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I am trying to make a uv lantern for substance painter use, but I keep running into problems. enter image description here

enter image description here

this is uv map of this lantern After separating the seams, I encounter gaps in the SP, it looks like a hard joint, but without separating into seams, it does not work out to make the correct UV map.enter image description here

enter image description here uv without manually specified seams (I used the smart uv project function)enter image description here I would be very grateful if someone could tell me what to do. maybe someone can suggest good guides for creating uv? I certainly found a few videos on YouTube, but they are all very superficial and almost useless.

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First , I see some Overlapped UV islands (may I wrong because of image size).

Second , you should use a checker map to check your UV

enter image description here

enter image description here

then in Substance painter for some materials and texture coordinate you should change Projection on UV or Tri-Planer

enter image description here

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