8

IES Sky Light (Photometric) 1165
Each shadow type has a rollout with its associated
controls.
Tip: When you use the mental ray renderer
and mental r ay shadow maps, you can set up
soft-edged shadows.
Use Global S ettings—Turn on to u se g loba l s ettin gs
for shadows cast by this light. Tur n 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 particular 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 Glob a l
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 2–1179) .
Excluded objects still appear lit in shaded
viewports. Exclusion ta kes effect only when you
render the scene.
Advanced Effects Rollout
Co ntrast—Adjusts the contrast between the diffuse
and ambient areas of the surface. Leave this set to 0
for normal con trast. Increase the value to increase
the contrast for special effects: for example, the
harsh light of outer space. Default=0.0.
Sof ten Dif f use Edge—Increasing the value of Soften
DiffuseEdgesoftenstheedgebetweenthediffuse
and ambient por tions of a surface. This helps
eliminateedgesthatcanappearonasurfaceunder
certain circumstances. Default=50.
Note: Soften Diffuse Edge 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 diff use 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 specular propert ies.
Default=on.
For example, by using the Diffuse and Specular
check boxes you can have one light color the
specular highlights of an object, while not coloring
its diffuse component, and then h ave a second
light color the diffuse component of the surface
while not creating specular high lights.
Optimizations rollout
This rollout is ident ical to the
Optimizations
rollout (page 2–1206)
foradvancedray-tracedand
area shadows.
IE S Sky Li ght (P hotometri c)
Create panel > Systems > Create a Daylight system in
your scene. > M odify panel > Daylight Parameters rollout
> Skylight > IES Sky
Create panel > Lights > Photometric > IES Sky
Create menu > Lights > Photometric > IES Sky
IES Sky is a physically-based light object that
simulates atmospheric effects on
skylight (page
3–1106)
.