【作者】 车武军； 杨勋年； 汪国昭；

【Author】 Che Wujun Yang Xunnian Wang Guozhao (Department of Mathematics Institute of computer graphics and image processing Zhejiang University Hangzhou 310027)

【机构】 浙江大学数学系 浙江大学计算机图像图形研究所；

【摘要】 变形技术由于在动画、工业设计等领域广泛应用,近十多年来倍受关注。本文根据多边形内在量插值的思想给出了一个新颖的二维形状插值算法。该算法以平面对象的骨架模型为基础,由源物体骨架向目标物体骨架变动来驱动两者距离场的光滑过渡。为了指导骨架的变动顺利完成,我们引入骨架特征图的概念;当源物体与目标物体拓扑结构不一致时,特征图会根据特征顶点的对应函数(由用户定义)自动扩充为具有相同结构的扩展特征图;然后我们采用内在量的方法,通过对扩展特征图内的特征三角形集实现对源物体骨架与目标物体骨架的扩展特征图的光滑变形,从而转化为骨架的变形。本文方法的优点在于源物体与目标物体的结构可以完全不一样,但特征点的对应关系仍需由用户指定。更多还原

【Abstract】 Morphing has received much attention in recent years because of its wide application to computer animation and industrial design.We present a novel algorithm for 2-D shape interpolation according to intrinsic shape parameters of polygonal shape.We compute the skeletons of the given shapes and the smooth transform of distance field is driven by metamorphosis from the skeleton of the source object to that of the target one.In the presented method we introduce feature graph of skeleton to guide the construction of intermediate skeleton.When the topology of me source object and mat of the target one are different,their feature graphs will be automatically extended to topologically equivalent extended feature graphs.Then we apply the technique of intrinsic shape parameters to the smooth transition of me extended feature graphs by the set of feature triangle,which will guide the metamorphosis of the skeletons.The advantage of the new approach is that it is capable of morphing between objects having a different topological genus,but the desired correspondence of feature vertex must be defined by an animator.更多还原