WIP - Intertidal environment

Quick test for an intertidal (between low-tide and high-tide sea levels) ecosystem rendering. The ground was acquired with my smartphone in Keremma ([right here](https://goo.gl/maps/T6feJa3mwiF2)), and I just added a simple refractive plane to give the impression of some (not so nice looking) water. I'm not sure of the way to go for the environment of this scene: create it from scratch by kitbashing and scanning some props as with this ground texture, or create a highly detailled-scan of an interesting location containing rocks, seaweeds, crustaceans... that I would later re-texture and improve upon. I guess that only some more tests will help me decide !