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Basically I want to create this kind of effect in a cylinder surface, I tried doing it with cylinders + array to create multiple desired holes but does puts a lot of pressure in the program due to the mesh, that's why I'm trying to make fake holes

However, I don't want it to be completely a hole, if not to be a hole that goes inside and creates kind of a inward bump across the entire object. I recently found Voronoi but I've found all guides to be only for grayscale objects or the holes are not with bumps

How can I achieve this kind of effect or which would be the tools name?

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  • $\begingroup$ Hello, you say that you want to do it on a cylinder but you're actually showing a sphere? Also, do you want to fake the holes with a material (with a Bump node) or do you want real holes? $\endgroup$
    – moonboots
    Commented Jul 13, 2023 at 11:01
  • $\begingroup$ hey, yeah, it would be fake holes because real ones are making the program run slow and crash $\endgroup$
    – Omaren
    Commented Jul 13, 2023 at 11:02
  • $\begingroup$ Are you trying to make a trypophobia simulator? $\endgroup$ Commented Jul 13, 2023 at 21:14

2 Answers 2

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You can use the black/white factor of a Voronoi Texture node (randomness = 0) to control the alpha channel of a principled shader. The Math node, set to "greater than", controls the size of the holes:

enter image description here

With a Bump Node connected to the Normal input of the Principled BSDF (instead of the Alpha input), you can fake a displacement effect:

enter image description here

NOTE: For best results, you should UV unwrap the cylinder first. For deeper holes, you will need true displacement and a higher resolution mesh, or bake normal maps...

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  • $\begingroup$ the way I was trying used way more nodes, tysm! just wanted to know if there's a way to make the holes to not completely cut through the mesh, keeping a little bit of volume as the image (2) it doesn't needs to have a bevel $\endgroup$
    – Omaren
    Commented Jul 13, 2023 at 12:44
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    $\begingroup$ Use normal bump instead @Omaren $\endgroup$ Commented Jul 13, 2023 at 12:51
  • $\begingroup$ True. I added this in the answer. $\endgroup$
    – LaserLars
    Commented Jul 13, 2023 at 13:00
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    $\begingroup$ I think at this point you should make yourself familiar with some shader tutorials on youtube. It's definitely possible and it's not that hard to do - but it's getting a little off-topic here :-) $\endgroup$
    – LaserLars
    Commented Jul 14, 2023 at 7:40
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    $\begingroup$ I see, thanks for the clarification tho, thanks a lot for the help! $\endgroup$
    – Omaren
    Commented Jul 14, 2023 at 10:44
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You could create a hole, bake the normal map (or the bump map), use the normal map on your cylinder. Of course the holes can't be very deep as these are fake holes:

enter image description here

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