三维场景中体积云的研究与实现

摘要

Cloud is a common natural scenery,the simulation of volumetric cloud is a difficult project in the field of computer graphics. In this paper,research the commonly used method of volumetric cloud simulation,which includes physical simulation method and empiri-cal model method. The physical simulation methods include particle system modeling,bubble modeling and voxel modeling,the experi-ence methods include texture mapping and the noise function. Based on the research of Perlin noise,the volumetric cloud simulation algo-rithm based on the 4 dimensional Perlin noise is implemented by the step of first building noise function,and then smoothing,last interpo-lating. The cloud dynamically generated and disappeared simulation is realized based on cellular automata theory. Compared and analyzed the above two methods,the advantages and disadvantages and the use cases of two kinds of implementation are illustrated.%云是一种常见的自然景物，三维场景中的体积云模拟是计算机图形学领域研究的难题。文中研究了体积云模拟的常用方法，其中物理模拟方法包括粒子系统、气泡建模和体素建模，经验模型方法包括纹理映射和噪音函数。在研究Perlin噪音函数的基础上，通过先构建噪音函数，然后平滑处理，最后进行插值处理这三个步骤，文中实现了基于四维Per-lin噪音的体积云模拟算法。基于细胞自动机理论，文中实现了云动态生成和消失模拟。通过对这两种方法的对比和分析，说明了两种实现方式的优缺点及使用情况。