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A rectangle with the given angular width and height
dimensions. name is a string used for
identification purposes. optargs is a lua
table containing
optional parameters.
The position of the source is given by these parameters:
theta
The distance from the optical axis to the center of the rectangle, in radians. If not specified, it defaults to ‘0’.
phi
The azimuth about the optical axis, in radians. If not specified, it defaults to ‘0’.
z
The Z coordinate of the source. This defaults to an infinitely distant source.
For instructions on specifying the source distribution, Intensity Distributions.