Thermals have no effect on cloud generation, also the cloud rotation is a static effect. But wind speed determines the shape of the cloud systems, as the wind speed increases the clouds will elongate into a realistic pattern just as in real life. We decided to tie into the default weather engine since I didnt see a need to reinvent the wheel here..... I have a control in the UI to adjust the cloud rotation, since this is a static effect I wanted the user to have some control over this. Not everyone is going to like it Also users will be able to drop their own sky colors into the plugin, I did this for Tom K since he is never happy (but seriously he is the reason why I added that feature) There are already a bunch of nice sky colors out there and this is a subjective topic.... Here is an early look at the UI: