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So, I managed to produce a sphere sorrounded by cones, like this

enter image description here

The idea is to create a porous particle showing holes with the shape of those cones (exluding them like in this image).

enter image description here

I have already joined all the cones using Control+J, the next step should be something like this option (typically used in other 2D Graphic Design Software) enter image description here

Thanks!

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  • $\begingroup$ what you're looking for is the Boolean modifier, I don't know if it will give a good result though as the topology will be messy $\endgroup$
    – moonboots
    Jul 16, 2021 at 16:54
  • $\begingroup$ I must say that I am really a beginner in Blender. When I selected both the sphere and the joined cones, then I do boolean modifier and apply it says "modifier is disable skipping apply" $\endgroup$
    – Edu39
    Jul 16, 2021 at 17:02
  • $\begingroup$ please share your file: pasteall.org/blend $\endgroup$
    – moonboots
    Jul 16, 2021 at 17:04
  • $\begingroup$ I think I did it. Could you confirm it? $\endgroup$
    – Edu39
    Jul 16, 2021 at 17:08
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    $\begingroup$ yes, Robin's method is the simplest, but my question was how did you create all your cones all around the sphere ;) I wonder how you were able to make them correctly placed $\endgroup$
    – moonboots
    Jul 17, 2021 at 19:49

3 Answers 3

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Select your sphere, go into the Modifiers panel, give your sphere a Boolean modifier with the cone object as Object, choose the Difference option, duplicate both the sphere and the cone object to keep a copy somewhere, apply the modifier (select the modifier, keep your mouse over the modifier and CtrlA) and it will work (delete the cones otherwise you'll think it hasn't worked):

enter image description here

enter image description here

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  • $\begingroup$ Thanks for the answer but i got an error message in red color: "modifier is disable, skipping apply" $\endgroup$
    – Edu39
    Jul 16, 2021 at 17:25
  • $\begingroup$ I think I need to have selected, in the object box, the "icosphere" ...which is now currently empty, but it does not appear when I click on the same box $\endgroup$
    – Edu39
    Jul 16, 2021 at 17:28
  • $\begingroup$ yes you need to select the cone object, not sure why you can't $\endgroup$
    – moonboots
    Jul 16, 2021 at 17:31
  • $\begingroup$ I will keep trying, but anyways I accept the answer. Thanks $\endgroup$
    – Edu39
    Jul 16, 2021 at 17:32
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Maybe better not to use a Boolean?

  1. Enable the shipped add-on: Geodesic Domes (There are other ways, but this is quick.)
  2. Create your dome:

enter image description here

  1. With I Inset, ('Individual' checked in its F9 Adjust Last Operation panel,) inset all its faces.

enter image description here

  1. Set your Pivot to 3D Cursor, and ensure the cursor is at the center of your dome. (It probably hasn't moved since the dome's creation)

  2. E extrude the still-selected inset faces, and right-click to drop the extrusion in place.

  3. S scale the faces toward the centre of the sphere.

  4. Assign Bevel and Subdivision Surface modifiers

enter image description here

You may wish to treat pentagonal faces differently.. you can select them with ShiftG, and select similar, by number of edges.

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  • $\begingroup$ Thanks for this. However I do not want a void inside the sphere, I think I will give it a try anyways $\endgroup$
    – Edu39
    Jul 16, 2021 at 17:36
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    $\begingroup$ @Edu39 You could Alt E > extrude the faces inwards along their normals, instead of deleting and solidifying $\endgroup$
    – Robin Betts
    Jul 16, 2021 at 17:47
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    $\begingroup$ you can extrude inwards as Robin says and scale down in order to give each hole a cone shape (you need to choose Pivot Point > Individual Origins), then merge by distance $\endgroup$
    – moonboots
    Jul 16, 2021 at 18:31
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    $\begingroup$ @moonboots Ahh, of course! Extrusion doesn't scale. Thanks! Another option: E extrude, right-click to drop, S to scale towards 3D cursor at center of dome.Will edit answer. $\endgroup$
    – Robin Betts
    Jul 16, 2021 at 18:44
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    $\begingroup$ @Edu39 Answer edited to your requirements. $\endgroup$
    – Robin Betts
    Jul 16, 2021 at 19:01
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Yes, I know that wasn't asked, but I just love Geometry Nodes :D

An Ico-Sphere is a good starting point here.

The node Dual Mesh converts points into faces (and vice versa), which gives you the basic shape.

You can then extrude and scale these faces to get the desired mesh without boolean operations.

The nice thing about this solution is that it is 100% procedural and you can change the parameters at any time.

enter image description here

And here is another variant with sharp edges:

enter image description here

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  • $\begingroup$ .. and no pentagons.. $\endgroup$
    – Robin Betts
    Jul 6, 2022 at 20:02
  • $\begingroup$ @RobinBetts ...there are a few, but well hidden ;-) I am not sure if they can be avoided with this shape as a base... $\endgroup$
    – quellenform
    Jul 6, 2022 at 20:54
  • $\begingroup$ @RobinBetts But the cool thing about it: if you have a basic shape without pentagons, just plug it in, because those are geometry nodes. ...But what I'm telling you, you're a pro. ;-) $\endgroup$
    – quellenform
    Jul 6, 2022 at 21:00

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