Abstract: It is difficult to draw the effect of reflection and refraction of plentiful water vapor in real time three-dimension scene.This article achieves the effect by solving two key problems：real time and reality，and balancing their relationship.That is to say，on the basis of real time，the scene of reflection and refraction of water vapor is reproduced most authentically.It is basically solves this difficult point.

Key words: real-time rendering, reflect and refract of water drop, effect file, Lee diagram

摘要： 空气中大规模水汽反射效果是实时三维场景中的一个难点，通过解决两个三维制作的关键问题：实时性和真实性，及其之间的平衡关系来实现效果。即在实时性的基础上，最真实地再现彩虹的基本特性。基本解决了如何在三维场景中实时渲染空气中水滴反射太阳光的问题。

关键词: 实时计算机图形学, 水滴折射原理, 效果文件, 李氏图