I'm trying to create a layer of clouds over my spherical planet. I am 
using a combination of wrinkles and onion patterns. I can scale the 
onion pattern to the thickness of the clouds, but I am not sure how to 
align the start of the onion to the surface of the planet.

E.g.

The planet radius is X units. The clouds start at X + M units and end at 
X + N units. What is the correct way to create this onion? Do I need to 
use frequency and phase modifiers?

Thanks.


Mike

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