whoops, sry you're right ^^ I was in my "I've got 4 points so it must be 4 polys"-Mood ^^
Another quick thing. I created some test normal map:

But when I apply it to Stage1_Normal in ModelView I get some strange results like this one:

I tried switching the Lightning Mode and adding lights, but none of them seem to work

Thank you very, very much!
Philipp