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If this option is active, lines protruding from every face corner in the mesh will be drawn in the direction of the [link=surface_normal]surface normal[/link] at that location. If normals are discontinuous across connected faces, multiple lines may emanate from the same location. Normal lines are scaled relative to the total area of the face they belong to.

See also [link=show_face_normals]Show Face Normals[/link].