8

Exclude/Include Dialog 1179
Tip:
Use ray-traced or advanced ray-traced shadows
when you want shadows cast by opacity-mapped
objects. Shadow-mapped shadows don’t recognize
the transparent p ortions of the mapping, and as a
result they don’t look con vincing.
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
global settings are. This data is shared by every
other lig ht of this class. When Use Global Settings
is off, the shadow parameters are specific to that
part icular light.
Exclude button
Excludes selected objects from the effects
of the light. Click this button to display t he
Exclude/Include dialog (page 2–1179) .
Excluded objects still appear lit in shaded
viewports. Exclusion ta kes effect only when you
render the scene.
Roll Angle Manipulator
To change the roll angle of a target light, you
canuseamanipulator. Thiscanbeusefulif
the lig ht does not cast a round b eam, or if it is
a projector light (see
Advanced Effects Rollout
(page 2–1185)
). To display the manipulator, selec t
the light, rig ht-click it, and then click Roll Angle
Manipulator Toggle in the Tools 1 (upper left)
quadrant of the quad menu.
Roll angle manipulator on a target lig ht
Drag the circular portion of the manipulator to
rotate the light by an arbitrary number of degrees.
Click one of the red or green “clock hands ” of
the manipulator to rotate the light in 90-degree
increments.
Note: You c an also access the roll angle manipulator
by selecting the light object a nd then turning on
Select And Manipulate (page 2–26) on the main
toolbar.
Exclude/Include Dialog
Create a light. > General Parame ters rollout > Exclude
button
Rendering menu > Render > Render Scene dialog >
Render Elements panel > Render Elements rollout > Add
button > Render Ele m ents dialog > Select an existing
Matte element in the list. > Matte Texture Element rol lout
>Includebutton
The Exclude/Include dialog determines which
objects are not illuminated by a selected light, or
which objects are considered in a
Matte render
element (page 3–126)
.
Although light exclusion does not occur in nature,
this feature is useful when you need exact con trol
over the lighting in your scene. Sometimes, for
example, y o u’ll want to add lights specifically to
illuminate a sing le object but not its surroundings,