Hi! Good to hear, 3dmr.eu is alive.
GLB-Files are a good improvement. Many of the uploaded models have been GLB originally.
www.f4map.com is using models too; but closed source, respective locked for download. But how could I find them in the browser cash?
My www.OSMgo.org is also using the 3dmr.eu and I may help testing your work.
There are two use cases:
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Some models are unique like the Eiffel Tower. The position parameters aren in 3dmr. I once made a small editor for positioning models and get the parameters, in A-Frame. If you like, we could include it in the web site.
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Others are used many times, like a lantern or a power mast. The coordinates have to be in the OSM tagging and need an OSM Wiki page.