hey,
Can someone tell me how i use height maps in UE4? i know that they are should be connected to the world displacement slot but what other nodes are necessary to make the material look good? Are they any samples ?
Hi Adik,
You can find information on World Displacement with your heightmap here.
This is in the Content Examples from Marketplace > Open Map > Material Nodes.
This will also give you this example so you can play around with it. 
If you have any other questions feel free to ask!
Thank you!
Tim
If you open up the ContentExamples project and open the material node level, there is an example using bricks that are displaced pretty intensely, to the point where there are artifacts but it is to make it exaggerated and obvious. Keep your displacement relatively subtle, and if you get little triangle stretchy artifacts, it can be helpful to overlay and blend blurred versions of the displacement together since softer forms tend to read MUCH better than high frequency or busy forms.
(Edit, for some reason I did not see the above answer when I posted my redundant answer).
Thank you very much guys!