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.
最后一个值定义了光源是位置光源还是方向光。
The last value defines wether the light is positional or directional.
如果灯光是聚光灯或方向光，这必须是一个2d纹理。
If the light is a Spot or a Directional light, this must be a 2d texture.
阴影柔化是根据到相机距离进行淡出的。只用于方向光。
Shadow softness fade based on the distance from the camera. Directional light only.
基础通道用一个逐像素方向光和所有球面调和光渲染物体。
Base pass renders object with one per-pixel directional light and all SH lights.
首先我们需要去定义光的位置(后者为方向光定义一个方向)。
First it is necessary to define the light's position (or direction for a directional light).
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.
分析了隧道级联半导体激光器内限制层厚度和垂直方向光束质量因子的关系。
The relation between the inner cladding layer's thickness and the quality factor of vertical beam is analyzed.
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.
当没有必要时，不要使用像素灯-选择只有一个(最好是方向光)像素灯的光线影响您的几何图形。
Do not use pixel Lights when it is not necessary — choose to have only a single (preferably directional) pixel light affecting your geometry.
禁用正向渲染添加通道。这会使这个着色器支持一个完整的方向光和所有逐顶点/SH计算的光照，使着色器变小。
Forward rendering additive pass. This makes the shader support one full directional light, with all other lights computed per-vertex/SH. Makes shaders smaller as well.
定向光没有位置，只有方向。
A directional light doesn't have a position, only a direction.
人生必须的知识就是引人向光明方向的明灯。
Life must be the ever-burning lamps of knowledge is an opening direction.
我们需要某人拉着自己的手带领我们走向光明并且给我们指明方向。
We need someone to take our hand, and take us to the light, and point us in a direction.
结果表明：强的激波结构使激光束远场强度分布发生了向光程增大方向的明显偏折，对于波长不同的激光束得到光束通过流场后的远场强度分布不同。
Result shows that laser beam deflects to the direction which optical path length increase. The far-field intensity of laser beam is not the same for the difference of wavelength.
结果表明：强的激波结构使激光束远场强度分布发生了向光程增大方向的明显偏折，对于波长不同的激光束得到光束通过流场后的远场强度分布不同。
Result shows that laser beam deflects to the direction which optical path length increase. The far-field intensity of laser beam is not the same for the difference of wavelength.
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