By using the role and the drafting methods, projective contour line of a quadric at random position can be drawn.

利用这一规律和作图方法，可以解决任意位置的非退变二阶曲面的投影轮廓线的作图问题。

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PROFILE: The true picture of a surface in relation to a horizontal line; a contour of a designated surface of a cup, cone, or roller.

型面轮廓：与水平线相比表面的实际轮廓线；实际设计的外圈，内圈或滚子的轮廓线。

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As the important content of face recognition, the extraction of face contour line is a hotspot and a nodus.

作为人脸识别的一个重要内容，人脸轮廓线的提取是许多其它艺术影像处理的基础。

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