Spot lights allow you to achieve special lighting effects in your scene. Although they consume quite a bit of processing power, you may feel the end result is worth the cost in some cases.
The Light Editor provides fields for specifying the radius, cut-off angle, and beam width of a spotlight, as shown in this diagram:
A spot light produces a cone of light. Anything outside the cut-off angle is not illuminated by the spot light. You can think of the cone of light as an inner cone (specified by beam width) and an outer cone (the parts of the one between the inner cone and the cut-off angle). The inner cone of light is full intensity. The outer cone of light becomes gradually fainter as you move from the inner cone boundary to the cut-off angle. The term used to describe how light becomes fainter with distance from its source is attenuation.
For the best spot light effect, try a beam width of 10 degrees and a cut-off angle of 45 degrees instead of the default values.
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