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There are four light sources, numbered 0 to 3, which are used to
illuminate graphical objects. They are point sources located at
infinity so the only controls are to rotate a light or turn it on or
off. A dotted line from the light to the axis can be turned on to help
show where the light is located.
- num: Return the number of lights available.
- light_number on: Turn a light on.
- light_number off: Turn a light off.
- light_number highlight: Display a line indicating the
position of a light source.
- light_number unhighlight: Hide the line indicating the
position of a light source.
- light_number status: Return the pair on/off highlight/unhighlight
- light_number rot < x | y | z > angle: Rotate a light (at infinity) angle degrees about a given axis.
Sergei Izrailev
Fri Jul 25 17:07:27 CDT 1997