Z = > Y is right on the money.    :)  

Displacement is for the mat only. I do not know if modifying the terrain the way i did can be considered a form of displacement?

Also i wish i can do more extreme forms of displacing the terrain like what i used to do in Terragen 2 but the more displacement i use, the more Vue 6 has a difficult time dealing with this feature. E-On really needs to optimize this feature as it was easy and fast in Terragen.