[name]
		A geometric line segment represented by a start and end point.
		Constructor
		[name]([page:Vector3 start], [page:Vector3 end])
		
		start -- [page:Vector3] Start of the line segment
		end -- [page:Vector3] End of the line segment
		
		
		The start and end vectors default to origin vectors if none are set.
		
		Properties
		[property:Vector3 start]
		[property:Vector3 end]
		Methods
		[method:Line3 set]([page:Vector3 start], [page:Vector3 end])
		
		start -- [page:Vector3] 
		end -- [page:Vector3]
		
		
		Sets the start and end values by copying the provided vectors.
		
		[method:Line3 copy]([page:Line3 line])
		
		line -- [page:Line3]
		
		
		Copies the passed line's start and end vectors to this line.
		
		[method:Line3 clone]()
		
		Return a new copy of this [page:Line3].
		
		[method:Boolean equals]([page:Line3 line])
		
		line -- [page:Line3]
		
		
		[method:Float distance]()
		
		Returns the length of the line segment.
		
		Returns true if both line's start and end points are equal.
		
 
		
		[method:Float distanceSq]()
		
		Returns the line segment's length squared.
		
		[method:Line3 applyMatrix4]([page:Matrix4 matrix]) [page:Line3 this]
		
		matrix -- [page:Matrix4]
		
		
		Apply a matrix transform to the line segment.
		
		[method:Vector at]([page:Float t], [page:Vector3 optionalTarget])
		
		t -- [page:Float] Use values 0-1 to return a result on the line segment. 
		optionalTarget -- [page:Vector] Optional target to set the result.
		
		
		Return a vector at a certain position along the line. When t = 0, it returns the start vector, and when t=1 it returns the end vector.
		
		
		[method:Vector3 center]([page:Vector3 optionalTarget])
		
		optionalTarget -- [page:Vector3] Optional target to set the result.
		
		
		Return the center of the line segment.
		
		[method:Vector3 delta]([page:Vector3 optionalTarget])
		
		optionalTarget -- [page:Vector3] Optional target to set the result.
		
		
		Returns the delta vector of the line segment, or the end vector minus the start vector.
		
		[method:Vector3 closestPointToPoint]([page:Vector3 point], [page:Boolean clampToLine], [page:Vector3 optionalTarget])
		
		point -- [page:Vector3] 
		clampToLine -- [page:Boolean] 
		optionalTarget -- [page:Vector3] Optional target to set the result.
		
		
		Returns the closets point on the line. If clamp to line is true, then the returned value will be clamped to the line segment.
		
		[method:Float closestPointToPointParameter]([page:Vector3 point], [page:Boolean clampToLine])
		
		point -- [page:Vector3] 
		clampToLine -- [page:Boolean]
		
		
		Returns a point parameter based on the closest point as projected on the line segement. If clamp to line is true, then the returned value will be between 0 and 1.
		
		Source
		[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]