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In the example below, a light is positioned slightly above the origin of the scene. There
are three rings of cards at a distance of 200, 500, and 1000 units from the light. (In this
example, a visible light source—the bulb at the center of the rings of cards—is simulated
for illustrative purposes.) The lights Intensity is set to 100% and Falloff is set to 10%. When
Falloff Start is set to 0 (left, below), the light begins to fall off by the time it hits the
innermost ring. When Falloff Start is set to 200 (right, below), the inner ring is lit at 100%
intensity and the outer rings are slightly brighter than before.
Falloff Start set to 0 Falloff Start set to 200
When Falloff Start is increased to 500 (left, below), the inner and middle rings are lit at
100% intensity, and the outer ring is brighter than before. Finally, when Falloff Start is set
to 1000 (right, below), all rings are lit at 100% intensity.
Falloff Start set to 500 Falloff Start set to 1000
1271Chapter 21 3D Compositing