There is no buoyancy system in there. It could be something I add in the future. It it designed at the moment as an artist placement tool and Material that responds to the environment. The good thing is that the mesh is there to do tracing against which could be used in a buoyancy system. The hard part would be if the material is used to do big swelling waves then the shader/texture is not able to be used from the physics system. This means that currently, a relatively flat river could be done but more complicated waves wouldn’t really work.