Thanks a lot for your the nice feedback and comments.
@Democles: Yes, the AI can build up bases as you can see in the video or on the screenshot. The Alien-bases are build by the AI. The AI-Build-up system is nearly finished, only some little things missing. The attack system is in progress, but still not finished.
@Friendly_Frank: Oh S..., did I really wrote fiend? I hope all of you understand the meaning of the sentence.
And now to your question. We use normal-mapping and you're right the rotation speed of the clouds and the planet is a little bit unrealistic, but it looks much better.
Bye G.S.