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I have been given a geometry like the one in the picture but find that although it is a building, there appears to be holes in the façade...

Fig1. Full building

Is there any way of making sure there are no holes (see below) in it apart from looking at it very carefully and making faces?

Fig 2. A hole

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you can use the 3d print toolBox :

  • press Ctrl+Alt+U
  • go to Addons and enable 3d print toolBox and save the settings

enter image description here

  • in the 3D view switch to Edit mode and select your mesh
  • use the Non-Manifold operator ( press T to show the tools panel ) enter image description here
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  • $\begingroup$ Another great add-on for mesh checking is MeshLint: wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Modeling/MeshLint $\endgroup$ – Johnson Martin May 29 '15 at 12:38
  • $\begingroup$ Thank you for this! It shows an aweful lot of holes! Is there a way of correcting these automatically? E.g. if the vertices are not that far apart? $\endgroup$ – HCAI Jun 1 '15 at 12:53

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