[page:Object3D] →
		[name]
		Visualize a [page:DirectionalLight]'s effect on the scene
		Constructor
		[name]([page:DirectionalLight light], [page:Number size])
		
		light -- [page:DirectionalLight] -- Light to visualize 
		size -- dimensions of the plane
		
		
		Creates a line and plane to visualize the light's position and direction
		
		Properties
		[property:Line lightPlane]
		
		Contains the line mesh showing the location of the directional light.
		
		[property:DirectionalLight light]
		
		Contains the directionalLight.
		
		[property:Line targetLine]
		
		Contains the line mesh that shows the direction of the light.
		
		Methods
		.[method:null update]()
		
		Updates the helper to match the position and direction of the [page:.light].
		
		Source
		[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]