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。
There are two basic ways of reading a drawing: form analysis method and line and surface analysis method.
看图的基本方法有两种形体分析法和线面分析法。
Material Description: Drawing silver aluminum surface treatment, surface above article Rainbow MFC board, The following table gray line wood, rainbow article MFC board;
材质说明：拉丝银铝材表面处理，台面以上彩虹条MFC板，台面以下为灰线木、彩虹条MFC板；
Meanwhile, the drawing regulations about line segments and curly segments of tube bending surface are analysed.
同时还利用计算机图形学原理，对管件外圆表面直线段、弯曲段的三维绘制进行处理分析。
The treatment of some special line segments on body surface is studied by analyzing the validity of joint surface boundary. The forming process and drawing principle of aggregate are stated.
通过分析贴合面边界的有效性，研究形体表面某些特殊线段的处理，阐迷了集合体的构形过程及画图的原则。
The mold is programmed according to 3d mold without drawing an assistant line or surface.
这个模型没有做一条辅助线和辅助面，完全根据三维模型加工编程。
The mold is programmed according to 3d mold without drawing an assistant line or surface.
这个模型没有做一条辅助线和辅助面，完全根据三维模型加工编程。
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