There are just a few settings to get caustics to render properly in mental ray. But if they aren’t on, you’ll never get caustics. So how do you get caustics to work in mr?
•You have to have a object that reflects
•You can’t get reflections without a light source, so you need a light in your scene
So with these in mind let’s look at the settings:
•If you’re using the A&D material, be sure to make it reflective. If it doesn’t reflect it won’t create your caustics.
•To create the actual caustics effect, in the render settings, under caustics and GI, be sure Enable under caustics and GI is checked. It’s not enough to have Enable under caustics. Mental Ray actually uses photons to fake the caustics, that’s why caustics render so quickly in mr.

Note: if you are using transparent materials to generate caustics, check the advanced options in you’re A&D shader and use Refract light and generate Caustics effect.
You have not only to turn on Caustics in your Object Properties but ALSOW in LIGHT Properties to get it work.:)
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