Sim/graphics/animation/lights/airplane generic light flash
RGB form a 3-part normalized direction vector - see PluginsAndObjects.
A is the index of the generic light number.
Alpha is set to the generic light brightness. RGB is set to white. Size is set to the view angle.
This light will turn off if the generic light is off.
This provides a generic light. It grows bigger with direction and follows the brightness of the generic lights.