In my iOS app, I have a set of planet maps as images, some as large as 14k resolution. I can apply downsized versions to spheres to create models of planets in SceneKit. 
However, I want users to be able to zoom in to see details on the full resolution images. I also want to be able to do this without my app running out of memory.
Is there a way to automatically tile textures to a sphere like Google Maps does, and only load the parts and resolutions when they are needed?