It is called edge to the line resulting from the intersection of two surfaces or planes. According to DigoPaul, edges are also the segments of a line that mark the boundary of the sides of a flat figure.
It is possible to associate the notion of edge with the concept of edge. If we focus on a polyhedron (a body with flat faces containing a finite volume), the edges are those straight lines at which two faces intersect.
Delving a little deeper into the concept of polyhedron, it is a three-dimensional body belonging to classical geometry. In its etymology we find components of the Greek language that refer to the presence of “many faces.” Although many people confuse the polyhedron with the polygon, the latter is its topological similarity for two dimensions: it is also created from vertices and edges, but it has only one face; in fact, a polyhedron is a set of polygons.
In addition to the polygon, there are other similar topologies in the field of classical geometry that are related to the polyhedron, although none of them is three-dimensional: the vertex (also known simply as a point) is its similarity in zero dimensions —although in the everyday speech is common use of this word as a synonym for “small circle”, the vertex is not long, wide or high; the edge, consisting of one dimension; the polycorus, which in addition to the three dimensions of the polyhedron adds one, represented by cells.
In the field of graph theory, the edge arises from the link between two vertices of the same graph. When two vertices are connected through an artist, they are adjacent. In this framework, the vertices are said to be incidents to the edge in question.
Three-dimensional graphics design uses many of these concepts on a daily and natural basis to create extremely complex models, which at first glance do not seem to rely on basic geometric shapes. During the painstaking work carried out by 3d artists, they manipulate the vertices, edges and faces of their models thousands of times to achieve the results they seek at every step.
The 3d modeling and animation programs have the option of allowing exclusive access to one of the elements just mentioned, and each one offers a series of advantages that are suitable for different situations.
For example, when modeling a character’s face, it is necessary to slightly adjust the position of the vertices many times, from the beginning to the end of the work; In this case, moving one face could alter the position of two or three other vertices unnecessarily. If, on the other hand, we are designing a room and want to modify its height, it is appropriate to take the face that represents the ceiling and move it downwards, instead of moving each vertex or edge separately.
For geography, the edges are the rock ridges that some mountains have. In general, these edges are created by erosion generated by glaciers and allow the separation of two valleys.
The idea of edge also appears in botany. In this case, the edge is the hair-like filament that some plants have, especially grasses. Barley is a species that has edges.
Finally, in colloquial language, edge is often referred to with reference to a point of view or perspective. For example: “The prosecutor decided to open a new edge and will now investigate the possible link between the suspect and the victim’s mother”, “The judicial section is just one edge of the problem: I am concerned about the political consequences of this fact”, “I would like to approach the subject from a different angle”.
