Don't know about Louvre, but some museums definitely publish 3D models online. Europeana[1] in principle should be the one-stop place to find those from European museums, but still finding those is bit difficult now imho.

Sketchfab has a recent blog-post on their part: https://sketchfab.com/blogs/community/1-year-of-public-domai...

[1] https://www.europeana.eu/