light

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.