Sim/graphics/animation/lights/airplane taxi light flash
RGB form a 3-part normalized direction vector - see PluginsAndObjects.
A is unused and should be set to 0.0.
Alpha is set to 1 if the taxi light is on or 0.0 if it is off. RGB is set to white. Size is set to the view angle.
This light will turn off if the taxi light is off.
This provides a taxi light. It grows bigger with direction and follows the brightness of the generic lights.