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What's happening is that I have tried to flip the normals, inside and out, but there are always faces which have to be flipped!

Normals recalculated Normals re calculated

Inside View

Inside view

If I flip them again, all faces get flipped and end up horrible and, not working at all. So how can I make all of the faces flip to the right direction?

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I think this is problem you are having: some of the normals are always facing the wrong direction.

If you have the whole mesh selected when you flip normals then you are just toggling between the backwards faces and the correct faces, what faces are backwards. You are flipping the whole mesh, the correct parts will become backwards.

With the whole mesh selected Recalculate the normals ( ctrlN ) that should fix the problem.
If recalculating the normals does not fix it, then you will have to go through your mesh and select only the faces that are backwards then flip normals.

I think you want the inside of the scope to point towards the inside. That is a case where Recalculate will probably not work. If the inside cylinder is unconnected from the rest of the mesh, then just hover the mouse over the inner cilinder and press L.

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  • $\begingroup$ Yes , I had to flip the normals which werent flipped correctly because no other solution wasnt working! , It was quick though ( i used ALT P to select the circle of faces ) $\endgroup$ – Knuckles209cp Jun 13 '14 at 8:58
  • $\begingroup$ ctrl N for me seems to want to make a new document. $\endgroup$ – Trejkaz Dec 28 '17 at 8:16
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    $\begingroup$ @Trejkaz you have to be in edit mode. $\endgroup$ – David Dec 28 '17 at 13:56
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You can use "make normals consistent" enter image description here enter image description here

To find out which direction ther normals are pointing at you can enable "normal" in the mesh display tab.

enter image description here enter image description here

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I guess you ticked backface culling in the Options Panel N in section Shading.

enter image description here

Check your normals again with the Normals display option ticked.

This image shows a cube with a single face removed, the normals should all point outwards. due to the deleted face all the faces with normals pointing backward are hidden. The faces with normal pointing in to the viewers direction are displayed.

The materials also have a backface culling option (in game mode).

enter image description here

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  • $\begingroup$ Nope , that doesnt fix it :l $\endgroup$ – Knuckles209cp Jun 12 '14 at 9:12
  • $\begingroup$ @Knuckles209cp add more details if this doesn't help consider to upload the file. $\endgroup$ – stacker Jun 12 '14 at 9:19
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Select the entire model by pressing, A then Ctrl+N to change the normals to face out.

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