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Is it possible to fill this hole with a grid?

hole in grid mesh

I tried with Grid Fill

mess after grid fill

With F fill (but no grid)

giant N-gon after filling

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  • $\begingroup$ If the mesh is viewed from the top, is it still regular? Are the verts just shoved up the Z axis? $\endgroup$ Mar 10 '18 at 18:01
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I'm no expert on this feature, so this is what i do: enter image description here

Basically, i delete the faces so i can select the whole edge loop with one ALT+right click and THEN use grid fill.

Its about having the same amount of vertices selected on each side or something. But as i said, i dont really understand it that well xd Cause i would think "oh, i can do this": enter image description here

Nevermind then...

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a hilly terrain with a hole in it First start by making the hole match up with the underlying grid. In my case I Filled the two faces on each side, then deleted the one in the corner.

animated gif show the start of filling the hole

Now it is a simple matter of using the Bridge Edge Loops operator. Select the vertices along the two long edges, but not the corner vertices. Like this:
proper selection.

Run Bridge Edge Loops, either from the 3D view header Mesh > Edges > Bridge Edge Loops, or from the specials menu W Bridge Edge Loops. Wait! Before doing anything else open up the operator history (bottom part of the tool shelf or press F6). Change the Number of Cuts to match the topology (in my case it was three), and set the Interpolation to Blend Surface.

the hole after Bridge Edge Loops Ah that's looking better.

Last thing to do is fill the remaining holes. That is easily done in one step. Just select the edges (like I show in the image below) and run Bridge Edge Loops again.
last selection

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