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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


marked as duplicate by cegaton, Shady Puck, Community Sep 18 '16 at 20:26

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  • 1
    $\begingroup$ 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) $\endgroup$ – cegaton Sep 18 '16 at 18:57

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