9

IES Sun Light (Photometric) 1311
3–1010), ray-traced shadows (page 3–1000),
advanced ray-traced shadows (page 3–1000),
mental ray shadow m aps (page 2–1360),orarea
shadows (page 3–911) to generate shadows for this
light.
Each shadow ty pe has a rollout with its associated
controls.
Tip: When you use the mental ray renderer
and mental ray shadow maps, you can set up
soft-edged shadows.
Use Global Settings—Turn on to use glo bal s ett ings
for shadows cast by this light. Turn off to enable
individual control of the shadows. If you choose
not to use the global settings, you must choose
which method the renderer will use to generate
shadows for this partic ular light.
WhenUseGlobalSettingsison,theshadow
parameters switch over to show you what the
current global sett ing is. This data is shared by
every other light of this class. When Use Global
Settings is off, the shadow parameters are specific
to that particular light.
Exclude—Excludes selected objects from the
effects of the light. Click this button to display the
Exclude/Include dialog (page 2–1335).
Excluded objects still appear lit in shaded
viewports. Exclusion takes effect only when you
render the scene.
Advanced Effects Rollout
Co ntrast— Adjusts the contrast b e tween the diff use
and ambient areas of the surface. Leave this set to 0
for normal con trast. Increase the value to increase
the con trast for special effects: for example, the
harsh light of outer space. Default=0.0.
Soften Diffuse Edge—Increasing the value of Soften
DiffuseEdgesoftenstheedgebetweenthediffuse
and ambient portions of a surface. This helps
eliminateedgesthatcanappearonasurfaceunder
certain circumstances. Default=50.
Note: Soften Diffuse E dge slightly reduces the
intensity of the light. You can counter this, to some
extent, by increasing the Multiplier value.
Diffuse—When on, the 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 an object’s surface. When off, the
light has no effect on the spe cular properties.
Default=on.
For example, by using the D iff use and Specular
check b oxes you can have one light color the
specular highlights of an object, while not color ing
its diffuse component, and then have a second
light color the diffuse component of the surface
while not creating specular high lights.
Optimizations rollout
This rollout is identical to the Optimizations rollout
(page 2–1361) for advanced ray-traced and area
shadows.