**System Information**
Operating system: Windows 10 64 Home
Graphics card: GTX 1080Ti
**Blender Version**
Broken: Version 2.80 Beta e7356bb01198, 2019-07-02 13:31
**FBX exporter, Select-Object, apply 'remove doubles' and change the vertex normals of the surface.**
**Exact steps for others to reproduce the error**
Based on this file enclosed here, export it as FBX with both ‘normals only’ and ‘edge’ smoothing.
Open it in Painter:
The FBX exporter is recalculating **custom** normals or applying to remove double vertices when exporting?
Somehow exporting FBX from Blender the vertex normals are imported bad in Painter. So looks like is a Substance Painter side,
but is not the case because the exact same file exported from Rhinoceros3D FBX is importing correctly in Substance Painter.
This means that communication between Blender and Painter is not working well.
I submit the same bug to Substance Painter. Please talk to each other.
ref:bug-21e1321f
For example, the OBJ instead is working fine.
Consider in the FBX user interface a boolean to toggle it off (so that vertex normals are preserved).
Enclose you will find screenshots of the vertex normal direction FBX file exported from Blender, Blender FBX, Rhino FBX, Blender OBJ.
{F7617894}