Version 2 of Cloud Shells has resulted in a complete rewrite. The macro 
structure has been abandoned in favour of a better user control. All 
transformations of the clouds are controlled by the density parameters. 
Note in particular the use of rotation and scale there. Another 
improvement, imo, is the uniform thickness of the cloud shells from 
zenith to horizon, in contrast to version 1. Also, it is possible to 
choose a clear horizon if that is called for by your scene. Extensive 
comments are added everywhere and all parameters can be changed by the 
user, so feel adventurous and play!

-- 
Thomas

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