各向异性散射云实时绘制的研究与实现

针对目前云在各种实时应用中逼真度较差的问题,采用细胞自动机建模,把云的绘制分为预处理和实时运行2个阶段来处理;引入云的阴影关联表及变形球光照纹理数据库来提高绘制效率;同时,对云的光照散射模型中的相位函数进行了改进,使模拟的云沿视点方向呈现各向异性。实验表明:在不影响云模拟实时性的前提下,该方法有效提高了云模拟的逼真度,能够生成真实的三维光照云,满足了各种实时应用的需要。

Real Time Rendering of Clouds in Anisotropic Scattering

To solve the problem of reality in real-time application of clouds,the cellular automata is used to simulation cloud,the rendering of clouds are divided into two stages,pre-processing and real-time rendering;shadow relation table and metaball lighting texture database are proposed to speed up the rendering efficiency;Besides,the phase function of the lighting scattering model is improved,it can generate clouds anisotropy in the view direction.The experiment shows that,this method can improve the fidelity of clouds without sacrificing rendering efficiently and capable of producing a true three-dimensional illumination clouds to meet a variety of real-time application needs.