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I have two separate objects that I want to join together, both with no modifiers and applied transformations/scales, but when I join them I get the shading on the model starts to look weird.

These are the two separated objects

Object 1

Object 2

And these are the objects joined together. Is there a way to fix the strange shading that occurs here? Thanks

Joined Objects

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2 Answers 2

Reset to default
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It looks like one of the objects was originally smooth shaded while the other was not. Select the joined object in object mode, Right Click and select Shade Smooth from the menu. Then go to the Properties editor → Object Data Properties and open the Normals panel and select Auto Smooth.

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  • $\begingroup$ The model in the last image of my post is smooth shaded and has auto smooth enabled, I probably should have stated that in the post. $\endgroup$
    – Ishadd
    Jan 10, 2022 at 2:46
  • $\begingroup$ It sometimes happens that if you join a mesh that is not smooth shaded to a mesh that is that not all of the polys become smooth shaded. Did you apply smooth shading after you joined the meshes? $\endgroup$
    – Marty Fouts
    Jan 10, 2022 at 3:35
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    $\begingroup$ Both meshes had smooth shading before I joined them $\endgroup$
    – Ishadd
    Jan 10, 2022 at 3:53
  • $\begingroup$ Then please share your blend file in your question (How to add a blend file) $\endgroup$
    – Marty Fouts
    Jan 10, 2022 at 14:42
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Try resetting the normals of the joined object. In Edit Mode, press: Shift+N or go to object menu Mesh > Normals > Recalculate Outside

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