Help with caustics

[Liberti0723]

Hi, guys!
I need help with the caustic .I’ve never worked with it. I Read several forums, all solutions are there in my case do not work, probably I do not understand something. For water I use box with noize on bump and standart parameters in material. When I am using bidir all begins gradually black. And it's no matter which mode bidir I use the result is still terrible. I attached two images 1. Render engine: progressive 2. Render engine:Bidir/VCM
Please help me)

[jjaz82]

Hi Liberti
In Bidir/VCM try to change mode to VCM.

[Liberti0723]

Hi, jjaz82!
Thank you for your answer.
But I already tried to change it and the result is black image.
I don't understand what is wrong

[Nekrobul]

Try simplifying scene for the caustics. Only water all the rest midgray difuse material an light sorces that should produce caustics.

[romullus]

You may want to check this tutorial: https://forum.corona-renderer.com/index.php/topic,5431.0.html

[Liberti0723]

romullus, thank you so much!!!)))
This tutorial is very useful! As fo me I got a good result. Soon I'll show it here.

[romullus]

How cool is that, Boris will be very pleased that his tutorial was useful! :]