(光束曲线偏移)：投射光束时应用的高度偏移量，就算在光束径直指向时也能产生一个光滑的曲线。
Beam curve offset: the amount of height offset to apply to the projected beam to generate a smoother curve even when the beam is pointing straight.
用圆弧投射法解决圆锥曲线与其它空间几何要素的相互位置问题，可使作图更为简练、精确。
By using circular arc project, the relative positions of the conic curves and other spatial geometrical elements can be solved for simplified and precise drawings.
通过改变激光器投射的方向，在物体表面得到一系列曲线纹理。
The structure lighting, which is projected on the object by laser, is used as the texture for matching.
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