贵刊1988年第3期上发表了吴诗中先生的这篇文章。文章前半部分讲平视中的网格透视图画法,基本无误。下半部分讲俯视中的网格透视图画法,存在着明显的错误,在此与吴先生进行商榷。作透视图,不论采用什么方法,都是作几何图性质的,既要有严密的科学的作图方法,又要有假设的在尺度上的已知条件,然后才能开始作图。作透视图首要的已知条件是视距(即主点与画面间的垂直距离),然后根据视距长度测得物体消失点的位置,再进行物体的透视图画法。此文的作图方法首先缺乏这方面的基本要求。文中还有些名称的基本概念,也是有歧义的,如视平线与地平线的概念及其关系等。这里不作重点商讨这方面的问题,在指出错误所在时仍按吴文中的作法来进行分析。 You published the third issue in 1988, Mr. Wu Shizhong this article. The first half of the article talks about the perspective of grid perspective drawing method, basically correct. The second half of the top-down view of the grid perspective drawing method, there are obvious errors, in this discussion with Mr. Wu. As a perspective view, no matter what method is used, it is geometric in nature. It requires both a rigorous scientific method of drawing and a hypothetical known condition on a scale before it can begin to map. The most important known condition for the perspective view is the line-of-sight (ie, the vertical distance between the main point and the picture), and then the position of the vanishing point of the object is measured according to the line-of-sight length. First of all, the method of drawing this article lacks the basic requirements in this respect. The article also some of the basic concepts of names, but also ambiguous, such as the horizon and horizon of the concept and its relationship. Here do not focus on the issue in this regard, pointed out that the error is still Wu Wenzhong analysis.