主光 meaning in English

key light
◇主光线 chief ray; principal ray; 主光轴 primary optical axis; principal optic axis; main optic axis

To light my soldier guy i ' ve used just an omni to back light it and a mr spot to key light , with a mapped sphere to simulate the environment
（为了给这个士兵添加照明，我使用了一盏泛光灯作为背光，一盏mr聚光灯作为主光，然后用了一个贴图的圆球模拟环境。）
By placing the reticule in the main optical path of the tv tracking lens , it can not only take the place of the auxiliary optical path in displaying line of sight , but also simplifies the structure of the lens
将这种分化板置于电视跟踪镜头的主光路中，用以显示瞄准光标，可取代电视跟踪镜头的辅助光路，使镜头的结构得到简化。
To prove it , here is a render of the exact same scene , with the color of the back light changed to a pretty dark blue color , the front light with a near - white - blue color and the material for the text to a purple color
要继续提示渲染效果，接下来还有一个相同场景的渲染，不同的是背景灯的颜色改为深蓝，前主光的颜色改为接近白色的蓝色，并给文字赋予了紫色的材质。）