Quote Originally Posted by Brainer
Thanks for useful hints. I'm going to write some code now using your and mine ideas. I'll let you know later about the result - I'll post the code then.

.: EDIT !! :.
I did some changes, but I don't know why my "favorite" error occurs (line 26. :?
http://www.glsoftworks.pastebin.com/f5051d109
Most likely it's related to
Data.Heights[X, Y]

And as i said, displaylist doesnt gonna help you, especially when you're goint to edit the terrain, displaylists is static by nature. Use vertex arrays as in you last code instead.