How to get caustics instead shadows using vraymtlwrapper?

[Dario Arnaez]

For many years I still using vraymtlwrapper to get shadows in a transparent floor to mount on any image in Photoshop. Now I'm rendering some glass objects with caustic effect on the floor. How can I get the caustic effect in a transparent floor?

 

Thank you so much who knows the answer. I tried many times but no result by the moment.

[cg_Butler]

I'm confused at to what you want. Sorry! Could you post some example images?

[spunk91]

If it's only for one picture, then you can pretty quickly render in out on a white background, and then photoshop it.

I did so for a similar project, and i could not figure out the same problem, how to render out caustic on a matte background.

[cg_Butler]

Can you not use the VRayCaustics element to capture our caustics and then use that post production?

[Ricardo Eloy]

Or you can save the image in PNG format and have the ground not affecting alpha. Reflections, shadows and even caustics casted onto the ground should appear over the transparency.