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As you know, edge made by 'f' shortcut across a face do not divide the face.

I don't know why this type of edge is necessary in Blender.

Is it not sufficient only one type of edges(dividing face) exist?

Please tell me the case in which 'f' type edge should be used.

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This is useful if you want to connect two vertices not connected by an edge already.

If you would like to cut the face into two triangles, select the two opposite verts and press J to join them.

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  • $\begingroup$ I know use of 'f' shortcut. I wonder what is the use of 'f' type edge on a face. I think it is not necessary in blender. $\endgroup$ – 나미손 Sep 14 at 19:51
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If you select a face and hit f, nothing should happen. If you select 2 vets and hit f, an edge is created between them, if you select 2 edges and hit f, a face is made. Blender does not care in what scenarios you use these functions so you can make all kinds of useless geometry with them, or you could make geometry that is useful to you - that is up to you as you are the creator and Blender is a tool.

Connecting verts and edges is one of the most basic functions in modelling in Blender so it would be hard to give examples of the use cases for it as it can be used for pretty much anything. You could do 3d modelling by only duplicating vertices and connecting them to make edges and then connecting them to make faces if you wanted.

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  • $\begingroup$ I just wonder why there are two types of edges(made by 'f' and 'j') joining 2 vertices on a face. I think that only one type of edges(which divide face ) is sufficient and the other type of edges(made by 'f') is not necessary.(I'm concerned about the types of edges not functions) If I'm wrong, there must be some examples which must use the edges made by 'f'(which do not divide face) on a face. I just want know such cases. Only one case will suffice. $\endgroup$ – 나미손 Sep 14 at 21:41
  • $\begingroup$ F does not create an edge on a face, it creates an edge between two vertices. If they happen to belong to a face then it creates an edge over that face just because it's there. The face does not have anything to do with the operation, it is just there. The operation is to join two vertices with an edge no matter where those vertices are. If you want to divide a face, any other operator like for example bevel operator is also no help at all, do you think it is not needed? No, it's just for another task same as joining two vertices with f. $\endgroup$ – Martynas Žiemys Sep 15 at 0:03
  • $\begingroup$ You are mistaken about my opinion. I do not doubt the necessity of operation 'f' but the weird edge geometry(especially on a face) as a result of 'f'. $\endgroup$ – 나미손 Sep 15 at 1:08

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