Quote Originally Posted by etriahn View Post
I may be a bit off, but I believe that drop-down holds the answer you're looking for.
And you were right, good sir! Thank you for the help! Afterwards it seems clear, that the Grass layer is the key to create the bump map. It doesn't have any other function. Well, I guess I was blind but it's really good to know this great community that makes the blind see again! Thanks, Etriahn!