一种卡通动画中人物头发运动生成技术研究

Research of human hair animation generation technology in cartoon

介绍了一种新的卡通动画中人物头发运动的混合技术,使动画师们能方便地创作出有吸引力和可控性的头发运动效果,而不需要手工对头发运动表现过程进行逐帧绘制,仅设置好所需的一些关键帧画面。该技术方法演示如何根据给出的手绘卡通人物角色动作配以相应的头发运动效果。这种方法的新颖之处是,既不是简单地插入关键帧来获得头发运动效果,也不是通过物理模拟的方式来生成头发飘逸的动画,而是从动画师预先准备好的少量的作为关键帧草图的头发运动效果,建立物理模拟动画数据库,根据此数据库中头发的运动效果来创建出特定头发运动动画。此方法生成的头发动画分两个阶段完成,首先是在数据库中搜索对应的运动效果画面,然后顺利连接;其次数据库序列的关键帧之间的过渡帧由在动画中运用转移函数生成的插值补充,以实现流畅的头发飘逸动画。

This paper introduces a new hybrid technique for human hair animation in cartoon , which allows the animators to create attractive and controllable hair animations without having to draw everything by hand except a sparse set of keyframes. This method demonstrates how to give a cel-animation character accentuated hair motion. The novelty of this approach is that we neither simply interpolate the key frames nor generate the movement of the hair only using physical simulations. From a small number of rough sketches we prepare key frames that are used as indicators of hair motion. The hair movements are created based on a hair motion database built from physical simulations custom-designed by the animator. Hair animations with constraints from the key frames can be generated in two stages： a matching process to search for the desired motion sequences from the database and then smoothly connect them; the discrepancies between the database sequences and the key frames are interpolated throughout the animation using transition function.