When constructing technical objects I often come to a point where I want to add something into a corner. I haven't found an easy way to do so in a topologically correct way.

As a simple example this would be the situation with the corner to be filled enter image description here

And this is the target to be achieved: enter image description here

Given how easy it is to extrude such a block, I wonder if there is no easy way here as well.

Solutions I've tried so far:

  • extrude one of the two adjacent faces -> this gives a topologically incorrect model which causes problems later on
  • add a cube of the desired size, and make a boolean union -> (almost) impossible to avoid creating small steps and quite cumbersome
  • extrude one edge and fill the three faces manually afterwards. -> this is topologically correct, but still a bit cumbersome
  • isn't there an easier way???

2 Answers 2


If you have F2 addon enabled, here is a very magical trick.

Pressing F when F2 is enabled, several things will happen:

  1. If 1 vertex is selected, it will create a face from the 2 edges connected with the vertex in the direction/position of the mouse cursor.
  2. If 2 vertices or an edge is selected, it will try to created a quad face with the adjacent edges/vertices. And the result doesn't need merging or 'remove double'.
  3. If 3 or more edges are selected, it will simply create a face with selected edges. Result can be an N-gon.

enter image description here

  • $\begingroup$ That's indeed a very magical and helpful trick! Thanks :) $\endgroup$
    – derHugo
    Commented Jun 20, 2017 at 5:08
  • $\begingroup$ @derHugo, thanks to the developers of the F2 addon. It's such a nice feature. $\endgroup$
    – TeaCrab
    Commented Jun 20, 2017 at 20:25

I've tried some methods with Bridge Edge Loops, Grid Fill and such, but I think that the fastest way would be this one:


  1. Remove corner Edge.
  2. Select Edges around one corner wall.
  3. Turn on Snapping to Vertex.
  4. Extrude along needed axis - E > X in this example.
  5. Create Face - F.
  6. Select all (A) and W > Remove Doubles.
  • $\begingroup$ nice trick to plan ahead using "Remove Doubles". But the F2 addon from @TeaCrab seems not only faster, but also more versatile (works as well for example if extrude is not along an axis). $\endgroup$
    – kameamea
    Commented Jun 19, 2017 at 13:57
  • $\begingroup$ The method @LukeD provided can be useful when the geometry isn't simply 3 missing faces. His method is much more efficient when there are a number of edges along a hole, F2 in that case will be a bit of headache. $\endgroup$
    – TeaCrab
    Commented Jun 19, 2017 at 18:13

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