列车运行视景仿真中雨雪的模拟

在建立降雨、降雪过程数学模型的基础上,设计了实时雨雪粒子系统.介绍了该粒子系统的实现方法,包括粒子属性的定义与更新、粒子生命周期控制等.在该系统中,通过控制粒子的可视区域,模拟隧道或车站对雨雪遮挡效果.用简化的物理模型实时计算粒子的空间位置,用公告牌技术绘制粒子.实际应用结果表明,该粒子系统能够在复杂的列车运行场景中实时地模拟雨雪现象.

Simulation of Rain and Snow in Visual Simulation of Train Operation

A simulation method for rain and snow in visual simulation of train operation was proposed.A real-time rain and snow particle system was designed based on the physical model of raining and snowing.The implement of the particle system was discussed,including the definition of particles,control of particle lifecycles,and so on.In the system,a visual area is defined to simulate the obstructing effect on the rain and snow particles by a tunnel or a railway station.Particle positions are calculated by a simplified dynamic model,and the billboard technique is employed to render particles.Application of the proposed method shows that the rain and snow particle system performs well for real-time rendering of complicated raining and snowing in visual simulation of train operation.