Overview
The Caustics group of attributes controls the emission of photons, used to render caustics effects.
The Caustics group
Enable Caustics
Turning this attribute on will render a one-pass caustic map.
Number Of Photons
Specifies the number of photons in the caustic map. It is available only when Enable Caustics is turned on. The default number of photons is 50 000.
Number Of Bounces
Specifies the maximum number of specular and diffuse bounces allowed when rendering the caustic map.The default number of bounces is 10.