Hello everybody. If in 3D max forget to move the overlapped shells to UV and save the model(Photo 1), then when you reopen, the overlapped shells in UV will "merged" together and they cannot be selected separately + the cut lines on the model in the viewport will disappear or partially disappear (Photo 2).I didn’t work at…
This used to happen to me ages ago, usually after a weld operation. You can separate them by selecting the face geometry for one side in the viewport and in the UV Editor right click and select "Detach Edge Verts". If you have only 1 object selected, with 1 unwrap modifier does this return false:…