Hi,
I have created two Ico Spheres, with one inside the other. The outer sphere uses a (projected) texture map of clouds:
http://www.shadedrelief.com/natural3/pages/clouds.html
I have also created a texture map that uses alpha, instead of black.
The idea is to have the white clouds cast a shadow on the inner sphere. (To simulate clouds on Earth.)
I have read the following pages:
http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes/Shaders
Outer sphere node setup:
How would you make the clouds appear and cast shadows on the Earth?
Thank you!
P.S.
Blender 2.60a (with Cycles).