地局限于專業(yè)人員使用。過去十幾年里,圖形學(xué)界在簡(jiǎn)單易用且功能強(qiáng)大的建模技術(shù)方面進(jìn)行了大量研究,提出了草圖式建模、組合式建模等方法,取得了重大進(jìn)展�？傮w來看,現(xiàn)有的建模技術(shù)更多地將三維建模視為工藝過程,即在建模之前有明確的目標(biāo)。然而,三維建模也是個(gè)開放式的藝術(shù)創(chuàng)作過程,其建模目標(biāo)會(huì)經(jīng)常發(fā)生不可預(yù)知的改變。顯然,現(xiàn)有的建模技術(shù)不適用于開放式建模。因此,如何在開放式建模過程中提供創(chuàng)意支持以輔助用戶更好地創(chuàng)作在三維建模中具有重要的理論研究意義與實(shí)際應(yīng)用價(jià)值。其中一類計(jì)算機(jī)輔助三維創(chuàng)意建模技術(shù)向用戶建議可添加到當(dāng)前模型的部件。然而,這類技術(shù)都依賴預(yù)分割(或標(biāo)記)的模型數(shù)據(jù)庫(kù)。用戶僅可使用預(yù)分割的部件組合模型。這極大地限制了建�？臻g與用戶的創(chuàng)造力。另一類是模型建議技術(shù)。這類技術(shù)更適合處理具有相同結(jié)構(gòu)的同類模型,產(chǎn)生的是與輸入具有相同結(jié)構(gòu)的同類模型。其最大缺點(diǎn)是不適合產(chǎn)生拓?fù)浣Y(jié)構(gòu)變異的模型。此外,在計(jì)算機(jī)動(dòng)畫中,建模僅是第一步,接下來還要編輯動(dòng)畫甚至三維打印制造實(shí)物。編輯動(dòng)畫之前需要蒙皮。三維打印之前需要經(jīng)過很多處理,比如,平衡性分析,關(guān)節(jié)優(yōu)化等。然而,現(xiàn)有的計(jì)算機(jī)輔助三維創(chuàng)意建模系統(tǒng)往往局限于建模。簡(jiǎn)單地將蒙皮與面向三維打印的模型處理做為建模的后續(xù)處理步驟無法達(dá)到實(shí)時(shí)交互。因?yàn)?"建模-蒙皮-面向三維打印的模型處理"是個(gè)迭代的步驟,簡(jiǎn)單組合現(xiàn)有技術(shù)會(huì)導(dǎo)致用戶在不同工具間頻繁變換,降低效率。本文針對(duì)現(xiàn)有計(jì)算機(jī)輔助三維創(chuàng)意建模技術(shù)不適合產(chǎn)生拓?fù)浣Y(jié)構(gòu)變異,依賴預(yù)分割的模型數(shù)據(jù)庫(kù)限制建�？臻g,缺少蒙皮及面向三維打印的模型處理三方面的問題,進(jìn)行了深入研究與探索,提出了一系列新技術(shù)新方法,在實(shí)際應(yīng)用與理論研究上取得重大突破。本文主要研究?jī)?nèi)容如下:·提出一種輔助用戶快速建模大量虛擬生物的技術(shù)。這些虛擬生物具有合理的奇異的拓?fù)浣Y(jié)構(gòu)。用戶從數(shù)據(jù)庫(kù)內(nèi)選擇若干個(gè)不同類的常規(guī)模型,我們的技術(shù)迭代地產(chǎn)生一代代結(jié)構(gòu)奇異的虛擬生物模型做為建議提示給用戶,以激發(fā)靈感。我們方法的核心是生物語法(Creature grammar)。生物語法是針對(duì)建模虛擬生物特化的形狀語法(Shape grammar)。生物語法改變部件的排列方式與數(shù)目,同時(shí)保持生物的語義約束�！ぬ岢鲆环N基于草圖的按需部件建議方法—SketCh2Cut系統(tǒng)。用戶輸入草圖表達(dá)設(shè)計(jì)概念,我們的方法依此生成三維代理部件并從數(shù)據(jù)庫(kù)內(nèi)搜索出一系列候選部件,提示給用戶。我們的方法首先將三維模型局部匹配問題轉(zhuǎn)化為多視角下的二維輪廓局部匹配。然后基于三維模型的超面片圖表示,快速地從三維模型上提取與用戶意圖匹配的三維部件,提取過程由粗到細(xì),邊界逐步優(yōu)化。與以前的工作不同,我們的方法不依賴預(yù)分割的三維模型數(shù)據(jù)庫(kù),并可以建議定制的任意部件,極大地?cái)U(kuò)展了用戶設(shè)計(jì)空間�！ぬ岢鲆粋�(gè)統(tǒng)一的框架,將建模、蒙皮與面向三維打印的模型處理無縫地融合到一起。輸入一組蒙皮的三維模型,我們的系統(tǒng)迭代地產(chǎn)生一代代新模型,做為建議提示給用戶以激發(fā)靈感。用戶選擇感興趣的模型用于動(dòng)畫編輯與三維打印分析。我們的方法首先融合部件表面及其骨架,然后快速更新融合模型的蒙皮權(quán)重,接著采用面向三維打印的骨架優(yōu)化算法選擇出最優(yōu)關(guān)節(jié)位置與半徑,最后優(yōu)化模型內(nèi)部質(zhì)量分布,確保模型在不同姿勢(shì)下保持平衡。通過將建模、蒙皮與面向三維打印的模型處理集成至統(tǒng)一的框架,我們的方法更好地輔助了用戶的創(chuàng)新性建模過程。
[Abstract]:In 3D video effects and computer games, 3D role model is an essential part. Although a large number of existing commercial modeling system, can meet the modeling requirements, but these systems are very complex, difficult to grasp, more limited to professional use. Over the past ten years, made a lot of research in the field of graphics easy to use and powerful modeling techniques, presents a sketch of Shi Jianmo, combined modeling method, has made significant progress. Overall, the modeling technology of 3D modeling more as a process, which has clear objectives before modeling. However, 3D modeling is an open-ended process of artistic creation, its modeling the target is often unpredictable change. Obviously, the modeling technology is not suitable for open modeling. Therefore, how to provide creative support in open modeling process In order to assist users to better the creation of research has important theoretical significance and practical value in 3D modeling. One kind of computer aided 3D modeling technology to the user creative suggestions added to the current model of the part. However, this kind of technology is dependent on the pre segmentation (or mark) of the model database. Users can only model components the use of pre segmentation. This greatly limits the modeling space and user creativity. Another is the model suggested technology. This kind of technology is more suitable for the treatment of similar model with the same structure, the same model has the same structure and input. Its biggest disadvantage is not suitable for generating