You
can use the decay region manipulators to set decay regions interactively on
a spot light. (Alternatively, you can enter exact distance positioning
in the Attribute Editor. See
Decay Regions attributes.)
The decay regions indicate
the regions you want to light and the regions you don’t want to
light in the shape of three truncated cones. Use the decay region
manipulators to precisely indicate these regions.
TipWhen interacting
with the spot light to get precision lighting for distance dimension,
adjust the scene view so that it is perpendicular to the spot light
icon, making it easier to see the distance effect head-on.
To interactively set decay regions
- Make sure the Use Decay Regions attribute
is turned on.
To turn on the decay
region manipulators, see
Show, hide, or resize a light manipulator.
- Click the Index Manipulator until
you can see the decay regions on the spot light’s icon. (To learn
more about the Index Manipulator, see
Show, hide, or resize a light manipulator.)
- Drag the decay region rings to set start
and end distances. If you want, you can verify and fine-tune these
values in the Attribute Editor.
TipWhen Interactively
setting a light’s decay regions:
- Leave the Attribute Editor open
and IPR render the scene so you can make changes interactively to
get the look you want.
- Apply a Light Fog (click
the box next to Light Fog in the Light
Effects section of a spot light’s Attribute
Editor) to see the results.