part of my model are see through

Question

Every now and then when I am working on a model this happens

them 2 part go see through when i import into UE4

Why has it become a different color and then when I import it into UE4 they are see through can i fix this or is this some sort of bug?

Make sure the normals of your mesh are pointing outwards, otherwise UE4 might not draw these faces because of backface culling. — maddin45, Mar 14 '15 at 15:19
recalculate normals : http://blender.stackexchange.com/a/15812/11431, http://blender.stackexchange.com/a/14922/11431 and http://blender.stackexchange.com/a/8325/11431 should help — Bithur, Mar 14 '15 at 15:20
Go into edit mode, select all vertices, and press Ctrl+N — J Sargent, Mar 14 '15 at 15:22

Bithur · Accepted Answer · 2015-03-14T15:49:09.950

This usally happens when normals are facing the wrong side of the mesh
enter image description here
Using the backface culling in the N panel will make the concerned faces transparent (see-through as in your UE4 game engine)

You can check your faces normals with this option in the N panel. This will show you the normals in the viewport.

To make the normals consistent go in Edit Mode with Tab, select all with A (only the bad faces could be enough), and use Ctrl+N (recalculate), or Shift+Ctrl+N (recalculate the other direction), or select the faces and click Flip directions
enter image description here

part of my model are see through

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