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108 Chapter 3: Selecting Objects
a head object (page 1–111).Thedefaulthead
object type is Luminaire (page 1–111).
3. Enteranamefortheassembly,choose
Luminaire (page 1–111) from the list, and click
OK.
The selected objects are assembled. The
assembly head object position and orientation
is determined as follows:
• If there are multiple immediate children
of the assembly head (for example, you’re
assembling several non-hierarchical
objects), the head object is aligned with
center of bottom face of the assembly
bounding box.
• If there’s only one immediate child of the
assembly head, the assembly head pivot
point is aligned with that object’s pivot
point. For example, if you’re assembling a
single hierarchy, the topmost object in the
hierarchy would b e the single immediate
child of the assembly head.
To define a nes ted ass embly :
1.
Select two or more assemblies or any
combination of assemblies and objects.
2. Choose Group menu > Assembly > Assemble.
The Create Assembly dialog appears. It requests
anamefortheassembly,andaheadobject.
3. Enteranameforthenewassemblyobjectand
click OK.
To wi re a h ead obj ect to a light sour ce:
1.
Create a hierarchy of lights and geometrical
objectsthatmodelsalightingfixture.Setsupall
the necessar y IK chains and other constraints
that make the model behave properly when the
user interacts with it (orients, positions, aims,
etc.).
Impor tant: For any photometric lights that
you want to control with the head object, be
sure to turn on the Multiplier check box on the
Intensity/Color/Distr ibution rollout.
2.
Select all objects in the fixture and define them
as an assembly.
When the assembly is selected, the luminaire
parameters Dimmer and Filter Color appear in
the Modify p anel.
3. From the Animation men u, choose Wire
Parameters > Parameter Wire Dialog.
4. The Parameter Wiring dialog (page 2–412)
appears.
5. On one side of the dialog, find the assembly
and expand the branch titled Object
(LuminaireHelper). Click the Dimmer item to
highlight it.
6. On the other side, find the assembly and
expand its hierarchy branch (click the + symbol
in the square box). Find and expand the branch
for the light s ource, and then expand its Object
branch. Click the Multiplier item to highlight it.
7. Between the two hiera rchy lists, click the
Control Direction arrow button that points
from the selected Dimmer item to the selected
Multiplier item.
8. If you’re wiring a photometric light, skip this
step. If you’re wiring a standard light, or any
light whose default Multiplier setting is 1.0, do
this:
• The Expression box below the selected
Multiplier item contains the word "Dimmer."