# How to connect 2 vertices with edges?

This sounds as a very basic question, I guess I just don't know proper terms to find the answer at once..

I'd like to create a complex polyhedron, so I'd like to create a tetrahedron first. Starting from a cube, I can get a figure like the one below (by deleting some faces and edges), but how do I connect those vertices with 3 missing edges?

Although the main question is the one in the title, other advices about creating a tetrahedron are welcome, too.

• Try selecting the two vertices you want to connect and press F of the keyboard. The same tool can be used to connect two edges with faces. – CyberBurst Oct 21 '16 at 14:17
• – Dan Oct 21 '16 at 14:47

The answer is simple. Just press F between two vertices.

And your tetrahedron problem can be solved as follows:

• Delete one vertex and join all vertices with F to make a triangle.

• Subdivide the triangle.

• Go to the outer vertices and scale them on the xy axis to 0.

• In the last step you only have to move the selected vertices on the Z axis by one.

That's it.

(Of course, don't forget to swap normals.)

• it is not completly a tetrahedron =( the edges are not all equally long.... bad answer – Ruben Nunez Oct 21 '16 at 14:45
• Right, so it's the F button. But what's the name of the operation? – YakovL Oct 21 '16 at 16:08
• the name is [Make Edge/Face] press space and write the function name.... =) – Ruben Nunez Oct 21 '16 at 18:41
• F is to form a face, if you want to join 2 vertices to make an edge, better to press J – Eric Brochu Jun 4 '19 at 21:37

There is already a tetrahedron hiding inside the Blender default cube:

Note: With two vertices selected, hitting the F key will create an edge between them. With more than two vertices selected hitting the F key will create a face. F = Fill (fills in the space between selected).

Revealing the tetrahedron:

• Select the three vertices that make up the blue triangle and hit the F key.
• Repeat for the yellow, pink and the fourth triangle.
• Delete the four vertices of the cube that are not being used.
• Nice, I should have thought about this one :) An unfortunate thing is that we still have to use approximate values of a rotation angle to put this one on its face and use 2 rotations for that.. – YakovL Oct 21 '16 at 22:24

For the sake of completion you can do a tetrahedron directly by enabling the Add Mesh Extra Objects Addon:

On the 3D viewport you can then add>Math Function>Regular Solids and choose a Tetrahedron from the Toolbar (or on the F6 Menu)