Buildings should be like some islands in your mesh.
As indicate in the manual, if you have a closed line (hard or soft) it will be considered like and island and by consequence not meshed
For the background image, geotiff is possible and once again it's really well explained in the manual!
Conclusion: read the manual is a good pre requisite before using a software
Christophe
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Great news: The next TELEMAC User Conference will be organised by Bangor University on the 15th and 16th of October 2025, at the School of Ocean Sciences in Menai Bridge, on the Isle of Anglesey, Wale [ ... ]