topological variation in addition model. In computer animation, modeling, is only the first step, then also edit animation and even 3D printing manufacturing objects. Editing animation is needed before skin. 3D printing is needed before the A lot of processing, for example, balance analysis, joint optimization. However, 3D creative modeling system is often limited to modeling the existing computer. Simply the skin and oriented 3D printing processing model for subsequent processing steps of modeling can not achieve real-time interaction. For modeling - skin - oriented 3D printing model processing is an iterative procedure, a simple combination of existing technology will lead the user to reduce efficiency between different tools. Frequent transform, aiming at the existing computer aided 3D modeling technology is not suitable to produce creative topology variation, dependent model database pre segmentation modeling space, lack of skin and oriented 3D printing model three the problem, in-depth research and exploration, put forward a series of new methods and new technologies, has made a major breakthrough in the practical application and theoretical research in this paper. The research contents are as follows: - provide a user assisted rapid modeling of a large number of virtual biological technology. The virtual life with strange topology structure reasonable. Users choose several different from the conventional model database, as suggestions to prompt the user to generate iterative virtual biology model generation structure of strange US. To inspire. The core of our approach is the biological Grammar (Creature grammar). The biological grammar is the shape grammar modeling virtual biological specialization (Shape grammar). The biological syntax changes the arrangement and the number of components, while maintaining the semantic constraints of organisms. And presents a sketch of the required components suggest method - SketCh2Cut system based on user input sketch expression design concept, and our method of generating 3D agent components and search out a series of candidate parts from the database, to prompt the use Our method first. The 3D model partial matching problem is transformed into the 2D contour under multi angle and local matching. Then hyperpatch diagram based on 3D model representation, quickly from the three-dimensional model of 3D intention extraction components matching with the user, the extraction process from coarse to fine, and gradually optimize the boundary. Unlike the previous work our method does not rely on the database, 3D model segmentation, and can be customized components suggest, greatly expand the user design space. We propose a unified framework for modeling, covering and oriented 3D printing model seamlessly together. A 3D model group covering input system iteration a new model of our real estate from generation to generation, as suggestions to prompt the user to inspire. Interest model is used to analyze the animation editing and 3D print users. First we method The fusion component surface and skeleton, and then quickly update the skin weights fusion model, then used for 3D printing frame optimization algorithm to select the optimal joint position and radius, finally optimize the quality distribution inside the model to ensure the model balance in different positions. By modeling, the skin and the oriented 3D printing processing integration to unified model the framework, our method better aided innovative user modeling process.

【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TP391.41

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1 郭雪昆;計(jì)算機(jī)輔助三維創(chuàng)意建模技術(shù)[D];浙江大學(xué);2016年

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本文編號(hào)：1458150