9

1332 Chapter 15: Lights and Cameras
The light w il l now cast shadows when you
render the scene.
Note: With Overshoot turned on, standard
spotlights cast light in al l directions but cast
shadows only within the falloff cone; stand ard
directional lig hts cast light throughout the
scene, but cast shadows only within the falloff
area.
Left: A spotlight’s projection cone truncates shadows.
Right: An omni light casts complete shadows.
To have a li ght use the globa l settings for s hadows:
• On the General Parameters rollout, turn on Use
Global Sett ings.
When Use Global Settings is on, the other
shadowcontrolsaresettothevaluesusedbyall
other shadow-casting lights in the scene that
have Use Global Setti ngs set.
Changing the affected parameters for one light
with Use Global Settings set, changes them for
all lights with Use Global Settings set.
To set a light’s shadow par ameters individually:
• On the Ge neral Parameters rollout, turn off Use
Global Sett ings.
The sett ings revert to the individual sett ings
for the light.
By default, Shadow Map is the active shadow
type. In the Shadow Map Par ams rollout (page
2–1363),thedefaultsettingsare:MapBias=1;
Size=512; Sample Range=4.0; Absolute Map
Bias=Off.
Scene with shadow-mapped shadows
Shadows rendered using default parameter settings
Note: When you render a scene, you can turn
rendering of shadows on or off.
To cast area shadows:
• On t he General Parameters rollout, choose
Area Shadows from the drop-down list.
Use controls on the Area Shadows rollout (page
2–1357) to adjust the shadow properties.
To cast advanced ray-traced shadows:
Advanced ray-traced shadows are similar to
ray-traced shadows, however they provide
control over antialiasing (page 3–907),lettingyou
fine-tune how shadows are generated.
• On t he General Parameters rollout, choose
Advanced Ray-traced Shadows from the
drop-down list.
Use controls on the Advanced Ray-traced
Params rollout (page 2–1356) to adjust the
shadow properties.
To cast shadow-mapped shadows:
1.
On the General Parameters rollout, choose
Shadow Maps from the drop-down list.
2. Go to the Shadow Map Params rollout (page
2–1363).