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these edges have different normals I think.how can I fix it so they have the same normals? (without converting to curve ...) please check the blend file. thank you. enter image description here

Answer 1 : for closed shapes, you can turn on calculate order in screw modifier. but this is not working on open shapes.

enter image description here

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  • $\begingroup$ Looke here: blender.stackexchange.com/questions/259611/… $\endgroup$ Commented Apr 15, 2023 at 11:29
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    $\begingroup$ The top one is correct with the normals facing outwards. For the bottom one, click one of the verts, hit Ctrl-L to select all of it then Alt-N > Flip to flip the normals. $\endgroup$
    – John Eason
    Commented Apr 15, 2023 at 11:31
  • $\begingroup$ @JiříHonzák thanks. i was looking for a faster way. i need this for many objects imported from CAD. $\endgroup$ Commented Apr 15, 2023 at 22:21
  • $\begingroup$ @JohnEason thanks, i already try that. but it's not working. $\endgroup$ Commented Apr 15, 2023 at 22:22
  • $\begingroup$ You'll need to share the Blend file in that case so that someone can have a look. Share it via blend-exchange.com following the instructions on that page. $\endgroup$
    – John Eason
    Commented Apr 15, 2023 at 22:39

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