Autodesk LIGHTSCAPE, Manual

Page: 173 / 362

Illuminating Your Model with Daylight
165
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6.
Select a city that approximates the location of
your model from the Location list.
After you select a city, Latitude and Longitude values
are automatically added in the appropriate boxes.
7. If the desired location is not available, select
None from the Location list, then enter Latitude and
Longitude values in the appropriate boxes.
8.
Click OK or Apply to accept the settings.
Setting the Time
Once you have set the location of your model, set
these parameters to calculate the effect of daylight at
a specific time of day during a specific time of the
year.
To set the time of day:
1. Choose Light | Daylight.
The Daylight Setup dialog appears.
2.
Disable Direct Control.
3. Click the Place tab and set the location and ori-
entation of the model. For more information, see
“Setting the Location and Orientation” on page 164.
4.
Click the Time tab.
5.
If you specified Latitude and Longitude values
on the Place page explicitly, enter a Time Zone value.
This value must accurately reflect the position of the
model on the Earth.
6.
Enter a Month, Day, and Time in the corre-
sponding fields.
You can specify a Time value based on a 24-hour
clock, or you can use A.M. or P.M.
7. If applicable, enable Daylight Savings.
When Daylight Savings is enabled, Time values are
calculated using daylight savings time and are
adjusted forward or backward one hour, as
appropriate.
8.
Click OK.
Setting Daylight Processing
Parameters
The default processing settings in the Daylight Setup
dialog provide high-quality final images, but not the
fastest computation times. By modifying these
settings you can specify how you want light from the
sun and sky to behave during the radiosity
processing.
Cast Shadows
Use this option to make sunlight or skylight cast
shadows. When this option is disabled, radiosity
processing is much faster.
Casting shadows considerably reduces the number
of calculations required for a solution, so it is a quick
way to get a general feel for the lighting characteris-
Model placed in Oslo, Norway at 10 a.m. on June 21