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I stumbled upon a weird problem while modelling a wall of a building. I started with a plane, then added windows by subdividing faces (Ctrl+R) and using insets (I). Then I dissolved some edges that didn't seemed important for my model. However after dissolving them, faces started to look weird/glitchy, like they were overlapping. Apart of that, I can't select separate faces, feels like something is covering them. That's a bit counter intuitive for me since i'm working with a 2d plane so it should be impossible for faces to overlap.

When I try to extrude, I get a sort of copy of plane, not the actual extrusion.

All this makes further work on this model impossible and forces me to rollback a few steps, which isn't a big deal, but I'd like to understand what causes this issue to avoid it in future.

I would be grateful if someone more knowledgeable could explain it to me. Please take a look at the video in the link to see what the problem looks like.

problem with 'overlapping' faces

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    $\begingroup$ Try Remove Doubles and search here for Z-fighting. $\endgroup$ – cgslav Sep 18 '16 at 17:52
  • $\begingroup$ ye it seems as you have overlapping faces....Remove double might or might not work if it doesnt you should try and find yourselft what is happening $\endgroup$ – xlxs Sep 18 '16 at 18:00
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    $\begingroup$ Related links for Black artifacts / Strange shadows / Some faces are black or darker than others: - Z fighting caused by overlapping geometry, remove doubles (Alternative answer here) $\endgroup$ – user1853 Sep 18 '16 at 18:57

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