...向此交点的光线，进行阴影测试，目的在于看交点和光源之间有没有其他障碍物， 倘若没有，则交点被光源直接照明(Direct Lighting)，倘若有，则配上黑色，即 表示没有光照亮。
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semi-direct lighting 半直接照明
direct lighting luminaire 直接型灯具
simi-direct lighting luminaire 半直接型灯具
semi direct lighting 半直接照明
Lighting System direct current converter 照明系统直流变流机
A hybrid lighting technique composed of direct lighting and darkfield lighting is proposed after summarizing common lighting techniques and fully analyzing the characters of dies in the wafer. With the hybrid lighting technique, the vision system can acquire die images with high quality.
总结了常用的照明技术,在分析了芯片的光学性能的基础上,提出了采用直接照明加暗场照明的光源设计方案,得到了较高质量的芯片图像。
参考来源 - RFID标签封装设备中机器视觉系统设计与实现·2,447,543篇论文数据，部分数据来源于NoteExpress
N a lighting system in which a large proportion (at least 90 per cent) of the light is directed downwards 直照光 [electrical engineering]
Any given region is therefore more likely to receive at least some direct lighting, causing the softer shadows.
因此，任何地区更容易接受至少一些直接照明，导致软阴影。
The respect is designed in lamplight, indirect lighting combining direct lighting is given priority to, in order to emphasize the lobby of the space is concise, modern and metrical sense.
在灯光设计方面，以间接照明结合直接照明为主，以强调大堂空间的简洁、现代及韵律感。
In addition, that unless they have a decorative theme, lighting elements and fixtures should be concealed from direct view whenever possible.
此外，除非他们有装饰的主题，内容和照明装置应当回避尽可能直接查看。
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