[page:Object3D] →

# [name]

An 3D arrow Object.

## Example

`var dir = new THREE.Vector3( 1, 0, 0 ); var origin = new THREE.Vector3( 0, 0, 0 ); var length = 1; var hex = 0xffff00; var arrowHelper = new THREE.ArrowHelper( dir, origin, length, hex ); scene.add( arrowHelper );`

## Constructor

### [name]([page:Vector3 dir], [page:Vector3 origin], [page:Number length], [page:Number hex], [page:Number headLength], [page:Number headWidth] )

dir -- Vector3 -- direction from origin. Must be a unit vector.
origin -- Vector3
length -- scalar
hex -- hexadecimal value to define color ex:0xffff00
headLength -- The length of the head of the arrow
headWidth -- The length of the width of the arrow
This creates an arrow starting in origin in the direction dir for a certain length. It is also possible to change color.

## Properties

### [property:Line line]

Contains the line part of the arrowHelper.

### [property:Mesh cone]

Contains the cone part of the arrowHelper.

## Methods

### [method:null setColor]([page:Number hex])

hex -- The hexadicmal value of the color
Sets the color of the arrowHelper.

### [method:null setLength]([page:Number length], [page:Number headLength], [page:Number headWidth])

length -- The desired length
headLength -- The length of the head of the arrow
headWidth -- The length of the width of the arrow
Sets the length of the arrowhelper.

### [method:null setDirection]([page:Vector3 dir])

dir -- The desired direction. Must be a unit vector.
Sets the direction of the arrowhelper.

## Source

[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]