[page:Object3D] →

# [name]

An 3D arrow object for visualizing directions.

## Example

[example:webgl_geometries WebGL / geometries]
[example:webgl_geometry_normals WebGL / geometry / normals]
[example:webgl_shadowmesh WebGL / shadowmesh]
`var dir = new THREE.Vector3( 1, 2, 0 ); //normalize the direction vector (convert to vector of length 1) dir.normalize(); 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]([param:Vector3 dir], [param:Vector3 origin], [param:Number length], [param:Number hex], [param:Number headLength], [param:Number headWidth] )

[page:Vector3 dir] -- direction from origin. Must be a unit vector.
[page:Vector3 origin] -- Point at which the arrow starts.
[page:Number length] -- length of the arrow. Default is *1*.
[page:Number hex] -- hexadecimal value to define color. Default is 0xffff00.
[page:Number headLength] -- The length of the head of the arrow. Default is 0.2 * length.
[page:Number headWidth] -- The length of the width of the arrow. Default is 0.2 * headLength.

## Properties

See the base [page:Object3D] class for common properties.

### [property:Line line]

Contains the line part of the arrowHelper.

### [property:Mesh cone]

Contains the cone part of the arrowHelper.

## Methods

See the base [page:Object3D] class for common methods.

### [method:null setColor]([param:Color color])

color -- The desired color.
Sets the color of the arrowHelper.

### [method:null setLength]([param:Number length], [param:Number headLength], [param: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]([param: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]