Generally,
the workflow is as follows:
- Make sure that at least one light source
in the scene emits photons.
See
Turn on photon emission for a light source.
- Make sure that at least one surface is
casting or receiving caustics.
By default, all objects
cast and receive caustics, though typically not all have to in order
for you to achieve the look you want. To fine-tune the look of global
illumination or caustics or to reduce render times, you can specify
exactly which objects should cast and, or receive photons. See
Flag objects to cast and receive photons.
TipTo see the distribution
of photons for global illumination, you can generate a 3-dimensional
visualization map in shaded or wireframe scene views.
- Make sure raytracing and the desired
global illumination and, or caustic effects are enabled.
See
Render with global illumination.
- Render with mental ray for Maya.