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 setting their positions places them along a ray from the origin through the given point.

• num: Return the number of lights available.
• light_number on: Turn a light on.
• light_number off: Turn a light off.
• 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.
• light _numer pos: Return current position.
• light _numer pos default: Return default position.
• light _numer pos { x y z}: Set light position.