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Water is a box, only surface noised, physical sky+sun on both renders.
There are no shadows on water, and it seems that caustics tend to appear with dielectric water, wich are too strong with plastic.

I'll make tests with a sun emitter.

Why does the water appear curved near the right end of the image. I mean, shouldn't it be straight across?

[EDIT] I guess it's the shadow that appears wrong. ???

I hoped you won't see it , it's quick modeled

Use a plane instead of a box for the water... And try increasing uv roughness on the plastic to sooth those caustics.

Thx, i've applied your tips!

I tried for the first time an emitter for sun, but i can't have hard shadows

Next render is on his way

uv=0,2 is too much
And no caustics anymore (i tried with uv=0 but nothing)

Same render with dielectric water is on its way

Here it is: 9H, 17.53 samples

How to do hard shadows with a sun emitter?

put the emitter further away from the scene, and make it small like 0,5 m....

nice.....what are you using for bump, a map or is it modeled that way ?

:: i think it is modeled that way...
how strong is your sun?::

right, it's a segmented plane with 2 noise modifiers, and physical sun

i'll make tests tonight with emitter

I like the wall map...where'd you get it?

Dielectric plane water, emitter sun
14h35, 18.71 samples, and still white dots
Leveled in photoshop
I found the bitmap on the net

you know what would help to sell the baby...

try painting a water mark on the wall... like a darker ciment... or better a different surface with plastic to cast spec. where the wall is supposed to be wet... because the water is slightly moving so it discover some wet wall at each wave...

yep and let a piece of gras or a leave swim on the surface:)