一种新的三维实时红外尾焰仿真方法-红外技术.PDFVIP

第31 卷 第10 期 红 外 技 术 Vol.31 No.10 2009 年10 月 Infrared Technology Oct. 2009 一种新的三维实时红外尾焰仿真方法 于 洋，汤心溢，刘 鹏，高思莉 （中国科学院上海技术物理研究所，上海200083 ） 摘要：红外尾焰仿真是红外场景仿真的难点之一。采用粒子方法仿真红外尾焰存在二个问题，一是粒 子数量庞大，二是很难通过控制粒子实现尾焰的温度场分布。利用尾焰的对称性，提出了一种基于粒 子系统的改进算法，将尾焰拆分成横切面与底面二个几何平面，仅在平面内进行粒子填充。同时提出 了双层布告板旋转算法，分别旋转粒子与尾焰的切面，使得尾焰能适应不同的观察角度。实验证明， 本文算法能大幅度降低粒子数量，提高仿真速度。同时，对粒子的精确控制使得尾焰的温度场分布变 得可控，解决了以往基于粒子系统的尾焰仿真温度随机不可控的不足。 关键词：红外；尾焰；三维可视化仿真；粒子系统；双层布告板 中图分类号：TN216 文献标识码：A 文章编号：1001-8891(2009)10-0577-04 A New Way of Real-Time 3D Simulation of Infrared Plume YU Yang ，TANG Xin-yi ，LIU Peng，GAO Si-li (Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China) Abstract ：Infrared plume simulation is a difficult point in real-time scene generation. There are two problems when simulating infrared plume based on particle systems; one is the large amount of particles used, the other is the difficulty in controlling the temperature field. Taking the symmetrical property of a plume into consideration, we present an improved way of real-time simulation of infrared plume, which divides the plume into two surfaces--the longitudinal slice and the base, and fill particles only in these surfaces. Then we rotate the particles and the surfaces of the plume respectively to form a 3D plume which can be seen from any direction. The experiment proved that our algorithm can greatly reduce the number of particles used, thus it can enhance the simulation speed. At the same time, the careful disposition of particles can make