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I am trying to create single texture for multiple materials in substance painter according to this tutorial. https://www.youtube.com/watch?v=HMP2xpGHimY

I have two models made in Blender. One with several materials(for generating ID map), another with one material.

Mesh for ID map:

enter image description here

Main mesh:

enter image description here

Both are totally identical from geometry and scale standpoint.

Generating ID map settings(it is a mobile game so I use only Unlit texture and don't require other maps and channels except for BaseColor):

enter image description here

Painting the model with masks created with ID map and actual problem.

enter image description here enter image description here

Id map: enter image description here

Model's materials in Blender (everything is great here): enter image description here

How can I handle this issue?

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I have used unwrap on both meshes instead of Smart UV Project and have them reimported. It helped.

enter image description here

I believe it was some UV issue.

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