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Can you tell me what Subdivide problem is?
I combined the models in one. Select all A in Edit mode, then I split the surface with Subdivide. Some surfaces does not want to divide.

Thanks in advance!

enter image description here

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    $\begingroup$ can you provide the file? $\endgroup$ – Crantisz Dec 9 '18 at 8:56
  • $\begingroup$ With the bridge edge loops it can be possible. Delete the mark faces and the side faces. With the top and the bottom faces press space bar and type bridge edge loops. Then you can sub-dived and add extra loops. Yes if file is provided maybe you get a detail answer. $\endgroup$ – atek Dec 9 '18 at 10:03
  • $\begingroup$ Also be sure you have all vertices connected (select all and -> W -> remove doubles) $\endgroup$ – Jan Kadeřábek Dec 9 '18 at 14:12
  • $\begingroup$ @Crantisz File here: dropbox.com/s/wdv4xn7tlyuan3q/knights_subdivided.blend?dl=0 $\endgroup$ – Marcell Dec 9 '18 at 15:18
  • $\begingroup$ @Marcell First, you have many unconnected vertices - select all and hit W->Remove Doubles. Also your mesh consists of n-gons and with such uneven geometry, you cannot expect any regular subdivision. So you I am pretty sure you have to clean model's geometry (use CleanUp function - dissolve, triangulate etc.) before you can subdivide it nicely. $\endgroup$ – Jan Kadeřábek Dec 9 '18 at 16:27
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This vertexes prevent face from subdividing, because this is n-gon (more than 4 vertexes on one face), N-gons cannot be subdivided.

enter image description here

To remove them do this (with original model before subdividing):

  1. Select one of this vertexes
  2. Press Shift+G -> Amount of adjacent faces
  3. Then X -> Dissolve vertexes

After you clean model, you can subdivide it.

If it doesn't helps, remove excess vertexes manually

You need to fix another problem on your mesh, see also: Why are some faces in my mesh darker?

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  • $\begingroup$ Thank you for the tips! And thank you for a link (my mesh darker). I found the problem. $\endgroup$ – Marcell Dec 10 '18 at 7:07
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Here is the solution:
Because of many edges, can't create subdivision.

  1. Select problematic edges (Edit Mode)
  2. Press DEL -> Limited Dissolve
  3. Subdividing and done!

Thanks for your supporters!

how subdividing

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