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I need all my normals to be oriented in the same angle, but as you can see from my screenshot, the outer edge are turned one way and the inner edge are 90º offset, so I'm just wondering if there's a way to manually turn them?

enter image description here

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    $\begingroup$ Press Ctrl+N or use the operator Flip Normals $\endgroup$ Commented Dec 18, 2016 at 5:00
  • $\begingroup$ @DuarteFarrajotaRamos - I don't think that "flip normals" is what he means, although there isn't any other method to rearrange normals $\endgroup$ Commented Dec 18, 2016 at 5:27
  • $\begingroup$ Correct, I know how to flip normals, it's the rotation I was wanting to change so that the X and Y axes faced the same direction. $\endgroup$
    – Danial
    Commented Dec 18, 2016 at 7:04
  • $\begingroup$ There is no other possibility to manipulate normals in blender than flipping them. Maybe you could explain a little more in detail what exactly your problem is? $\endgroup$ Commented Dec 18, 2016 at 7:15
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    $\begingroup$ You could use particle system's settings In order to orient hair. E.g. to make them growing in the Z direction regardless normals set Normal in the Velocity rollout to 0 and set value of the Z axis under the same rollout > Emitter Object to something more than 0. $\endgroup$
    – Mr Zak
    Commented Dec 18, 2016 at 11:37

3 Answers 3

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By definition the face normals are perpendicular to the face and can't be adjusted to a specific rotation.

To alter the way the hair is emitted, you want to use something other than the normals to determine the initial direction, you can adjust this in the particle settings.

Enable the advanced option which makes the velocity panel available for hair particles. Set the normal value to 0.0 and change the emitter object values to the direction you want the hair to go.

particle options

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You can use a different, invisible, flat panel to act as hair emitter

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The darker parts seem to have inward facing normals.
With these parts selected hit Ctrl+N. If that doesn't fix them Shift+Ctrl+N probably will.

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