@PogoP: Check out Virtuosic's tutorial in 3dmotive, Chris Albehuln's tutorial and the GDC Example Map has a vertex blend material you can mess around with. Also check out the Unchartered 2 Snow and Ice thread for more information. EDIT: If memory serves me correct UDK terrain works in a different way. Though wouldnt hurt…
Ah, i bit late on the note, rage uses megatexturing, which basically is a huge huge huge texture with everyplace beeing uniqely handcrafted. You can't really do a megatexture unless you go with the quake 4 tech. (you can use it with the editors following QW:ET ) I did a odd tutorial on how to use vertex blending using…
I think you should ask this user for tips on terrain texture blending. http://www.polycount.com/forum/showthread.php?t=74720 You should also check out This UDN tutorial on the subject
Precise terrain is hard... The closest I've come to this is painting a high bit depth displacement texture in Photoshop and Mudbox. The texture needs to be a high bit depth to avoid stair stepping artifacts. I ended up working from large forms down to smaller details. All the while testing the displacement texture on the…