首先，你需要分别在室内和室外拍摄眼部照片，用于校正眼球跟踪系统。
First, you have to calibrate the system by snapping pictures of your eyes both indoors and outdoors.
主要光源称为主光。主光常常用辅光作补充。室外拍摄的主光为阳光。
The main source of illumination is called the key light. The key light is frequently supplemented by subsidiary lighting. The chief source of light for outdoor shooting is sunlight.
如果你为一部学生电影试镜，那么这类型电影大部分都是在室外拍摄，手持摄像机而且没有灯光，你的妆容要稍淡一些，粉底稍微薄一些。
If you're auditioning for a student film-most of them are shot outdoors with handheld cameras and no lighting-make sure you wear a little less makeup, a little less powder in particular.
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