Hi,
I am new to blender
Is it possible to add a vertex to a mesh created as a plane ?
Thanks,
Guillaume
Yes,
Go in edit mode (TAB key)
Select a vertex and with CTRL down left click with your mouse where you want to add the vertex.
This work for all kind of mesh object.
Yep, it adds a vertex but this vertex is not included in the mesh
I mean this doesn’t extend the mesh, rendering is the same than before adding the vertex
Is there a way to do this ?
You have to create a face.
Start from a plane,
add a vertex to the right of it as I describe before
select, from the right, 3 vertices
press de F key. This will create a face with the 3 vertex.
Vertices and edges themselves are invisible (For non-halo, non-wire materials). You need to add edges to vertices (select 2 verts and press F) and then faces (3 or 4 verts and then F) too.
Imagine a swarm of mosquitos flying hovering in the air. Each one flies in perfect formation with respect to the others. You can add mosquitos and you can subtract them. You can tell each and every one what its position in the squadron will be. Each bug will maintain that position until you move it or delete it.
Your mesh is a lot like this mosquito squadron only the indvidual mosquitos are invisible. Each invisible insect is a vertex in your mesh. Maybe this analogy is a bit silly but it draws a mental picture you can work with.
Now that you have all your mosquitos flying the way you want them, tie a piece of invisible fishing line between them to form the edges that connect each vertex. (Mosquito verteces always fly in such a way that the fishing line between them is pulled tight.)
Verteces and edges have no width, length or height by themselves. They only INDICATE a finite point in space. Your computer makes them visible for your benefit. If you couldn’t see them, how could you make your model?
Here’s where the fun comes in. Imagine you have a piece of tissue paper. Cut it the exact size and shape of one of the polygons formed by your fishing line edges. Glue it to the fishing lines. You have now formed a face. It is this face that Blender uses to render your model. As far as your computer is concerned, it’s the only thing that’s real.
In order to make a model out of a mesh you locate all your verteces in space, draw edges between them and fill in the faces the way you want. What makes Blender so special is that the PROGRAM does all the dirty work for you! You don’t have to locate each individual point. If you add a shape (primitive) from the menu and locate it in virtual space, Blender figures out the rest and you see the results on-screen.
Any sufficiently advanced technology is indistinguishable from magic.
– Arthur C. Clarke
I know there may be some flaws in my analogy. Modify or refute as you see fit. However, I’m sure you’ll see how the analogy gets the basic point across.
Now… You have some mesh. You want to add verteces to it.
Select the mesh. R-Click on it.
Edit the mesh. TAB.
Rotate your view as needed to get the best vantage point…
Locate your cursor where you want your new vertex to appear.
Hold down <CONTROL> key. L-Click mouse.
A new vertex appears. This will be a lone vertex, hovering in space.
If you pick a vertex in your mesh and R-Click on it to make it highlight (yellow) THEN create another vertex an edge will be created between them. You can Click-Click-Click and make whole strings of vertex-edge combinations to your heart’s content.
Click on one vertex. (Highlight in yellow.)
Hold down <SHIFT> and click on another. Both verteces are yellow.
Press “F” key. an edge will appear between them.
Shift-click on one more vertex. You have formed a virtual triangle in space.
Press “F” key again. This time you have drawn a triangle… BUT you also made a face on the polygon.
You can do the same thing with four points in space to make a quadralateral. (Four-sided polygon… Trapezoid. Paralellagram. Rectangle. Square.)
One caveat: Blender can’t put a face on “impossible” shapes. It will warn you if you try to make a “Concave Quad.” If you need to put a face on such a shape, attack it as if it was made up of two (or more) triangles.
One more trick:
Make a bunch of verteces in space. Connect them all to form a closed shape. (Try it first by making the outline of a pentagon.)
Ensure all of its verteces are highlighted.
This time, press <SHIFT> “F”. Blender fills in all of the interior parts of your shape with edges and puts faces on them automagically!
The same caveat about impossible shapes applies here. Only this time Blender just goes as far is it knows how and refuses to do the rest. Like before, just divide the area up into smaller ones that don’t contain impossible shapes.
There are lots more things Blender can do with verteces, edges and faces but I think that’s enough for now. Have fun fiddling with these tricks. Once you get your brain wrapped around this lot, you’ll no doubt find more!
Wow what a post 
What do you think about Delaunay and Voronoï meshes ? 