I have OSM data (2D) data from Geofabrik now i need 3D building data for my study. I found one web server where i got OSM 3D buildings https://osmbuildings.org. Now i need to either crawl this data and convert it into json file which i can use it in QGIS. Anyone having idea how i can get this kind of 3D building data which i can fetch it in QGIS.
.osm.pbf data from Geofabrik conatins ALL OSM data, including the 3D information to render the buildings.
The only thing that is not incorporated is elevation data of the Earth surface. You would need SRTM or similar if you want that rendered too.