8

396 Chapter 5: Creating Geometry
you can access its creation par ameters (time
and date, location, orbital scale, and location)
in the Motion panel for the directional light.
The parameters are interrelated, so you can
adjust them in any order. Generally, it’s easiest
to choose a location first, and then adjust the
date and time. You can access the parameters
forselectedsunlightorskylightobjectsinthe
Modify panel. The radius of the compass rose
is als o editable from the Modify panel, after
selecting the compass rose object.
If Date/Time position is selected the Sun
and Sky multipliers are automat ically set and
animated according to their position. They can
be edited only by using the Manual Position
override.
Tip: UseExposureControlwithDaylightifyour
scene rendering is too bright or too dark.
Exa mple: To create a shadow s tudy:
1.
Create a Daylight system.
2. OntheModifypanel,setthedateandLocation.
Note: Once the Daylight system has been
created, you can find these controls on the
Motion panel.
3. Turn on the A uto K ey button.
4. In the Control Parameters Time group, adjust
the Hours spinner to a start time in early
morning.
5. Click the Go To End button.
6. Animatetheendtimetolateafternoon.
7. Render to an animation from a Top view, or a
view above your scene to get a complete view of
your environment and its shadows.
Interf ace
Daylight Parameters rollout (Daylight system
only)
The Daylight Parameters rollout lets you define
the daylight system’s sun object. You can set the
sunlight and skylight behaviors.
This rollout appears on the Modify panel when the
light component of the Daylight system is selected.
Sunlight—Select one of three options for sunlight
in your scene:
•
IES Sun—Uses an IES Sun object (page 2–1163)
to simulate the sun.
•
Standard—Uses a Tar get D ire c t li g ht (p a ge
2–1145)
to simulate the sun.
•
No Sunlight—No sunlight is simulated.
Active—Turnssunlightonandoffintheviewport.
Position group
Manual—When on, you can manually adjust the
location of the daylight assembly head object in
your scene, as well as the intensity value of the
sunlight.
Date, T ime a nd Location—When on, uses the
geographically correct angle and movement of the
sun over the earth at a given location.