8

Caustic Lighting Effects 91
Decreasing the f-stop to narrow depth of field
Focal plane set at the nearest apple, and f-stop set to 0.1.
Increasing the f-stop to b roaden depth of field
Focal plane in sam e location, f-stop increased to 1.0.
Yo u s e t t h e f - S t o p i n t h e c a m e r a’ s D e p t h O f F i e l d
rollout. See
Depth of Field Parameter (mental ray
Renderer) (page 2–1227)
.
Note: For Perspective viewports, which have no
camera, the Render Scene dialog > Renderer panel
>
Camera Effects rollout (page 3–100) has explicit
Focus Plane and f-Stop settings.
Caustic L ig hting Effe cts
Caustics are the effects of light cast onto an object
viareflectionofforrefractionthroughanother
object.
Swimming pool rendered without c austics
Reflective caustics added to swimm ing pool
To calculate caustics, the mental ray renderer uses
the
photon map technique (page 3–1088) .(Ray
trac ing can’t generate accur ate caustics, and they
aren’t provided by the default scanline renderer.)
You enable caustics on the Render Scene dialog >
Indirect Illumination panel >
Caustics And Global
Illuminat ion rollout (page 3–104)
. In addition,
you must designate:
• Which light objects can create caustics.
• Which renderable objects can generate caustics.
• Which renderable objects can receive caustics.
The settings for generating and receiving caustics
are on the Object Propert ies dialog >
mental ray
Panel (page 1–121)
.