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计算机工程

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基于几何结构的2.5D卡通建模

刘 艳,胡艳宏,孙战利   

  1. (天津大学计算机科学与技术学院,天津300072)
  • 收稿日期:2014-05-20 出版日期:2015-05-15 发布日期:2015-05-15
  • 作者简介:刘 艳(1972 - ),女,副教授,主研方向:计算机图形学,虚拟现实,计算机动画;胡艳宏、孙战利,硕士研究生。

2. 5D Cartoon Modeling Based on Geometric Structure

LIU Yan,HU Yanhong,SUN Zhanli   

  1. (College of Computer Science and Technology,Tianjin University,Tianjin 300072,China)
  • Received:2014-05-20 Online:2015-05-15 Published:2015-05-15

摘要: 二维卡通制作技术大致分为计算机辅助2D 卡通动画制作和利用3D 建模技术渲染生成动画。将两者结 合,提出一种2. 5D 卡通制作模型,通过几何结构的旋转进行纹理贴图,并构造卡通的旋转过程。在2D 动画中,一 个卡通形象本身隐含几何结构,将卡通形象定义为由只含一个典型几何结构卡通元素构成的卡通对象,利用典型 几何结构二维投影变化规律,构建相应结构卡通元素的变形算法,分析长方体和球体卡通元素在转动时投影的变 化规律,给出基于这些规律实现相应结构卡通元素伪3D 转动效果的算法。通过长方体、球体、圆柱体进行旋转的 实验结果证明了算法的有效性。

关键词: 2. 5D 建模, 投影轮廓线, 纹理贴图, 投影, 卡通元素, 卡通对象

Abstract: Technologies of 2D cartoon animation can be roughly categorized into two types:one is computer-aided 2D cartoon animation,and the other is rendering 3D models. These two both have their own pros and cons. So this paper proposes a way which combines both of them,that is 2. 5D cartoon modelling method which constructs the rotation of the cartoon by texture mapping. In 2D animation,a character has an implicit geometry structure. So in this paper,it defines a character as a cartoon object composed of only one typical geometry structure. This paper builds the deformation algorithm of corresponding structure through the two dimensional projection transformation of typical geometries. Detailed analysis of projection transformation patterns of rectangular and sphere are provided. Based on patterns founded,this paper provides algorithm for implementing pseudo-3D rotation effects for the corresponding carton elements,and gives the results of cuboid,sphere and cylinder to support the validity of the algorithm.

Key words: 2.5D modeling, projected outline, texture mapping, projection, cartoon element, cartoon object

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