To simplify things, I've added the Roboto font to the project to avoid the 'font not found' problem. Tested on Windows and Linux (Ubuntu 20.04).
I corrected another bug: before, on Linux the font manager don't found the installed font.
This bug is now fixed on the new release OGLCScene v2.1
https://github.com/Lulu04/OGLCScene/releases/tag/v2.1Thanks ginoo and Thaddy for your comments!

Below the new version of the Christmas demo