Fast character modeling with sketch-based PDE surfaces |
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Authors: | You Lihua Yang Xiaosong Pan Junjun Lee Tong-Yee Bian Shaojun Qian Kun Habib Zulfiqar Sargano Allah Bux Kazmi Ismail Zhang Jian J |
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Affiliation: | 1.National Centre for Computer Animation, Bournemouth University, Fern Barrow, Wallisdown, Poole, BH12 5BB, UK ;2.State Key Lab of VR, Beihang University, 37 Xueyuan Road, Haidian District, Beijing, 100083, People’s Republic of China ;3.National Cheng Kung University, East District, Tainan City, Taiwan, 701 ;4.King’s College London, Strand, London, WC2R 2LS, UK ;5.COMSATS University Islamabad, Lahore, Pakistan ;6.Teesside University, Campus Heart, Southfield Rd, Middlesbrough, TS1 3BX, UK ; |
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Abstract: | Virtual characters are 3D geometric models of characters. They have a lot of applications in multimedia. In this paper, we propose a new physics-based deformation method and efficient character modelling framework for creation of detailed 3D virtual character models. Our proposed physics-based deformation method uses PDE surfaces. Here PDE is the abbreviation of Partial Differential Equation, and PDE surfaces are defined as sculpting force-driven shape representations of interpolation surfaces. Interpolation surfaces are obtained by interpolating key cross-section profile curves and the sculpting force-driven shape representation uses an analytical solution to a vector-valued partial differential equation involving sculpting forces to quickly obtain deformed shapes. Our proposed character modelling framework consists of global modeling and local modeling. The global modeling is also called model building, which is a process of creating a whole character model quickly with sketch-guided and template-based modeling techniques. The local modeling produces local details efficiently to improve the realism of the created character model with four shape manipulation techniques. The sketch-guided global modeling generates a character model from three different levels of sketched profile curves called primary, secondary and key cross-section curves in three orthographic views. The template-based global modeling obtains a new character model by deforming a template model to match the three different levels of profile curves. Four shape manipulation techniques for local modeling are investigated and integrated into the new modelling framework. They include: partial differential equation-based shape manipulation, generalized elliptic curve-driven shape manipulation, sketch assisted shape manipulation, and template-based shape manipulation. These new local modeling techniques have both global and local shape control functions and are efficient in local shape manipulation. The final character models are represented with a collection of surfaces, which are modeled with two types of geometric entities: generalized elliptic curves (GECs) and partial differential equation-based surfaces. Our experiments indicate that the proposed modeling approach can build detailed and realistic character models easily and quickly. |
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