(Oops misread. you said source code. Perforce.) Most project I know use perforce to store a few terabytes of art data and the game project. Another project us

(Oops misread. you said source code. Perforce.) Most project I know use perforce to store a few terabytes of art data and the game project. Another project used Google Drive for the same purpose. Some groups built entire platforms https://sketchfab.com https://sketchfab.com (Epic Games) or https://github.com/nuxeo-archives/nuxeo-platform-3d https://github.com/nuxeo-archives/nuxeo-platform-3d (Electronic Arts) Cesium3D uses 3d tiles and storing the data tables inside of the gltf 3d asset.