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。
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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