How to merge two objects in edit mode without shading and UV errors? So I've been modelling a club chair and i need to connect these two together without causing shading errors:



I tried merging vertices, but it causes shading errors which cannot be fixed via edge split and subsurface and would most likely impact the texture quality:



None of the other suggested other questions really answer what i need, any way i can merge these two parts together without shading issues?
The best way to merge those two mesh is by using a Edge Loop to connect them together. That way you avoid all the shading and UV errors.