Projected caustics from water overhead

[art3mis]

Just a quick question about how you would approach recreating this effect of sunlight projecting through a overhead pool of water and throwing caustic effects on the walls and floor.

For the caustics effect would you actually create a shallow pool of moving or rippling water overhead with a strong spot or distant light source above?

The screen grab is from the latest Blade Runner 2049 trailer.

 

Thanks for any feedback!

 

 

[animatrix]

You can fake it using point clouds:

 

[art3mis]

Thanks!