【摘要】 天空中的云对于构造逼真的室外虚拟环境是必不可少的。如何对云进行建模和绘制是计算机图形学研究的热点问题。本文首先详细介绍了Perlin噪音的概念和生成方法,并以此为基础绘制出3D云的图像;然后论述了使用所绘制的云的图像,运用基于图像的绘制技术在3D虚拟环境中实时绘制云的方法,我们生成的云的位置和方向能够随用户漫游时视点的变化而变化。更多还原

【Abstract】 Clouds are one of the most important parts in realistic 3D virtual environment. For many researchers, how to model and render clouds is a very interesting problem in computer graphics. This paper first introduces the concept of Perlin noise and the method of generating Perlin noise. We used Perlin noise to create 3D clouds images. Then we made use of image-based rendering techniques to render clouds in 3D virtual environment. With our method, the position and direction of clouds can be changed according to the users viewpoints when he is wandering in the virtual environment.更多还原