Apple Motion 4 User Manual
Page 1229
In the next example, the image on the left contains a light with Intensity set to 100%,
while the image on the right has a light Intensity of 500%. In the image on the right, the
outer rings are slightly brighter, but the innermost ring is overexposed. If the Falloff Start
of the light in the image on the right were increased to 1000, the rings would be
overexposed.
Intensity set to 100; Falloff Start set to 0
Intensity set to 500; Falloff Start set to 0
Falloff:
A slider and value slider that control the rate of falloff for a point or spot light
based on the Falloff Start setting. At low values, light falls off over a long distance from
the light source; therefore, the light travels further in the image. At high values, the falloff
occurs more rapidly.
Spot Cone Angle:
A dial and value slider that become available only when Light Type is
set to Spot. The Spot Cone Angle is measured from the center of the light outward. The
angle may be set to a value between 0 and 90 degrees. The distance of the light from its
target affects the result of this parameter. If the light is close, a wider spot cone angle
may be needed to light more of the object. If the light is further away, a lower Spot Cone
Angle may be needed to isolate objects.
Cone Softness:
A dial and value slider that become available only when Light Type is set
to Spot. Like Spot Cone Angle, this parameter can be set to a value between 0 and
90 degrees. Its starting point begins at the outer edge of the Spot Cone Angle. If set to
0, spot lights have a hard edge. Low values produce a slight softening effect to the
boundary of the lit area. Higher values produce a wide, more natural fade. Adding softness
expands the area of your light, so you may need to adjust the angle to achieve the desired
effect.
Note: Point lights and Spot lights also contain a set of parameters to control how they
cast shadows. For more information on these parameters, see
.
HUD Controls
The Light HUD contains the Light Type, Color, Intensity, Falloff Start, and Falloff parameters,
which are also available in the Inspector. The Light HUD also contains 3D transform
controls. For more information, see
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Chapter 18
3D Compositing