An effect which creates a monochrome duplicate of an input with
blurry edges.
This effect is primarily used along with its default black color for
purposes of combining it with the original to create a shadow.
It can also be used with a light color and combined with an original
to create a glow effect.
The DropShadow effect is a utility effect which automatically
combines this Shadow effect with an original graphic for ease
of adding a shadow to an existing scene graph Node with a
single effect.
extends