Well I thought I`d get the background out the way before starting to texture this beast. But I`m having a little problem with my Earth.

I`m trying to get the rim glow that you get with the planet but its not working. I have 3 spheres 1)ground and sea, 2) clouds, 3) Atmosphere - the one not working.

Does any one know how to help me here.

https://www.ravage3d.com/images/sship/earth.jpg