What joining two vertexes means in Blender
Joining two vertexes (the plural of vertex, meaning a single point in 3D space) means drawing a line between them to create an edge. In Blender, you select both points and use the F key to make a face, or the J key to create a direct edge between them. The method you choose depends on whether you want to fill the space between the points or straightforward connect them with a line.
This is one of the most common modeling tasks because it lets you build geometry piece by piece. You might join vertexes to close a gap in a mesh, extend a shape, or repair a model that has broken edges.
Key Takeaways
- Press Tab to enter Edit Mode, then select both vertexes you want to connect by holding Shift and clicking each one.
- Press J to create a single edge between the two points, or F to create a face that fills the space between them.
- If you select more than two vertexes, F creates a face across all of them, while J creates edges in a specific pattern depending on your selection order.
- Press Alt+Z to toggle X-ray mode so you can see and select vertexes that are hidden inside your model.
Entering Edit Mode and selecting your vertexes
Start by clicking on the object you want to edit, then press Tab on your keyboard. Blender switches from Object Mode to Edit Mode — you will see the vertexes of your model appear as orange dots (or white if they are selected).
Now select the first vertex by clicking on it. Hold Shift and click on the second vertex you want to connect. Both should now appear highlighted. If you accidentally select the wrong vertex, hold Shift and click it again to deselect it. You can also press Alt+A to deselect everything and start over.
If the vertexes you need are hidden inside the model or behind other geometry, press Alt+Z to toggle X-ray mode. This makes the entire mesh semi-transparent so you can see and click on points that would otherwise be invisible.
Using the J key to create a single edge
With both vertexes selected, press J. Blender draws a straight edge between them. This is the fastest way to connect two points when you only want a line, not a filled surface.
The J key works only when exactly two vertexes are selected. If you have three or more selected, pressing J will do nothing — you need to use a different method (see the next section). If nothing happens when you press J, check that you have exactly two vertexes highlighted.
Using the F key to create a face between vertexes
With both vertexes selected, press F. Blender creates a face — a filled surface — between them. If you selected only two vertexes, Blender creates a single edge (the same result as J). If you selected three or more vertexes, F creates a face that spans across all of them.
This is useful when you are filling holes in a mesh or building a surface from scratch. For example, if you have four vertexes arranged in a square, selecting all four and pressing F creates a square face that fills the space between them.
If the face appears inside-out (the wrong side is facing outward), press Ctrl+F and choose Flip to reverse its direction. This matters because Blender uses face direction to determine which side is the "front" for lighting and rendering.
Connecting multiple vertexes in sequence
If you need to connect more than two vertexes in a specific order — for example, drawing a path from point A to point B to point C — select them in the order you want them connected, then press J. Blender creates edges between each pair in the sequence you selected.
This works because J respects selection order. If you select vertex A, then B, then C, pressing J creates an edge from A to B and another from B to C. If you select them in a different order, the edges will connect differently. This is why selection order matters when using J.
Fixing common mistakes when joining vertexes
If you press J or F and nothing happens, you likely have the wrong number of vertexes selected. Press Alt+A to deselect everything, then carefully select exactly two vertexes and try again. You can also press Z and choose Wireframe from the menu to see your entire model as lines, making it easier to spot and select the points you need.
If you created an edge or face in the wrong place, press Ctrl+Z to undo. Blender remembers your last action and will remove the edge or face you just created. You can undo multiple times by pressing Ctrl+Z repeatedly.
If your new edge or face is invisible, it might be on the back side of your model. Press Ctrl+F and choose Flip to reverse its direction. If it is still invisible, press Shift+H to unhide any hidden geometry, then try again.
When to use edge loops instead of single edges
If you are connecting vertexes to build a complex shape, you might need edge loops — rings of edges that run around your model. These are created differently than single edges: you use Ctrl+R to draw a loop, then click to place it where you want it.
Edge loops are more powerful than single edges because they let you add detail to an entire section of your model at once. However, for straightforward point-to-point connections, the J key is faster and more direct. Learn single edges first, then explore edge loops once you are comfortable with basic modeling.
Frequently Asked Questions
What is the difference between pressing J and pressing F?
J creates a single edge between two vertexes. F creates a face (a filled surface) between them. With two vertexes, both produce similar results, but F is useful when you have three or more vertexes and want to fill the space between all of them at once.
Can I join vertexes that are far apart?
Yes. Blender will create an edge or face between any two vertexes, no matter how far apart they are. The edge will be a straight line through empty space if the vertexes are not adjacent. This is sometimes useful for creating internal structure, but usually you want to connect nearby points.
Why does my new edge or face look wrong?
The most common reason is that the face is pointing the wrong direction. Press Ctrl+F and choose Flip to reverse it. If the edge or face is in the wrong location entirely, press Ctrl+Z to undo and select the correct vertexes.
Do I have to be in Edit Mode to join vertexes?
Yes. You must press Tab to enter Edit Mode before you can select individual vertexes or use J and F. If you are in Object Mode, clicking on your model selects the entire object, not individual points.
What if I want to connect more than two vertexes at once?
Select all the vertexes you want to connect, then press F to create a face across all of them. If you want to connect them in a specific sequence with individual edges, select them in order and press J instead.