基于粒子数生成函数的烟雾模拟*

在大规模虚拟战场仿真和复杂环境仿真中，烟雾作为其中的重要组成部分，其模拟具有重要的意义。针对烟雾模拟中难以达到真实性和实时性平衡的问题，引入层次细节技术，减少了模拟中所需要的粒子数目，在满足视觉效果的前提下提高了实时性。引入改进的物理模型与粒子系统相结合，增强烟雾的细节，生成真实感较强的烟雾。此外，还利用烟气抬升高度的阈值控制法来判断粒子的生命情况，使烟雾的模拟更加真实。实验证明，本系统利用有限的粒子数生成了满足视觉真实性和视景系统实时性要求的烟雾场景。

Simulation of smoke based on number of particle created function

In simulation of large-scale virtual battlefield, smoke as an important part, its simulation is of great significance.It was difficult to balance the reality and the real-time in smoke simulation,proposed the level of detail, reducing the numbers of particle in simulation and improving the real-time. At the same time satisfied visual effect.Introduced combining physical model with particle system, added more detail of smoke and generated realistic smoke. Furthermore, imposed the method of threshold controll to judge if the particle should die, which made the simulation more realistic. Experiment testify that the system uses limited numbers of particle producing realistic and real-time smoke scene.