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近年来提出的云的真实感绘制算法大多采用纹理操作进行绘制,绘制算法复杂,渲染过程较长,对计算机硬件的要求高,不能完全满足飞行仿真的实时性要求。为解决上述问题,从光的单一散射出发,考虑云和大气粒子引起的光衰减率,采用阴影切片的方法分割体数据,在太阳照射方向上和视点观察方向上对切片数据进行分析,从而快速绘制出真实感三维云。仿真结果表示,生成的三维云效果真实,具有良好的实时性,能够满足飞行仿真及其他领域的要求。
In recent years, the rendering algorithms of cloud reality are mostly drawn by texture operations. The rendering algorithm is complex, the rendering process is long, and the computer hardware requirements are high, which can not fully meet the real-time requirements of flight simulation. In order to solve the above problem, we consider the light attenuation rate caused by clouds and atmospheric particles based on the single scattering of light, divide the volume data by the method of shadow slice, analyze the slice data in the solar radiation direction and the viewpoint observation direction, Draw a realistic 3D cloud. Simulation results show that the generated 3D cloud has real effect, good real-time performance, and can meet the requirements of flight simulation and other fields.