列车驾驶视景仿真中自然现象的模拟

Simulation of Natural View by Train Simulator

视景系统用于实现对列车操纵环境视觉上的模拟。在传统视景系统中,采用图象迭加的方式模拟雨、雪,效果较差,难以满足要求。将粒子系统应用于雨、雪等自然现象的模拟,针对列车驾驶视景仿真的特点,给出一种雨、雪的粒子系统模型,在三维场景中,实现了对降雨、降雪过程的仿真。该模型中,对雨、雪的物理模型进行了适当简化,能够满足视景仿真的实时性要求。实践表明,该粒子系统模型时间开销小,可在复杂的三维场景中实时地模拟雨、雪等自然现象,仿真效果逼真。

Train simulator is used in driver training for visual simulation of the operating environment. In the conventional visual system to simulate real environment of snow, rain and some other natural phenomenon, image overlay is used and the poor effect can not satisfy the actual demand. In this paper, a simulation model using particle system to simulate snow and rain is proposed. In this physical model, the simulation for snow and rain is simplified to satisfy the realtime requirement in visual simulation with 3D scene. The results show that the efficient model renders complicated realtime scenes and the effect can satisfy the reality demand of train simulator with vivid images.