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6.1.5 point( name [, optargs] )

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.