Everything related to Maxwell Render and General Stuff that doesn't fit in other categories
By Theophile Dufresne

Is it possible to have a pass with only the caustics ?
If there isn't a proper way maybe with some kind of hack ?

Thanks for any help !

By luis.hijarrubia
Try selecting refractions in render channel and in global illumination go to Illumination and caustics and select the proper options depending on your scene.

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where is maxwell studio?

Its a separate purchase