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Lets say I have a plane, and I extrude two edges, it would produce a gap. I would like to fill this gap by using the projected intersection of the new outer edges. Shown in the right most example of the image below:

enter image description here

I can extrude the two vertices and fill the area, making the desired outcome. If I had used F to fill before I've made the vertices meet, the result would be a square with diagonal edges (the empty area would be filled and turned into a triangle, not a square).

For my situation, I am trying to do the same, except I am using a circle. If I simply hit F to join the two vertices I get the result seen on 3. How can I connect the two vertices where they meet (shown in 4). Are there any tools to get the intersection or fill it automatically?

enter image description here

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2 Answers 2

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In Blender, navigate to File > User Preferences... > Add-Ons and search for "f2". Enable this add-on:

F2

So now, if you have the following extruded plane:

Extruded plane

Select the vertex on the innermost corner of the face you want to create:

Selected vertex

Now, press the F key, and the F2 add-on will complete the face, where the vertices should meet:

Pressed F

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    $\begingroup$ This doesn't work on other than square geometry. $\endgroup$ Jan 13, 2016 at 10:55
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You might want to try the tinyCAD addon.

Select the two extruded edges then choose w->TinyCAD->VTX Auto and you will get a vertex joining the two where they would intersect.

enter image description here

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