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mental ray Indirect Illumination Rollout (for Lights) 1343
Projector Map group
These controls make the photometric light a
projector.
Che ck box—Turn on to project the map selected by
the Map button. Turn off to turn off projection.
Map—Names the map used for the projection.
You can dr ag from any map specified in the
MaterialEditor,oranyothermapbutton(ason
the Environment panel), and drop that map on
the li g ht’s Map button. Clicking Map displays the
Material/Map Browser. You can choose the map
type using the Browser, then drag the button to
the Material Editor, and use the Material Editor to
select and adjust the map.
mental ray Indirect I llumination
Rollout (for Lights)
Create panel > Lights > Create a li ght. > Modify panel >
mental ray Indirect Illumination rollout
Note: This rollout does not appear on the Create
panel.
The mental Indirect Illumination rollout provides
controls for light behavior with the mental ray
renderer (page 3 –78). The settings in this rollout
have no effect on rendering with the default
scanline renderer, or on advanced lighting (the
light tr acer or a radiosity solution). T hese settings
control how the light behaves when it generates
indirect illumination; that is, caustics (page 3–92)
and global illumination (page 3–93).
Tip: By default, each light uses the global settings
that are found in the Global Lig ht Prop erties group
on Render Scene Dialog > Indirect Illumination
panel > Indirect Illumination rollout (page 2–1343).
It is more convenient to adjust all lights in the
scene at once. If you need to adjust a specific light,
you can use the multiplier controls for energy and
photons. In general, you should rarely if ever need
to turn off Use Global Settings and specify local
light settings for indirect illumination.
Impor tant: In addition to the values specified here,
the light must also be set to generate caustic s, global
illumination, or both. These con trols are on the mental
ray p anel (page 1–126) of the Object Properties dia log.
You also need to turn on Caustics, Global, or both, on
the Render Scene dialog’s Indirect Illumination rollout
(page 2–1343).
Interfa ce
Automatically Calculate Energy and Photons—When
on, the light uses the global light settings for
indirect illumination, r ather than local settings.
Default=on.
When this toggle is on, only the controls in the
Global Multipliers group are available.
Global Multipliers group
Energy—Mu lt iplies the g loba l Energy v alue to
increase or decrease the energ y of this particular
light. Default=1.0.
Caustic Photons—Multiplies the global Caustic
Photons value to increase or decrease the count of