I faced a problem. Maybe someone can explain what I do wrong. Maybe I didn’t notice some settings or another little thing.
I made a sculpting Hi-poly model (In the end it was without animation or rigging).
Then I made low-poly in Retopoflow. Added seams for UV. And made smart UV project.
After that I exported Hi-poly (through FBX export build-in tool) model to the Substance painter, colored it and exported PBR.
I connected PBR to Hi-poly in Blender.
With an add-on Simplebake I baked Hi-poly PBR to Low-poly.
PBR on low-poly worked properly. After that I needed to export low-poly model in FBX format with embedded PBR textures (I know how to export with textures: export FBX, choose copy, press embedded).
To check I decided to import the FBX to Blender. Then I got this mess (see image). It was visible only in render mode and material preview. When I changed render mode from Eevee to Cycles. Problem stayed only in material preview mode.
I tried many variations of export settings.
Different Simplebake settings.
Checking my UV (it was only one).
Checking Normals side.
And all times I received the same mess when I import FBX back to Blender.
Moreover, I even imported this FBX to 3ds max, Unity project (in Substance Painter and Zbrush I imported the models without textures). In these all variations I received the model without this problem. The problem was only in preview mode after import.
I googled. Found just one-two users with the same problem.
After two evening of this experiments, I decided to try to import to the Blender with an add-on “Better FBX import”… Hah…and problem disappeared. But a new additional FDM folder appeared.
I’m using Blender not for long time, but I figured out a lot of basic things. Eventually, I want to use models for projects (like Unity or Unreal), maybe sell them on stocks. And I want to make sure this problem does not spoil anything in the future.