大气效果绘制的若干问题研究

Some Problems about Rendering Atmospheric Effect

大气退化作为户外场景的一个标志成为计算机视觉和计算机图形学领域研究的一个热点和难点.本文对天空模型、色彩的光谱表达和大气退化效果绘制等几个主要问题进行了探讨.天空模型的选取是大气效果绘制的一个重要问题.本文给出了几种典型的天空模型,包括:测量模型,解析模型和直接计算模型;本文还讨论了色彩的光谱表达和转换问题,介绍了具体的转换方法.本文最后提出了一个使用上述天空模型和色彩表达方法的扩展路径跟踪方法,用以对大气效果进行绘制.在实验部分,本文给出了基于解析模型的天空和大气介质存在的场景的绘制效果.

As an important phenomenon of outdoor scene, atmospheric degradation was paid increasingly attention in the field of both computer vision and computer graphics. This paper discusses the conversion between the color triple and the spectnan, the sky model, and the rendering method of atmospheric effect. Building on an extended path tracer, this paper describes an integrated rendering framework of atmospheric degradation. Also in the experiment part, this paper puts forward the rendering results of sky and the foggy outdoor scene.