Strange shading when joining two objects?

Question

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

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

hello could you please share your file if Marty's answer didn't work? https://pasteall.org/blend/ — moonboots, Jan 10 '22 at 08:47
A little late, but this may help solve your problem, it did for me. https://blender.stackexchange.com/questions/39646/what-does-it-mean-when-my-angle-setting-under-auto-smooth-greyed-out — Rowen99, Jul 27 '22 at 08:30

score 2 · Answer 1 · answered Jan 10 '22 at 01:43

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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.

answered Jan 10 '22 at 01:43

Marty Fouts

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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. – Ishadd Jan 10 '22 at 02:46
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? – Marty Fouts Jan 10 '22 at 03:35
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Both meshes had smooth shading before I joined them – Ishadd Jan 10 '22 at 03:53
Then please share your blend file in your question (How to add a blend file) – Marty Fouts Jan 10 '22 at 14:42

score 0 · Answer 2 · edited Dec 23 '22 at 02:00

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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

edited Dec 23 '22 at 02:00

Harry McKenzie

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answered Dec 23 '22 at 01:06

EthanTheDominator

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Strange shading when joining two objects?

2 Answers2