It works for me, thank you!

Hi @maxGimeno

there is another problem with our surf reader and the input file I gave you.
The file is read and the demo displays the polyhedral surface, but inside out, and the console displays :

732 vertices
1 patch(es)
The patch #0:
  -inner region : material's id = 0 material's name = Exterior
  -outer region: material's id = 1 material's name = Material1

Can you please make sure "exterior" corresponds to "outer region"?

The input file explicitly define the inner region as "exterior" :/

Actually the file defines :

InnerRegion Exterior
OuterRegion Material1

so the inconsistency is in the input.
Let's keep it this way, thank you!

Successfully tested in https://cgal.geometryfactory.com/CGAL/testsuite/results-5.1-Ic-133.shtml