Fresnel is the right word. I’m using it for the reflections so that they are more pronounced the lower the angle you look at the water. The volumetrics is done the way you said (I think) with a box at every light, textured with a gradient. Or do you mean that he can do it in-engine?
I will most definitely post the final result here when it’s done. All that is left at the moment is to add a nice texture to the floor and a better ceiling texture. Bonus features would be normalmaps for everything, plants hanging from the ceiling, better paintings for the walls and maybe a statue in the middle of it all 
I think most people either don’t know how to get their stuff into a game engine, are too lazy to do it or think that a render looks better so why bother with realtime. Who knows 




Plants are something I want to put in there, but it will take some time as I don’t have a tablet at the moment and no time to model at home :sad: Work takes up a lot of time what with GDC around the corner.