Landscape tessellation using texcoords

Development Rendering
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I have a material that i use only for my landscape and i have set up tessellation for it using absolute world position

http://i.imgur.com/nsb2sCl.png

. I tried replacing the absolute world position node to texcoord and the my ground was not changing height

http://i.imgur.com/XK733dW.png

, it was only being tessellated

http://i.imgur.com/oQqORLB.png

. Why world displacement is not working with texcoords? My Tessellation function looks like this:

http://i.imgur.com/7KDkQaT.png

[Album] imgur.com

And i also have to set a way larger scale while using texcoord.