物质点法的物体断裂细节绘制算法优化  

Optimization of Object Fracture Detail Rendering Algorithm Based on Material Point Method

作　　者：赵静[1,2,3] 安泳钢 许立群 袁海鹏 唐川宁 唐勇[1,2,3] 冯莉 Zhao Jing;An Yonggang;Xu Liqun;Yuan Haipeng;Tang Chuanning;Tang Yong;Feng Li(The College of Information Science and Engineering,Yanshan University,Qinhuangdao 066004;The Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province,Qinhuangdao 066004;State Key Laboratory of Software Engineering of Hebei Province,Qinhuangdao 066004)

机构地区：[1]燕山大学信息科学与工程学院,秦皇岛066004 [2]河北省计算机虚拟技术与系统集成重点实验室,秦皇岛066004 [3]河北省软件工程国家重点实验室,秦皇岛066004

出　　处：《计算机辅助设计与图形学学报》2023年第6期839-847,共9页Journal of Computer-Aided Design & Computer Graphics

基　　金：国家自然科学基金(61902340);河北省自然科学基金(F2019203494);河北省创新能力提升计划(22567626H).

摘　　要：针对物体断裂仿真中因采样不均匀导致的断裂细节不真实问题,提出一种优化基于物质点法的断裂表面细节的方法.首先采用物质点法处理断裂过程中出现的大的拓扑变化,增强碰撞和断裂处理的效率,减少计算量;然后引入弹性与塑性之间的流动规则,解决物体断裂时屈服条件不稳定的问题,增强真实性;最后采用重采样方法处理产生的空洞区域,改进网格的划分方式,从而增加断裂面的细节,有效地体现断裂效果.实验结果表明,与现有的物质点法的物体断裂相比,所提方法在保证帧率、时间步长等相关参数稳定的前提下,填补了断裂空洞,能够在视觉上表现更加丰富的断裂面细节.Aiming at the unreal fracture details caused by uneven sampling in object fracture simulation,a method to optimize the fracture surface details based on material point method is proposed.Firstly,the material point method is used to deal with the large topological changes in the fracture process,so as to enhance the ef-ficiency of collision and fracture treatment and reduce the amount of calculation.Secondly,the flow rule be-tween elasticity and plasticity is introduced to solve the problem of unstable yield condition during object fracture and enhance the authenticity.Finally,the resampling method is used to deal with the cavity area and improve the meshing method,so as to increase the details of the fracture surface and effectively reflect the fracture effect.The experimental results show that compared with the existing material point method,the opti-mized object fracture method fills the fracture cavity and can visually show more abundant fracture surface details on the premise of ensuring the stability of relevant parameters such as frame rate and time step.

关 键 词：断裂仿真 物质点法 流动规则 重采样 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]