Abstract: Adding simulation of natural environment during simulation of train visual can enhance fidelity of visual effect. Simulation of train window in train driving can increase influence of vision which the environment produce for driving personnel, and enhance the effect of simulation in train simulator. This paper uses particles system and the way of OpenGL paste texture to simulate droplet of train window in rainy day. The wiper model joins in the scene through wiper and raindrops particles to cooperate, simulates the rain day environment window effect. The way under premise of satisfying realtime, enhances the sense of reality driving train in rainy day, and meets train drive simulation visual simulation needs.

Key words: particle system, wiper, window effect