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A point source. name is a string used for identification
purposes. optargs is a lua
table containing optional
parameters. The following optional arguments are recognized:
theta
The distance from the optical axis to the point, 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. It defaults to an infinitely distant source.