目的：研究不同方向光源对数码色度值的影响。
Objective: To study the effect of light from different direction on digital chromatic value.
函数的源代码如下。注意如果光源是方向光，向量的前三个部分将被归一化，来节省时间。
The source code is presented next. Note that if the light is a directional light, the vector with the first three components is normalised to save time latter.
前三个值表明了光源的位置，在点光源的，或者方向光的方向情况下。
The first three values specify the lights position, in the case of a point light, or the lights direction for directional lights.
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