Slope Based Shader And Basic Displacement in houdini.

Slope Based Shader :
                 Dot product of Y axis and surface Normal ..gives a value between 0-1, which is fed to a ramp(to control the slope).

I have used an example of ..two shader (surfaceModel1 and 2), where the latter is basically the inverse of the first one.That means areas not covered by the first shader ll be covered with the first one.

Basic Displacement Shader:

Basic Network for Displacement.

I was getting an artifact in my render with this.
Increasing Displacement Bound or Going to  object node, Render tab - > Dicing tab -> Ray Predicing change to Full Predicing, Fixed this.

http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=28934