| Penumbra Angle|
The penumbra angle
element determines the penumbra angle of the active light
cone, if the light in question is the spot light
. The penumbra is the outer spot light cone. The inner part encloses the light cone angle
. If the penumbra angle is smaller than the light cone angle, then a light cone without any penumbra is used. The penumbra angle is expressed in radians, the default setting being 0.
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