基于复杂外力与数据驱动的树木运动学模型构建

Construction of tree kinematic model based on complex external forces and data driving

针对当前模型在表现树木各分支对象摆动、断裂等形态方面效果较差的问题,提出了基于运动学模型的树木动态建模方法.根据自然界中的复杂外力与重力之间的合力关系,获得各分支对象在碰撞前的角度、速度等特征量;采用运动学原理获得撞击力,并分析其与断裂极限值之间的关系,从而描绘各分支对象在运动轨迹中与其他对象发生碰撞后,各对象的摆动、断裂等形态.实验模拟结果表明,采用基于运动学模型模拟出的效果,其树木运动姿态流畅逼真,实时代价小,模拟效果较好.

In order to solve the problem that current models are not effective in displaying the swing and fracture of tree branches,a tree dynamic modeling method based on a kinematic model was proposed.According to the resultant relationship between complex external forces and gravity,the angular and velocity characteristics of each branch object before collision were obtained.The kinematic principle was used to obtain the impact force,and the relationship between the impact force and the fracture limit values was analysed,so the swing or fracture of each branch object after the collision with other objects in trajectory could be described.After experimental simulation,the results show that the simulation based on kinematic model is smooth and realistic,with lower real-time cost and better simulation effect.