Godot Camera2D on rail

extends Path2D

export (NodePath) var target_node
onready var target = get_node(target_node)

export (float) var lerp_speed: = 2.0

onready var follower: = $PathFollow2D

func _process(delta:float)->void:
    var offset: = curve.get_closest_offset(target.global_position - global_position)
    follower.offset = lerp(follower.offset, offset, lerp_speed*delta)