平行光源

1
Directional Light
...rea）下，物体越接近地面，阴影越重，边缘清晰；物体离地面越远，阴影也越大，边缘模糊。但如果是平行光源（Directional Light），比如太阳，阴影就没有变化。
2
collimated light source
... collimated lamp 准直灯 collimated light source 平行光源 collimating aperture 准直孔 ...
3
Parallel light
4.4 Parallel light（平行光源）命令及参数详解第五章：材质贴图
4
Parallel light source
OpenGL ES 光源可以分么 o 平行光源(Parallel light source), 代表由位于无限么么均么光，太可以近匀体阳似控制平行光源。

短语

1
相反，从非激光平行光源发出的光就不能被光学所瞄准。
In contrast, the light from non-laser light sources cannot be collimated by optics as well.
2
用在弹头上安装针孔照相机的方法，并借助一个频闪平行光源，能够直接记录攻角——时间变化曲线。
The method of pinhole camera which is set up at the cone of a projectile, can record the yaw-time curve directly by a frequency-flash parallel light.
3
光学性能是在CHF - XM 35 - 500 W氙灯-汞灯高亮度点光源平行光源系统的照射下进行测定的。
Optical performance was measured under the irradiation of the CHF-XM35-500W xenon lamp with a parallel light source system.

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