3d circle map rayshader

Hi everyone,
does someone has a solid experience with rayshader? I want to make a similar one but for my home city. But have no idea, where to start. This is a small piece of information an author provided on reddit:
openstreetmap , rendered in #rayshader rstats maps
the trick is to make a globe with very thin walls using two spheres, one slightly smaller than the other, with the index of refraction of the smaller one set to 1 (empty space).
image

I do not know if I ask fro too much, but it would be amazing if someone could make a video tutorial.

I cannot believe there is nobody who's fluent in rayshader:(

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