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6.1.3 disk( name, radius [, optargs] )

A circular disk with the given angular radius. 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.