3D tiles question

Hi, are the 3D tiles already loaded into Cesium, or do you have to download/buy them. Also how to enable them?

Cesium has a 3D Tiles loader built in but does not ship with or load any tilesets by default. If you have a 3D Tileset or a link to one you can load it in Cesium. There isn’t a central repository of tilesets.

For example, https://cesiumjs.org/NewYork/ contains a link to download the tileset for New York buildings. Then there are tools like ContextCapture that generate 3D Tiles through photogrammetry.