基于消散粒子系统的三维云实时动态模拟方法  

Simulation of 3D Realistic Cloud Scenes Based on Dissipation Particle System

作　　者：谢永华[1] 李平 寇小勇 XIE Yong-hua;LI Ping;KOU Xiao-yong(College of Computer and Software,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学计算机与软件学院

出　　处：《小型微型计算机系统》2019年第11期2466-2470,共5页Journal of Chinese Computer Systems

基　　金：国家自然科学基金项目(41675155)资助

摘　　要：针对目前云模拟建模过程单一,缺乏真实感,内存占用量大等缺点,提出了一种基于消散粒子系统的云动态模拟方法.该方法在建模阶段引入三维云消散函数,通过粒子系统模拟生成的云团,根据对三维云的不透明度以及粒子位置进行消散函数计算,从而实现三维云消散效果的动态模拟.在光线投射算法中通过根据云粒子分布状态属性改变采样点步长,降低内存的消耗、减少三维云场景的绘制时间.实验结果验证了本文方法能实时模拟云的生成和消散过程,获得真实感较强的云动态模拟效果.Aiming at the shortcomings of cloud simulation modeling process,lack of realism and large memory consumption,a cloud dynamic simulation method based on dissipative particle system is proposed. The method introduces a three-dimensional cloud dissipative function in the modeling stage,and the cloud group is simulated by the particle system,and the dissipative function is calculated according to the opacity of the three-dimensional cloud and the particle position,thereby realizing the dynamic simulation of the three-dimensional cloud dissipating effect. In the ray casting algorithm,the sampling point step size is changed according to the cloud particle distribution state,thereby reducing the memory consumption and the drawing time of the three-dimensional cloud scene. The experimental results verify that the proposed method can simulate the generation and dissipation process of the cloud in real time,and obtain the dynamic simulation effect of the cloud with strong realism.

关 键 词：粒子系统 消散函数 八叉树 多层次细节 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]