Hello
Actually, I tried to implement what was described at https://wiki.openstreetmap.org/wiki/Bridge3D
But I must admit that it does not work on this:
https://demo.f4map.com/#lat=43.4971050&lon=-1.4821933&zoom=19&camera.theta=44.158&camera.phi=30.94
If you have better, I am ready to use it.
Thanks
Alexandre