Is it possible to get material that is applied to ladscape in specified location? So, for example, it could be used in shader that recognizes what material is applied below/next to object with that shader - and change his texture to the one from this landscape material. (Chameleon shader! 
) Proffesional visualization of the problem:
Hi,
You can LineTrace to find a physical material of a landscape. And then update render materail depending on a LineTrace result. Physical material can be assigned to a specific landscape layer object. Just open it in asset editor. When there are several layers blended together LineTrace should return material of most dominant layer.
Thanks, i will try this soon 