var builder = new function(){
	var base = this
	base.tube = new Tube ()
	
	var els = []
	
	base.tube.on("clipper:update", rebuild)
	
	function rebuild(){
		clear()
		build()
	}
	function build (){
		clipper.regions.forEach(function(r){
			var walls = r.walls()
			walls.forEach(function(el){
				els.push(el)
				scene.add(el)
			})
		})
	}
	function clear (){
		els.forEach(function(el){
			scene.remove(el)
		})
		els = []
	}

}