This document discusses techniques for generating and caching 3D tiles for large-scale 3D visualization on the web. It introduces WebGL and OpenWebGlobe, an open-source virtual globe project using HTML5 and WebGL. Tiles are used to efficiently stream only the visible data to the client, similar to 2D maps but handling different levels of detail and elevation. Standards like 3D Portrayal Service and glTF aim to optimize 3D data transmission for rendering on the web. The document compares different tile types and data sources and concludes that the computer graphics and geospatial communities need to work together on 3D standards.