Black surface in render view I have a wall for which one I have applied a displacement modifier with the cloud texture. In the picture below you can see the wall in the solid viewport.



When I try to catch the coordinate of the wall in the ColorRamp shader I get the walls like if they were inverted. One side is correct whereas the other one seems inverted...
Can you help me ? Why do I have this wall inverted in my Rendered view ?





EDIT : 

The wall's normal vectors are in the correct direction
You're using a color ramp output in a normal input. That cannot work. 
If you intended to use it as a displacement map, use a vector displacement node with the displacement input of your material output.