1 /**
  2  * @author alteredq / http://alteredqualia.com/
  3  *
  4  *	- shows hemisphere light intensity, sky and ground colors and directions
  5  */
  6 
  7 /**@constructor*/
  8 THREE.HemisphereLightHelper = function ( light, sphereSize, arrowLength, domeSize ) {
  9 
 10 	THREE.Object3D.call( this );
 11 
 12 	this.light = light;
 13 
 14 	// position
 15 
 16 	this.position = light.position;
 17 
 18 	//
 19 
 20 	var intensity = THREE.Math.clamp( light.intensity, 0, 1 );
 21 
 22 	// sky color
 23 
 24 	this.color = light.color.clone();
 25 
 26 	this.color.r *= intensity;
 27 	this.color.g *= intensity;
 28 	this.color.b *= intensity;
 29 
 30 	var hexColor = this.color.getHex();
 31 
 32 	// ground color
 33 
 34 	this.groundColor = light.groundColor.clone();
 35 
 36 	this.groundColor.r *= intensity;
 37 	this.groundColor.g *= intensity;
 38 	this.groundColor.b *= intensity;
 39 
 40 	var hexColorGround = this.groundColor.getHex();
 41 
 42 	// double colored light bulb
 43 
 44 	var bulbGeometry = new THREE.SphereGeometry( sphereSize, 16, 8, 0, Math.PI * 2, 0, Math.PI * 0.5 );
 45 	var bulbGroundGeometry = new THREE.SphereGeometry( sphereSize, 16, 8, 0, Math.PI * 2, Math.PI * 0.5, Math.PI );
 46 
 47 	var bulbSkyMaterial = new THREE.MeshBasicMaterial( { color: hexColor, fog: false } );
 48 	var bulbGroundMaterial = new THREE.MeshBasicMaterial( { color: hexColorGround, fog: false } );
 49 
 50 	for ( var i = 0, il = bulbGeometry.faces.length; i < il; i ++ ) {
 51 
 52 		bulbGeometry.faces[ i ].materialIndex = 0;
 53 
 54 	}
 55 
 56 	for ( var i = 0, il = bulbGroundGeometry.faces.length; i < il; i ++ ) {
 57 
 58 		bulbGroundGeometry.faces[ i ].materialIndex = 1;
 59 
 60 	}
 61 
 62 	THREE.GeometryUtils.merge( bulbGeometry, bulbGroundGeometry );
 63 
 64 	this.lightSphere = new THREE.Mesh( bulbGeometry, new THREE.MeshFaceMaterial( [ bulbSkyMaterial, bulbGroundMaterial ] ) );
 65 
 66 	// arrows for sky and ground light directions
 67 
 68 	this.lightArrow = new THREE.ArrowHelper( new THREE.Vector3( 0, 1, 0 ), new THREE.Vector3( 0, ( sphereSize + arrowLength ) * 1.1, 0 ), arrowLength, hexColor );
 69 	this.lightArrow.rotation.x = Math.PI;
 70 
 71 	this.lightArrowGround = new THREE.ArrowHelper( new THREE.Vector3( 0, 1, 0 ), new THREE.Vector3( 0, ( sphereSize + arrowLength ) * -1.1, 0 ), arrowLength, hexColorGround );
 72 
 73 	var joint = new THREE.Object3D();
 74 	joint.rotation.x = -Math.PI * 0.5;
 75 
 76 	joint.add( this.lightSphere );
 77 	joint.add( this.lightArrow );
 78 	joint.add( this.lightArrowGround );
 79 
 80 	this.add( joint );
 81 
 82 	//
 83 
 84 	this.lightSphere.properties.isGizmo = true;
 85 	this.lightSphere.properties.gizmoSubject = light;
 86 	this.lightSphere.properties.gizmoRoot = this;
 87 
 88 	//
 89 
 90 	this.properties.isGizmo = true;
 91 
 92 	//
 93 
 94 	this.target = new THREE.Vector3();
 95 	this.lookAt( this.target );
 96 
 97 }
 98 
 99 THREE.HemisphereLightHelper.prototype = Object.create( THREE.Object3D.prototype );
100 
101 THREE.HemisphereLightHelper.prototype.update = function () {
102 
103 	// update sphere sky and ground colors to light color * light intensity
104 
105 	var intensity = THREE.Math.clamp( this.light.intensity, 0, 1 );
106 
107 	this.color.copy( this.light.color );
108 	this.groundColor.copy( this.light.groundColor );
109 
110 	this.color.r *= intensity;
111 	this.color.g *= intensity;
112 	this.color.b *= intensity;
113 
114 	this.groundColor.r *= intensity;
115 	this.groundColor.g *= intensity;
116 	this.groundColor.b *= intensity;
117 
118 	this.lightSphere.material.materials[ 0 ].color.copy( this.color );
119 	this.lightSphere.material.materials[ 1 ].color.copy( this.groundColor );
120 
121 	this.lightArrow.setColor( this.color.getHex() );
122 	this.lightArrowGround.setColor( this.groundColor.getHex() );
123 
124 	this.lookAt( this.target );
125 
126 }
127 
128 

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