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.