Caustics trick !!

[bouhmidage]

Goooood morning guys !
so i'm working on a house project, i did this swimming pool render, instead of creating realistics water material with caustics enabled, i used a caustics map mixed with tile mao using corona mix map.
in real life, there is no caustics in the surface out of direct sun light, so i need a trick to show caustics on corona mix only when direct light comes in other worlds, hide caustics map on shadow area !!
is that possible, any trick ?
if it's not  it may be on wishlist ! Map visiblity accordig to light : direct, indirect, shadow, refraction ....
Thanks :D

[iancamarillo]

why not project the map with a light?

[SHORT CUTS]

Is it a still image? you might get away with rendering your water without caustics and again with caustics and mask it in ps. had this yt tutorial in my feed yesterday, not exactly what you are loking for but might give you some ideas.

compositing starts at 4 minutes