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I use Subdivision Surface modifier. Some edges I want to leave sharp. As you can see on the screenshot, this action adds holes to the mesh.

What is wrong here and how to avoid this?

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    $\begingroup$ First thing select all in Edit mode and press M to Merge by Distance, if it does not work please share your file $\endgroup$
    – moonboots
    Commented Feb 7 at 19:36
  • $\begingroup$ Seems no effect. Here is the original file - file.io/TCRvgpnIPPIw $\endgroup$
    – Artem
    Commented Feb 8 at 6:37
  • $\begingroup$ Edge split is the second modifier, before the subdivision... $\endgroup$
    – lemon
    Commented Feb 8 at 8:24
  • $\begingroup$ @Artem your link doesn't work, please check if lemon is right or share your file again $\endgroup$
    – moonboots
    Commented Feb 8 at 9:21
  • $\begingroup$ @moonboots Sorry, reuploaded - disk.yandex.ru/d/KVGG-FFxaXyv-A $\endgroup$
    – Artem
    Commented Feb 9 at 16:58

1 Answer 1

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What you see is normal, you've given an Edge Split modifier to your object, by default it cuts the edges according to the desired angle between the faces, here you've enabled the Sharp Edges option so it takes only the edges marked as sharp into account. If you cut the edges and give a Subdivision Surface to the object it will round the edges and therefore it will show holes. To fix the problem, deactivate the modifier, or explain why you are using it in order to find another solution.

enter image description here

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  • $\begingroup$ I'm a bit confused, how to make it without using Edge Split? Subdivision Surface ignores edges marked sharp - ibb.co/h7Cr05L . As far as I understand, I need to manually make small bevel for needed edges. Any other solution without breaking mesh? Also please take into account that I use old Blender version 2.79, because more recent versions don't work on my computer. $\endgroup$
    – Artem
    Commented Feb 12 at 15:05
  • $\begingroup$ How to make what exactly? If you want round or sharp edges, bevel them and choose a width that fits your need? $\endgroup$
    – moonboots
    Commented Feb 12 at 15:07

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