Instruction Manual

Chapter 21 3D compositing 943
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 Fallo Start of the light in the
image on the right is increased to 1000, the rings are overexposed.
Intensity set to 100; Falloff Start set to 0 Intensity set to 500; Falloff Start set to 0
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Fallo: A slider that controls the rate of fallo for a point or spot light based on the Fallo Start
setting. At low values, light falls o over a long distance from the light source; therefore, the
light travels farther in the image. At high values, the fallo occurs more rapidly.
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Cone Angle: A dial that becomes available only when Light Type is set to Spot. The 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 aects 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 Cone Angle may be needed to isolate objects.
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Soft Edge: A dial that becomes available only when Light Type is set to Spot. Like 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 Cone Angle. If set to 0, spot lights have a hard edge. Low values produce
a slight softening eect 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 might need to adjust the
angle to achieve a specic eect.
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 Shadows overview on page 944.
The Light HUD contains the Light Type, Color, Intensity, Fallo Start, and Fallo parameters, which
are also available in the Inspector. The Light HUD also contains 3D transform controls. For more
information, see 3D transform HUD controls on page 913.
Object lighting parameters
All lightable objects have properties that control how they react to lights in a scene. You can
adjust these properties for an object via the Lighting section of the Properties Inspector.
Parameters in the Inspector
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Shading: A pop-up menu that enables you to set how an object responds to lights in the
scene. If set to On, the object can be lit. If set to O, the object ignores scene lights. If set to
Inherited (the default), the object uses the Shading value of its parent.
Note: It is possible to set the Shading parameter of a child of a group (however deep it is
nested) to On. That setting overrides any group settings previously applied to the child object.
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Highlights: A checkbox that controls whether lit objects show highlights. This parameter
has no eect if Shading is set to O. Click the disclosure triangle to reveal an additional
Shininess parameter.
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