虚拟环境中池塘雨景雪景的构造与绘制

虚拟环境中的池塘雨景、雪景能增强人在虚拟环境中的沉浸感.如何对雨滴、雪片的运动建模,以及怎样实现其在计算机上的动态模拟,是室外仿真领域需要解决的重要问题.在粒子系统中引入粒子的运动模型,通过修改运动模型中粒子质量、风速和风向等关键参数的取值,实现了在不同风吹动条件下雨滴、雪片随风飞舞的实时模拟;同时通过对雨滴、雪片下落位置的判断,在其与池塘水面的接触点,利用特殊的幅度值平均算法实现了池塘水面受到粒子扰动后所产生的波动效果;最后通过读取外部模型参数的信息,生成了池塘周围的辅助景观.绘制的结果证明这些构造和绘制方法是有效可行的.

Modeling and Rendering of Pool Scene with Rain and Snow in Virtual Environment

The effect of pool scene with rain and snow can consumedly enhance the immersion of virtual reality circumstance. How to build model for the motion of raindrop and snow flake, and how to simulate the model dynamically are important problems in field of simulation outdoors. Kinematics model is introduced in particle system to simulate fluttery raindrop and snow flake on diverse blowing wind conditions by changing the parameters such as particle mass, wind velocity, wind direction , etc. At the same time falling position of raindrop and snow flake is determined to simulate the effect of pool waves at the point of contact with disturbance by distinctive amplitude average algorithm. Lastly, accessory views around pool are simulated by using information of exogenous models. The experiments show the feasibility of generating realistic images of pool scene using the modeling and rendering techniques.