How to divide a circle into a square grid?

Question

How can I divide a circle into a square grid? Think of the subdivision of a plane, but with a circular border. It should look something like this, just imagine that the circle select cursor is the border:

I searched everywhere for an answer, but I could not find any. Any help will be appreciated!

related: http://blender.stackexchange.com/questions/14579/fill-cylinder-cap-with-quads/14580#14580 and http://blender.stackexchange.com/questions/16043/triangles-to-quads-problem/16044#16044 — , Jan 23 '17 at 15:01
@cegaton they are not related as I want a perfect square grid, not a deformed square grid like in those questions. — Tooniis, Jan 23 '17 at 19:19
May I ask why you need such a grid without caring about proper topology? — cgslav, Jan 23 '17 at 22:33

score 17 · Accepted Answer · edited Jan 23 '17 at 16:03

17

This is how I do it:

Create a circle and put it a little over the grid plane;
In Object mode select the circle first, then add the plane to the selection, by pressing ⇧ Shift RMB (the order is important);
Go to top view (Numpad 7) in Orthographic View (toggle with Numpad 5);
Go in Edit mode with ↹ Tab;
Be sure to have all the meshes selected (hit A);
In the T panel (or just by searching with Space) find Knife project and click it.
Invert the selection with Ctrl+I
Delete the selected mesh parts with X.

Like LukeD said in another answer, this causes your mesh to have a mix of ngons, quads and tris, but that's what you asked for in your question. :-)

edited Jan 23 '17 at 16:03

palkonimo

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answered Jan 23 '17 at 14:45

mugnozzo

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This looks like the answer I'm looking for. I'll try it. – Tooniis Jan 23 '17 at 19:16
Also I don't care about the ngons and tris in the edges because I'm not going to modify them. I'm only going to modify the quads. – Tooniis Jan 23 '17 at 19:17

atek · Answer 2 · 2017-01-23T12:55:30.453

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You can do with the F2 Addon Select 2 vertex and press f to make a edge Then Press F to make vertical edges same with the horizontal edges

edited Jan 23 '17 at 12:55

answered Jan 23 '17 at 12:19

atek

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Why did you double my answer? – cgslav Jan 23 '17 at 12:39
actually i answered and did not refresh somebody answered it after refresh my answer was below yours sorry – atek Jan 23 '17 at 12:44
You can just delete it to not make it a mess here. – cgslav Jan 23 '17 at 12:45
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The results don't look at all the same. – Weaver Jan 23 '17 at 13:00
@StarWeaver I did not get what you mean – atek Jan 23 '17 at 13:01
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Despite the final result looks like a grid, the horizontal and vertical edges built with this approach are disjoined: you are building two overlapping sets of faces. Perhaps it would be better to finish with Vertex Connect Path tool or something in order to truly subdivide the edges. – Carlo Jan 23 '17 at 18:04
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I did that with the knife but soon realised that it is not a perfect square grid. – Tooniis Jan 23 '17 at 19:16
@Tooniis what useful answer you like so that you can vote that person – atek Jan 24 '17 at 03:31

How to divide a circle into a square grid?

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