摘要
本文介绍了一个模拟自然光的光源模型。光源模型由球冠和按一定密度均匀分布其上的点光源组成,每个点光源包含透射光分量和散射光分量,它们的强度由太阳的位置及气候条件确定,改变透射光和散射光的比例以及太阳位置,可以获得不同气候条件和一天中不同时刻的光照。本文同时还介绍了用光线跟踪方法合成在新光源照射下的图形方法。最后给出了令人满意的实验结果。
A new light source model to simulate natural light is introduced. The model is composed of a series of point light sources (PLSs) distributed on a sphere cap in a lattice at some resolution. Every PLS contains direct and diffuse light. The intensity of each PLS depends on weather conditions and the position of the sun. With different rate of these two kinds of light. We can get illumination under different weather conditions. With different position of the sun. We can get different illumination in a day. We use ray casting method to render graphics illuminated under new light source.
出处
《计算机学报》
EI
CSCD
北大核心
1990年第4期282-288,共7页
Chinese Journal of Computers
