We are doing it by shadow so you just project to the X-axis.
只需投影到x轴。
Move with the X axis micrometric movement the sharp shadow, till the digital comparator red light is on the zero right position.
微调移动X 轴接近“十”字比较尺，直到数字比较器的指示灯在零点右边变亮。
Note the second shadow to the right of her nose with the "off-axis hard" fill lighting.
值得注意的是第二个阴影右边的鼻子长轴的“硬”填补照明。
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