Setting Photon Rendering Options
Location: The Render Manager > Renderer > GI and Caustics
or
The Render Manager > Globals > mental ray > GI and Caustics
You can activate caustics and global illumination, and control their rendering options from the GI and Caustics tab of the mental ray Render Options property editor.
For a full description of caustics and global illumination effects and their rendering options, see Global Illumination and Caustics in the Lights and Cameras guide.
SOFTIMAGE|XSI v.6.01