I faced this problem when i separated a model into three models.
In this scene I have three separated models (which If I merge them there is no space between them. In fact it was one mesh but I had to separate it.):
Face, Neck, Back of the head
I'm trying to fix the problem with the shading of these three.
There is a difference between neck and back of the head which makes this weird line!
Thank you in advance!
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$\begingroup$ blender.stackexchange.com/questions/105851/… $\endgroup$ – Alireza Farzaneh Jun 7 '20 at 19:21