Displacement doesnt work


I have tried it many times but the displacement doesnt work.

Fehler - abload.de.

Please help me.

You need much more triangles. Change your preview mesh and your tessellation settings like this

Hi I did your settings but it only works with the sphere because it has more triangles, with the plane or other flat surface objects it gets too lowpoly. What can I do?

What´s your tessellation multiplier? It should be 16 or higher.
The plane or box is just a preview mesh. In the end your mesh in your scene matters.

Should the mesh in the scene have many polygons for displacement?
Also what about the landscape material?
Thanks for helps