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How can I know if the normals of an object are flipped or not? Because in version 2.8 both normals have the same color and I can't identify if it's a flipped normal, unlike the previous versions where there are two colors of the faces: white is a real object, while light purple is a flipped normal.

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    $\begingroup$ In 2.8 it's different now, to preview normals orientation you have to use Overlays menu and enable preview mode there. See blender.stackexchange.com/questions/119408/… $\endgroup$
    – Mr Zak
    Jul 18 '19 at 18:25
  • $\begingroup$ Both methods are available in Blender 2.8x. $\endgroup$ Mar 23 '20 at 23:22
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Go into edit mode

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Select the overlays drop down and click on the button shown in the picture below

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You will see blue lines in the direction the faces are facing

enter image description here

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An even faster way to quickly check is to check the box that says Face Orientation. It'll color any flipped normals to red from blue. enter image description here

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