What is the vertical distance from the viewpoint to the center?

The vertical distance from the viewpoint to the center is usually called sight distance.

viewpoint is a concept in painting. In western painting (stereoscopic painting), the position of the author (that is, the observer) is defined as a point, which is called viewpoint. The main lines of other objects are arranged in this way, and different angles are called perspectives. Of course, it can also be cited to other disciplines. Centroid point: It can be divided into near-center point and far-center point. Near-center point refers to the point closest to the mass centers of two particles in the two-body problem, while far-center point refers to the point farthest from the mass centers of two particles in the two-body problem.

vertical distance refers to the distance along the longitudinal axis. Vertical distance between two lines: find any point on one line as the vertical line of another line, and the length of this vertical line is the vertical distance between two lines. The vertical distance from the viewpoint to the center is usually called sight distance. The farther the sight distance is, the larger the range of sight, and the closer the sight distance is, the smaller the range of sight.

Application of viewpoint sight distance:

(1) Multiple viewpoints. Chinese painting is good at expressing rich plots, while western painting pays attention to single viewpoint (similar to photography). The rich perspective plot emphasized in Chinese painting can't be completed with a single point of view. Therefore, Chinese painting is represented by multiple viewpoints (similar to dividing and recombining multiple shots of a camera).

(2) high vision. The height is expressed from a slightly prone perspective. The "distant mountains are high" mountains are often painted in the distance, and then they are connected by clouds. Show a feeling that people are higher than mountains. Chinese painting does not look up at close range to express mountains.

(3) Long-distance Chinese painting emphasizes that "it's a long way to go" and requires that the objects in the painting conform to the normal proportion of things. Therefore, the painter must use long-distance to express them. Picasso's works break the basic law of perspective, and all the obverse and reverse sides of an object, which can be seen and can't be seen, are represented in a two-dimensional space. To understand Picasso's paintings, we must first abandon perspective.