8

mental ray Indirec t Illumination Rollout (for Lights) 1187
Note:
Soften Diffuse Edge reduces the amount of
light, slightly. You can counter this, to some extent,
by increasing the Multiplier value.
Diff use—When on, t he light affects the diffuse
properties of an object’s surface. When off,
the light has no effect on the diffuse surface.
Default=on.
Specular—When on, the light affects the specular
properties of a n object’s surface. When off, the
light has no effect on the specular properties.
Default=on.
For example, by using the Diff use and Specular
check boxes you can have one light color the
specular hig hlights of an object, while not coloring
its diffuse area, and then have a second lig ht
color the diffuse portion of the surface while not
creating specular highlights.
Ambient Only—When on, the light affects only
the ambient component of the illumination. This
gives you more detailed control over the ambient
illumination in your scene. When Ambient Only
is on, Contrast, Soften Diffuse Edge, Diffuse, and
Specular are unavailable. Default=off.
The effect of Ambient Only isn’t visible in
view por ts. It appears only when you render the
scene.
A: Affec t specular only
B: Affect diffuse only
C: Affect ambient only
Projector Map group
These con trols make the photometric light a
projector .
Che ck box—Turn on to project the map selected by
the Map button. Turn off to tur n off projection.
Map—Names the map used for the projection.
You can dr ag from any map specified in the
Material Editor, or any other map button (as on
the Environment panel), and drop that map on
the light’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 Illumination
Rollout (for Lights)
Create panel > Lights > Create a light. > Modify panel >
mental ray Indirec t Illumination rollout
Note: This rollout does not appear unless you have
enabled the mental ray ex tensions by using the mental
ray Preferences panel. In addition, the mental ray renderer
must be the currently active rende rer.
Note: This rollout does not appear on the Create
panel.
The mental Indirect Illumination rollout provides
controls for light behavior with the
mental r ay
renderer (page 3–77)
. The settings in this rollout
have no effect on rendering with the default
scanline renderer, or on advanced lighting (the
light tracer or a radiosity solution). These settings
control how the light behaves when it generates
indirect illumination; that is,
caustics (page 3–91)
and global illumination (page 3–92) .
Tip: By default, each light uses the global settings
that are found in the Global Light Properties group
on Render Scene Dialog > Indirect Illumination
panel >
Indirect Illuminat ion rollout (page
2–1187)
. It is more convenient to adjust all lights