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3D Tiles
glTF™ (GL Transmission Format) is a royalty-free specification for the efficient transmission and loading of 3D scenes and models by applications. glTF minimizes both the size of 3D assets, and the runtime processing needed to unpack and use those assets. glTF defines an extensible, common publishing format for 3D content tools and services that streamlines authoring workflows and enables interoperable use of content across the industry.
For more information, you can be visiting https://www.khronos.org/gltf/.
If the normal of the points is identical to the normal of the face, it is thus not obligatory to generate the normals, because iTowns will generate them, automatically, during the fetching/parsing.
If there are vertices with same position and same normal, use face index list, to reduce vertex and normals count.
Draco is a library for compressing and decompressing 3D geometric meshes and point clouds. It is intended to improve the storage and transmission of 3D graphics. Visiting github Draco.
Tools to converting/compressing 3D model to glTF Draco: