Despite the limit of 50mb per model uploaded on Sketchfab’s free service, you are able to get a surprising number of Tris within that limit. My Lyme Regis example below has 1.6million!
Flown imagery sourced from Bing, and DEM generated from Defra data.
Looks like Sketchfab are pushing the streaming tech with their new ‘MASSIVE‘ service allowing for 80million Tris+. Obviously this is on a paid service given the underlying models will be huge.