1 /**
  2  * @author mikael emtinger / http://gomo.se/
  3  * @author alteredq / http://alteredqualia.com/
  4  */
  5 
  6 /**@constructor*/
  7 THREE.Bone = function( belongsToSkin ) {
  8 
  9 	THREE.Object3D.call( this );
 10 
 11 	this.skin = belongsToSkin;
 12 	this.skinMatrix = new THREE.Matrix4();
 13 
 14 };
 15 
 16 THREE.Bone.prototype = Object.create( THREE.Object3D.prototype );
 17 
 18 THREE.Bone.prototype.update = function( parentSkinMatrix, forceUpdate ) {
 19 
 20 	// update local
 21 
 22 	if ( this.matrixAutoUpdate ) {
 23 
 24 		forceUpdate |= this.updateMatrix();
 25 
 26 	}
 27 
 28 	// update skin matrix
 29 
 30 	if ( forceUpdate || this.matrixWorldNeedsUpdate ) {
 31 
 32 		if( parentSkinMatrix ) {
 33 
 34 			this.skinMatrix.multiply( parentSkinMatrix, this.matrix );
 35 
 36 		} else {
 37 
 38 			this.skinMatrix.copy( this.matrix );
 39 
 40 		}
 41 
 42 		this.matrixWorldNeedsUpdate = false;
 43 		forceUpdate = true;
 44 
 45 	}
 46 
 47 	// update children
 48 
 49 	var child, i, l = this.children.length;
 50 
 51 	for ( i = 0; i < l; i ++ ) {
 52 
 53 		this.children[ i ].update( this.skinMatrix, forceUpdate );
 54 
 55 	}
 56 
 57 };
 58 
 59 

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