The motion characteristics of characters work as a breakthrough point,the different application of octree were designed in animated automatic generative system respectively:octree is used to simplify scene modeling for flying characters which don' t need to build scene modeling accurately. It is used to test intersection between models and detect collision in process of path searching for walking and crawling characters which demand high precision of scene modeling. Experiments results showed that the efficiency of scene modeling and path planning were improved and the complexity was simplified with octree. The methods could plan a more reasonable path for all kinds of characters. The results of planning path had more rationality and optimality.%以运动角色的动作特征为切入点,分别对动画自动生成系统中八叉树的不同应用进行设计:对场景模型精度要求不高的飞行角色,八叉树用于场景简化建模；对场景精度要求较高的行走和爬行类角色,八叉树用于测试物体模型间的相交测试及路径搜索中碰撞检测.试验结果表明,通过八叉树使用的不同提高了场景建模的效率和路径搜索的速度,简化了问题的复杂度,另外能够很好地为各类角色规划出合理路径,规划结果具有较好的完备性和最优性.
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