Displacement/Height maps?!

[Amnesiaplayer]

I am quite finished with orginal amnesia now.
Now, I am more into custom things.
I am trying to make a lot of diffirent landscapes, and displacement/height map, is the only way for it.

I use CrazyBumb, and that creates norm, spec and displacement. (occlusion to)
But amnesia can't use displacement file, but instead, it only has the option "Height" without displacement.
I don't know how to create a height map, or where.
I have a displacement map, but that doesn't work.
So I thought, lemme do this on maya.
I added some subdivisions etc, Did something in Hypershade menu, and then, it worked.
atleast, in maya. I rendered it, it looks really cool. (this thing was a test, I was trying to make sand, look cool. Just to test out)
but then, in Modelview, It "checked" only "Diffuse" this means that displacement maps doesn't work on hpl2.
Is there a way to "change" a displacement file into Height?!
I really need it now...