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I have modeled a simple pocket watch in Blender. Every time I import it into Unity3D, regardless of whether I export it from Blender as an FBX or 3ds file, it always comes out missing faces! Why is this happening? I have never had problems importing models into Unity3D like this before.

Blender Screenshot

Blender

Unity Screenshots

enter image description here enter image description here

It seems to me that different faces appear when I rotate it differently. How can I prevent this? Thanks!

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migrated from stackoverflow.com Jun 28 '13 at 20:44

This question came from our site for professional and enthusiast programmers.

  • $\begingroup$ Have you tried just using the .blend file? $\endgroup$ – Noctrine Jun 28 '13 at 19:53
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    $\begingroup$ If you're using ngons, convert them to quads or tris first. $\endgroup$ – jesterKing Jun 28 '13 at 20:54
  • $\begingroup$ what direction are your face normals pointing at in blender? $\endgroup$ – zeffii Jun 28 '13 at 21:21
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This looks like you have flipped normals.

Blender draws double-sided by default, but you can enable Backface Culling in the Display panel (one of the panels right hand side of the view-port).

You can also enable drawing normals which draws a line in the direction each face points.

So you can use either of these draw options to check which way your normals are flipped.

This could be...

  • Normals flipped the wrong way in Blender, you can select all in editmode and run 'Mesh -> Faces -> Recalculate Normals' (CTRLN). OR if they are all the wrong way around: you can simply flip the normals. 'Mesh -> Faces -> Flip Normals')
  • Negative scale on the object. Blender detects negative scaled objects and shows the faces pointing the right way, but many game engines will show normals flipped if you have a negative scaled object.
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  • $\begingroup$ Flipping the normals worked great! $\endgroup$ – Keiran Paster Jun 29 '13 at 16:55
  • $\begingroup$ Thank you my scales were negative causing issues, wondering why just one object was going wrong in the scene! $\endgroup$ – Martin Sykes Oct 26 '15 at 19:30

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