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Directional light adds the angular diameter to the common 3Delight attributes.
Angular Diameter
A directional light emulates a point light source that is placed at infinity. It is handy to be able to specify objects that are extremely far but are not well simulated by a single point (e.g. the Sun). It would be impractical to specify the footprint of a far away object using absolute values of distance and size so we use instead the angular diameter, in degrees, spanned by an object in the sky.
The following examples have an angular diameter of 0.0, 0.5 (e.g. the sun), 2.0 and 4.0 degrees.
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