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I have a bunch of closed cylinders and I want to add faces between them (not inside the closed edges). Would be grateful if someone can help me with that.

enter image description here

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    $\begingroup$ I'm not sure there's a way to do it, maybe you should create a module of your object and repeat it with an Array modifier? $\endgroup$
    – moonboots
    Jan 11 at 10:45

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@Hrishav's answer is a good lead but it's quite incorrect. You will need booleans for this and also, like @moonboots said in the comments, you'll need to join your cylinders to one object if you haven't already.

After following the steps that I describe here, you'll end up with this :

enter image description here

It is the fast way but the topology is really messy, if you want to have proper topology, you may want to consider doing retopo.

After joining your cylinders, create a Cube (it has to be a closed volume so the Plane is a no-go and the cube is the simplest IMO --for the method I describe, that is-- ), place the cube like this :

enter image description here enter image description here

Make sure the top end of your cylinders are outside the cube and the bottom end inside.

Add a Boolean modifier set to Difference to the cube and select the cylinders as the boolean Object :

enter image description here

Apply that boolean. You can hide your cylinders to better see the result :

enter image description here

Now you can go to Edit Mode and delete the lateral and bottom face of the cube :

enter image description here

As I said in the beginning, this topology is really messy but this is what I would suggest if you want a quick result.

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    $\begingroup$ You can also duplicate the cylinders, fill the caps (select the shortest edge, select similar by length...), and then boolean difference a plane with that. $\endgroup$ Jan 11 at 11:15
  • $\begingroup$ Yes, this would work, in my example, I have only 13 cylinders and filling their caps one by one is still doable but it would be a nightmare to do that with those from the question unless there is a fast way to do that too? $\endgroup$ Jan 11 at 11:27
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    $\begingroup$ select a single edge of the cap, Shift+G, length, F. $\endgroup$ Jan 11 at 11:39
  • $\begingroup$ Pressing F from there actually fills the individual caps, thank you for that tip. $\endgroup$ Jan 11 at 11:44
  • $\begingroup$ Thanks for your help. It worked. My mistake was unioning them rather than differencing them using the Boolean modifier. $\endgroup$
    – BroAli
    Jan 11 at 12:23
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Just for completeness a simple way without joining your cylinders. Move them in a collection and use this collection as operand type for the Boolean operation.

enter image description here

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Select all the meshes, join them into one object. Then add a Plane mesh, and add a boolean modifier. Im not super sure which one works. I just try all of them one by one, but i think the Intersect will work, probably.

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  • $\begingroup$ Thanks for your reply. I have tried this before, but the plane mesh adds faces inside cylinders too, and I couldn't find any ways to distinguish the inter and outer faces of cylinders. $\endgroup$
    – BroAli
    Jan 11 at 11:02

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