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I know the problem was already seen and discussed, but i want to be sure that in this case is not my mistake and is a real displacement actual limitation of Octane.

I need to realize a "realistic" snow, so I have my mesh (see in attachment the scene) that is not planar and where is really difficult to make an UV mapping.
I've tried a hundred of solutions (textures, phong angle, mid level,...) but I have always the same problem: broken polygons.

So I ask and enclose the scene to see if someone could give me some tips in order to resolve.

Hi Luca,
with a such dense mesh, it does not give any advantage to use the Octane displacement.
Look at what you obtain if you use the same map in the displacer deformer: You should reduce a lot the mesh to take advantage of Octane displacement, in my opinion.
ciao beppe