In engineering drawing courses, the projection of point, line and surface is the basis of learning physical projection, which is often difficult for beginners to learn.
在工程制图课程学习中，几何元素点、线、面的投影问题是学习形体投影的基础，也是初学者刚开始接触制图知识，学习中容易感觉困难的部分。
This paper presents a pixel level algorithm for drawing implicit surfaces, which accomplishes hidden line removal according to the feather of implicit surface.
文章提出了一个隐式曲面的象素级生成算法，并针对隐式曲面的特点实现了隐藏线消隐。
Drawing a straight line on a piece of stone and make the surface curved naturally on one side, the curved surface sprawl across the other three edges.
在一块石板上刻画一条直线，在线的一侧做成起伏不定的自然曲面，曲面向另外三边自由蔓延。
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