一种简化的流体方法快速仿真大型三维云场景

Simplified fluid method for fast simulation of large three-dimensional cloud scene

提出了一种改进的立体云模拟方法,用Navier-Stokes流体方程描述云的运动规律,同时考虑大气运动条件下云的特性,建立云的运动模型。在云的实时渲染方面,基于太阳光照方向和天气状况提出了一种简单的光照模型,大幅度地提高了云的渲染速度。此外,使用改进的环状Impostor技术来提高大范围云层的渲染速度。基于上述理论模型,利用实验室自主图形引擎开发了一套三维云仿真插件,广泛应用于各种实时仿真和科技娱乐项目中。该方法绘制的云具有规模大、真实感强、渲染速度快的特点。

This paper proposed an improved method for three-dimensional clouds simulation.It used Navier-Stokes equations to describe movement of the clouds,taking into account the characteristics of cloud under atmospheric conditions to establish cloud motion model.In real-time cloud rendering,it presented a simple illumination model based on the direction of the sun light and weather conditions,which greatly improved the rendering speed of the cloud.In addition,it used the improved ring Impostor technology to improve the rendering speed of large-scale clouds.With the independent graphics engine,it developed a stereo cloud plugin based on the method described in this paper,and applied it to various simulation systems and projects.The clouds generated by the method have large-scale,photorealistic and fast rendering features.