Object3D.js

/**
 * @author mr.doob / http://mrdoob.com/
 * @author mikael emtinger / http://gomo.se/
 * @author alteredq / http://alteredqualia.com/
 */

THREE.Object3D = function() {

	this.parent = undefined;
	this.children = [];

	this.up = new THREE.Vector3( 0, 1, 0 );

	this.position = new THREE.Vector3();
	this.rotation = new THREE.Vector3();
	this.scale = new THREE.Vector3( 1, 1, 1 );

	this.rotationAutoUpdate = true;

	this.matrix = new THREE.Matrix4();
	this.matrixWorld = new THREE.Matrix4();
	this.matrixRotationWorld = new THREE.Matrix4();

	this.matrixAutoUpdate = true;
	this.matrixWorldNeedsUpdate = true;

	this.quaternion = new THREE.Quaternion();
	this.useQuaternion = false;

	this.boundRadius = 0.0;
	this.boundRadiusScale = 1.0;

	this.visible = true;

	this._vector = new THREE.Vector3();
	
	this.name = "";

};


THREE.Object3D.prototype = {

	translate : function ( distance, axis ) {

		this.matrix.rotateAxis( axis );
		this.position.addSelf( axis.multiplyScalar( distance ) );

	},

	translateX : function ( distance ) {

		this.translate( distance, this._vector.set( 1, 0, 0 ) );

	},

	translateY : function ( distance ) {

		this.translate( distance, this._vector.set( 0, 1, 0 ) );

	},

	translateZ : function ( distance ) {

		this.translate( distance, this._vector.set( 0, 0, 1 ) );

	},

	lookAt : function ( vector ) {

		// TODO: Add hierarchy support.

		this.matrix.lookAt( vector, this.position, this.up );

		if ( this.rotationAutoUpdate ) {

			this.rotation.setRotationFromMatrix( this.matrix );

		}

	},

	addChild: function ( child ) {

		if ( this.children.indexOf( child ) === - 1 ) {

			if( child.parent !== undefined ) {

				child.parent.removeChild( child );

			}

			child.parent = this;
			this.children.push( child );

			// add to scene

			var scene = this;

			while ( scene.parent !== undefined ) {

				scene = scene.parent;

			}

			if ( scene !== undefined && scene instanceof THREE.Scene )  {

				scene.addChildRecurse( child );

			}

		}

	},

	removeChild: function ( child ) {

		var childIndex = this.children.indexOf( child );

		if ( childIndex !== - 1 ) {

			child.parent = undefined;
			this.children.splice( childIndex, 1 );

		}

	},
	
	getChildByName: function ( name, doRecurse ) {
		
		var c, cl, child, recurseResult;
		
		for( c = 0, cl = this.children.length; c < cl; c++ ) {
			
			child = this.children[ c ];
			
			if( child.name === name ) {
				
				return child;
				
			}
			
			if( doRecurse ) {
				
				recurseResult = child.getChildByName( name, doRecurse );
				
				if( recurseResult !== undefined ) {
					
					return recurseResult;
					
				}
				
			}
			
		}
		
		return undefined;
		
	},

	updateMatrix: function () {

		this.matrix.setPosition( this.position );

		if ( this.useQuaternion )  {

			this.matrix.setRotationFromQuaternion( this.quaternion );

		} else {

			this.matrix.setRotationFromEuler( this.rotation );

		}

		if ( this.scale.x !== 1 || this.scale.y !== 1 || this.scale.z !== 1 ) {

			this.matrix.scale( this.scale );
			this.boundRadiusScale = Math.max( this.scale.x, Math.max( this.scale.y, this.scale.z ) );

		}

		this.matrixWorldNeedsUpdate = true;

	},

	update: function ( parentMatrixWorld, forceUpdate, camera ) {

		this.matrixAutoUpdate && this.updateMatrix();

		// update matrixWorld

		if ( this.matrixWorldNeedsUpdate || forceUpdate ) {

			if ( parentMatrixWorld ) {

				this.matrixWorld.multiply( parentMatrixWorld, this.matrix );

			} else {

				this.matrixWorld.copy( this.matrix );

			}

			this.matrixRotationWorld.extractRotation( this.matrixWorld, this.scale );

			this.matrixWorldNeedsUpdate = false;

			forceUpdate = true;

		}

		// update children

		for ( var i = 0, l = this.children.length; i < l; i ++ ) {

			this.children[ i ].update( this.matrixWorld, forceUpdate, camera );

		}

	}

};