1 /**
  2  * @author WestLangley / http://github.com/WestLangley
  3  * @author zz85 / https://github.com/zz85
  4  *
  5  * Creates an arrow for visualizing directions
  6  *
  7  * Parameters:
  8  *  dir - Vector3
  9  *  origin - Vector3
 10  *  length - Number
 11  *  hex - color in hex value
 12  */
 13 
 14 /**@constructor*/
 15 THREE.ArrowHelper = function ( dir, origin, length, hex ) {
 16 
 17 	THREE.Object3D.call( this );
 18 
 19 	if ( hex === undefined ) hex = 0xffff00;
 20 	if ( length === undefined ) length = 20;
 21 
 22 	var lineGeometry = new THREE.Geometry();
 23 	lineGeometry.vertices.push( new THREE.Vector3( 0, 0, 0 ) );
 24 	lineGeometry.vertices.push( new THREE.Vector3( 0, 1, 0 ) );
 25 
 26 	this.line = new THREE.Line( lineGeometry, new THREE.LineBasicMaterial( { color: hex } ) );
 27 	this.add( this.line );
 28 
 29 	var coneGeometry = new THREE.CylinderGeometry( 0, 0.05, 0.25, 5, 1 );
 30 
 31 	this.cone = new THREE.Mesh( coneGeometry, new THREE.MeshBasicMaterial( { color: hex } ) );
 32 	this.cone.position.set( 0, 1, 0 );
 33 	this.add( this.cone );
 34 
 35 	if ( origin instanceof THREE.Vector3 ) this.position = origin;
 36 
 37 	this.setDirection( dir );
 38 	this.setLength( length );
 39 
 40 };
 41 
 42 THREE.ArrowHelper.prototype = Object.create( THREE.Object3D.prototype );
 43 
 44 THREE.ArrowHelper.prototype.setDirection = function ( dir ) {
 45 
 46 	var axis = new THREE.Vector3( 0, 1, 0 ).crossSelf( dir );
 47 
 48 	var radians = Math.acos( new THREE.Vector3( 0, 1, 0 ).dot( dir.clone().normalize() ) );
 49 
 50 	this.matrix = new THREE.Matrix4().makeRotationAxis( axis.normalize(), radians );
 51 
 52 	this.rotation.setEulerFromRotationMatrix( this.matrix, this.eulerOrder );
 53 
 54 };
 55 
 56 THREE.ArrowHelper.prototype.setLength = function ( length ) {
 57 
 58 	this.scale.set( length, length, length );
 59 
 60 };
 61 
 62 THREE.ArrowHelper.prototype.setColor = function ( hex ) {
 63 
 64 	this.line.material.color.setHex( hex );
 65 	this.cone.material.color.setHex( hex );
 66 
 67 };
 68 

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