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尚士同先生撰文《对有关斜视图画法的异议》(载《美苑》1988——1期),对本人编写的《绘画透社》一书有关倾斜透视(斜俯视、斜仰视)的提法持有异议,这是对视平面、视平线不同看法所致本文拟对此谈个人看法,就教于《异议》文作者及其他同行。一透视学的空间坐标既然透视学是研究空间景物平面画法的学科,为了正确认识被画物体的空间位置和方位斜度,经由空间确定有关灭点、灭线在画面上的位置,就必须建立一个空间坐标体系。这个体系由视平面、视垂面、画面三个平面垂直相交而成;三平面两两相交的中视线、视平线、视垂线为三条坐标轴:三轴交点为主点,视点在中视线始端(见图一) 对空间任何一点,以视平线辨上下,视垂线辨左右,中视线辨远近,便测得其正确位置;对被画
Mr. Shang Shitong’s article “Objections to the Squint Picture” (contained in “Mei Yuan Court” 1988-1), I wrote “Painting through the Society,” a book on the perspective of tilt (tilt down, tilt down) mention The law holds the objection, which is caused by the different viewpoints of the visual plane and the horizontal line. This article intends to talk about personal opinions and to teach the author of “dissent” and other colleagues. A perspective of spatial coordinates Since perspective is the study of spatial landscape plane painting disciplines, in order to correctly understand the location of the object being painted and the azimuth slope, through the space to determine the vanishing point, the extinction of the position on the screen, you must Establish a spatial coordinate system. The system consists of the plane of sight, depending on the vertical plane of the three planes perpendicular to the intersection; three planes intersect each other in the line of sight, the line of sight, depending on the vertical three axes: the intersection of the three axes as the main point of view in the Line of sight at the beginning (see Figure 1) Any point of space, as the level of line up and down, depending on the vertical line around the identification, in the line of sight of the distance, they measured the correct location;