Exporting a segmentation as a .stl generates the normal vectors backwards (inside-out)

[egravante]

(Running ITKSnap Version 4.2.2 on Windows)

Unfortunately, when exporting a segmentation as a .stl surface mesh, the normal vector that defines the "inside" and "outside" of the faces of the mesh is backwards. This leads to some weird compatibility issues when trying to read the files in other programs like GMSH.

This can be visualised in Blender.
File > Import > file.stl
Select "Show Overlays" in the top right corner of the window (the icon is two circles and not visible in edit mode), then check the "face orientation" box.

All of the red faces should be on the inside of the mesh.

Here is what it should look like: (fixed in Blender)

Thank you!

[pyushkevich]

Could you please share the segmentation file to help recreate?

[egravante]

Yes absolutely!
R1053_Segmentation_NoBones.zip

[pyushkevich]

Fixed in commit e6af460