Orientation issue loading vtk mesh

[alixchcl]

Operating system: Linux
Slicer version: 4.11.0 (-2020-03-03)
Expected behavior:
Actual behavior:

Hi, I am trying Slicer new version, and I encounter orientation problems while reading vtk meshes. The following segmentation is supposed to match the thalamus.

However, one of my colleague is using Slicer version 4.11.0-2020-01-18 on Mac OS and does not encounter the same trouble, loading exactly the same files.

Would anyone know what is happening there ?

Thanks a lot in advance!

[lassoan (Andras Lasso)]

We have updated Slicer-4.11.0 on 2020-02-26 to consistently save all data in LPS coordinate system and assume all data to be stored in LPS coordinate system by default. See details in this post:

Model files are now saved in LPS coordinate system

While Slicer uses RAS coordinate system internally, images, transforms, and markups files are stored in LPS coordinate system, because DICOM and all medical image computing software (maybe except a few very old ones) uses LPS coordinate system in files. However, Slicer has been still using its internal RAS coordinate system in mesh files (STL, VTK, VTP, OBJ, PLY), which caused issues when interfacing with third-party software. Starting from tomorrow (Slicer-4.11.0-2020-02-26, revision 28794), …

If you have any remaining questions or concerns then please post them here.