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When editing a mesh, it sometimes happens that two faces are seemingly connected by an edge, but these are actually two edges on top of each other. Often enough I only notice this way later. For example when moving one of the faces, revealing the hole in the mesh.

In Maya there was an option to highlight border edges. Does Blender has something similar?

Or this there another workflow in Blender to detect gaps?

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  • $\begingroup$ would an wire frame help? here is a link to a tutorial youtube.com/watch?v=kAaToapgBxQ $\endgroup$ – triplex Oct 30 '19 at 18:34
  • $\begingroup$ A screenshot (or a gif of mesh close-up revealed) probably could help since "these are actually two edges on top of each other" seems like simple removing doubles would be enough. There is selecting borders tool, select all and run Boundary Loop from Edges menu. $\endgroup$ – Mr Zak Oct 30 '19 at 19:55
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Did you mean check non-manifold?

Type select non manifold in search-bar (F3 or Space) in verts select mode(edit mode) when selecting nothing.

It will help you to select something not manifold including separated holes

enter image description here

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  • $\begingroup$ This is a neat feature, how come it’s not listed in any menu? Or am I just blind? $\endgroup$ – Jachym Michal Oct 30 '19 at 18:49
  • $\begingroup$ This is a very handy function, and quite close to what I'm looking for. I tried it and as expected it will select a lot more parts than just border edges. $\endgroup$ – mic Oct 30 '19 at 18:54
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    $\begingroup$ @mic.. It's under (Header) > Select > Select All by Trait > Non-Manifold. It's also worth checking the options in the operator, to narrow the selection. $\endgroup$ – Robin Betts Oct 30 '19 at 18:55
  • $\begingroup$ Thanks for the tip. I’m gonna be using this a lot :) $\endgroup$ – Jachym Michal Oct 30 '19 at 18:56
  • $\begingroup$ Please don't just add thank you as a comment, upvote the answer instead. If you feel it completely solved your problem consider marking it accepted $\endgroup$ – Duarte Farrajota Ramos♦ Oct 30 '19 at 18:58
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A quick option is sometimes Select Similar in Edge Mode. Select an edge known to be on a boundary to nothing, and ShiftG > 'Amount of Faces Around an Edge' to select the others.

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  • $\begingroup$ So I need to have a border in order to use this function. Other than that this is what I'm looking for. Is there something like 'select border edges'? $\endgroup$ – mic Oct 30 '19 at 19:00
  • $\begingroup$ @mic it's one of the check-box options in Select Non Manifold as described in the other answer. The settings will persist on repeat usage, in any one session, until you change them. $\endgroup$ – Robin Betts Oct 30 '19 at 19:06
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There is a Blender way to solve this.
You can merge edges that are too close together.

Go to Edit Mode.
Select all vertices of your model through Select->All
Go to Mesh->Clean up->Merge by distance

You can also adjust the distance, or select only a part of your mesh.

enter image description here

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  • $\begingroup$ This is actually what I'm using when I'm sure it does not remove anything I want to keep. But it does not really visualize the problematic points. $\endgroup$ – mic Oct 30 '19 at 18:51
  • $\begingroup$ You’re right. The solution by @Hikariztw is way better. I just had no idea Blender can do that. $\endgroup$ – Jachym Michal Oct 30 '19 at 18:54

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