8

1184 Chapter 15: Lights and Cameras
2.
On the default main toolbar, click to
turn on Select And Manipulate.
Now when you move the mouse over the
hotspot or falloff circle, the circle turns red
to show you can adjust it by dragging. Also,
a tooltip displays the spotlight name, the
parameter, and its value.
3. Drag the hotspot or falloff circle to adjust the
value.
The hotspot and falloff constrain each other, as
their spinner controls do.
Spotlightmanipulatorsaredescribedattheend
of this topic.
To set the shape of the light beam:
1.
Choose either Rectangle or Circle.
Theshapeofthelight’sconechangestoreflect
the shape you chose.
2. If you chose Circle, you are done. If you chose
Rectangle, you c an now adjust the
aspect ratio
(page 3–1005)
of the rectangular lig ht in the
Aspect field.
To change a rectangular light’s aspect ratio:
1.
Choose Rectangle, as described above.
2. ChangetheAspectvaluetotheaspectratiothat
you want.
The Bitmap Fit button is another way to set the
aspect ratio. It is mainly used with projec tions.
Interfa ce
Light Cone group
These parameters control
hotspots and falloff
(page 3–1048)
for spotlights.
Show Cone—Turns display of the cone on or off.
Note: Theconeisalwaysvisiblewhenalightis
selected, so turning off this check box has no
apparent effect until you deselect the light.
Overshoot—When Overshoot (page 3–1082) is
set, the light casts lig ht in a ll directions. However,
projections and shadows occur only within its
falloff cone.
Hotspot/Beam—Adjusts the angle of a light’s
cone. The Hotspot va lue is measured in degrees.
Default=43.0.
For photometric lights, the Beam angle is the
angleatwhichthelight’sintensityhasfallento50
per cent of its full intensity. (As opposed to the
Hotspot, where i ntensity is stil l 100 per cent.)
Fa lloff/Field—Adjusts the angle of a light’s
falloff. The Falloff value is measured in degrees.
Default=45.0.
For photometric lights, the Field angle is
comparable to the Falloff angle. It is the angle at
which the light’s intensity has fallen to zero.
You can manipulate the hotspot and falloff by
drag ging manipulators in viewports, as described