虚拟交通环境中的雨滴仿真

为实现虚拟交通场景中的降雨实时仿真，设计出一种基于OpenGL的降雨仿真模型。现有雨的仿真模型主要关注降雨过程，而在虚拟交通环境中，通常还需要对雨滴在挡风玻璃上的运动进行仿真。利用OpenGL将场景渲染到纹理，运用几何方法计算雨滴粒子并将其映射到网格化的虚拟挡风玻璃平面，采用贴纹理的方法将纹理映射到虚拟挡风玻璃平面，建立了雨滴在挡风玻璃平面的仿真模型。实践表明，该方法的时间开销与场景、光照等因素无关，仅与车辆挡风玻璃上的雨滴数量相关。该方法在普通PC实验平台上渲染场景的帧速率超过25帧／秒，能够成功实现雨滴的实时仿真。

Simulation of raindrops in virtual traffic environment

In order to realize real-time rainfall simulation in virtual traffic scene,this paper designed a rainfall simulation model based on OpenGL.Existing rain simulation methods mainly focused on rainfall process,but in virtual traffic environment,simulation movement of raindrops on windshield is needed.This paper rendered the scene to texture by OpenGL,computed raindrop particles through geometric methods and mapped them to meshes which generated by gridding virtual windshield plane,and adopted texture paste met...