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Editing a mesh for a while I didn't notice that I created a n-gon. After adding a subsurf modifier the mesh heavily deformed, it took while until I found this:

enter image description here

Is there an easy way to select n-gons?

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Yes.

Press 3D view > HEader > Select > Faces by Sides:

enter image description here

Then set the type to greater than and the number of vertices to 4 in the redo panel (F6 or at the bottom of the tool shelf):

enter image description here

Edit Blender 2.8

This option is now in Select > Select All by Trait > Faces by Sides Select faces by side blender 2.8

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  • $\begingroup$ You have to deselect your model using "a" before you do that when you model is currently entirely selected, else the N-gons will not be visible because the model is already entirely selected. $\endgroup$
    – tmighty
    Aug 24, 2015 at 21:40

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