Export with Y as elevation, a different scale, and opposite winding for faces

[Kirjaissa]

When importing in the 3d software in which I do the rendering , I always need to do those three things from a geometry exported in STL from FreeCAD
1/ flip the normals, which is related to the way the triangles are built
2/ scale to 0.1 % -- FC seems to be working in mm, while the other 3d software works in m.
3/ rotate 90 degrees around the x-axis (x axis as seen in the target)

Is there a way to get rid of some or all those operations ?

[Shalmeneser]

When importing in the 3d software in which I do the rendering ...

Which one ?

[Kirjaissa]

When importing in the 3d software in which I do the rendering ...

Which one ?

I'm not changing the units and the orientation in the target software. Maybe I'll do it in numpy-stl after it's written and before importing.

[jeno]

When importing in the 3d software in which I do the rendering , I always need to do those three things from a geometry exported in STL from FreeCAD
1/ flip the normals, which is related to the way the triangles are built
2/ scale to 0.1 % -- FC seems to be working in mm, while the other 3d software works in m.
3/ rotate 90 degrees around the x-axis (x axis as seen in the target)

Is there a way to get rid of some or all those operations ?

1/
I can't remember that I had problems with the normals in Blender except the underlying model was broken. Can you post a model or stl-file which cause problems in your target software.
2/
stl is dimensionless. There is no wright or wrong. It is just interpretation of the given data. Maybe your software has an scale-option for stl-import.
3/
Most CAD-software follows the -Y forward and Z upward paradigm whereas some 3D graphics software uses the Z forward and Y upward. Probably this is due to the fact that some interchange formats like FBX or glTF also follow this paradigm. Again, maybe your target software also offers an import option. By the way: FBX and glTF are also based on meter als base unit.

cheers