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			var matrix:Matrix3D = Matrix3D.IDENTITY;
			for( var i:int = 0; i < node.transforms.length; i++ ) 
			{
				var transform:DaeTransform = node.transforms[i];
				
				matrix = Matrix3D.multiply( matrix, new Matrix3D(transform.matrix) );
			}	
			return matrix;
		}
		
		/**
		 * 
		 * @param	node
		 * @return
		 */
		private function buildMatrixStack( node:DaeNode ):Array
		{
			var stack:Array = new Array();
			for( var i:int = 0; i < node.transforms.length; i++ ) 
			{
				var transform:DaeTransform = node.transforms[i];				
				var matrix:Matrix3D = new Matrix3D(transform.matrix);
				stack.push(matrix);
			}
			return stack;
		}
		
		/**
		 * 
		 * @param	instance_controller
		 * @param	instance
		 * @return
		 */
		private function buildMorph( instance_controller:DaeInstanceController, instance:AnimatedMesh3D ):void
		{
			var controller:DaeController = document.controllers[instance_controller.url];
			var morph:DaeMorph = controller.morph;
		
			var success:Boolean = buildGeometry(morph.source, instance);
			
			if( !success )
			{
				Logger.error("[ERROR] could not find geometry for morph!");
				throw new Error("could not find geometry for morph!");
			}

			var ctl:MorphController = new MorphController(instance.geometry);
			
			var target0:DisplayObject3D = new DisplayObject3D();
			buildGeometry(morph.source, target0);
			
			var frame:uint = 0;
			var duration:uint = AnimationEngine.NUM_FRAMES / morph.targets.length;
			
			// use a copy of the original vertices!
			ctl.addFrame(new AnimationFrame(frame, duration, target0.geometry.vertices, "start"));
			
			frame += duration;
			
			for( var i:int = 0; i < morph.targets.length; i++ )
			{
				var obj:DisplayObject3D = new DisplayObject3D();
							
				var target:String = morph.targets[i];
				var weight:Number = morph.weights[i];
				
				buildGeometry(target, obj);
				
				ctl.addFrame(new AnimationFrame(frame, duration, obj.geometry.vertices, target));
				frame += duration;
			}
			
			instance.addController(ctl);
			
			_morphs[ instance ] = true;
		}
		
		/**
		 * 
		 * @param	node
		 * @return
		 */
		private function buildNode( node:DaeNode, parent:DisplayObject3D ):void
		{				
			var instance_controller :DaeInstanceController = findSkinController(node);
			var instance_ctl_morph :DaeInstanceController = findMorphController(node);
			
			var newNode:DisplayObject3D;
			var instance:DisplayObject3D;
			var material:MaterialObject3D;
						
			if( instance_controller )
			{
				buildMaterialInstances(instance_controller.materials);
				newNode = buildSkin(instance_controller, material);
				
				if( newNode )
				{
					flipFaceNormals(newNode.geometry);
					
					instance = parent.addChild(newNode);
				}
			}
			else if( instance_ctl_morph ) 
			{
				buildMaterialInstances(instance_ctl_morph.materials);
				
				newNode = new AnimatedMesh3D(material, new Array(), new Array(), node.id);
					
				buildMorph(instance_ctl_morph, newNode as AnimatedMesh3D);
	
				flipFaceNormals(newNode.geometry);
				
				instance = parent.addChild(newNode);
			}
			else if( node.geometries.length )
			{
				newNode = new Node3D(node.name, node.id, node.sid);

				for each( var geomInst:DaeInstanceGeometry in node.geometries )
				{
					material = buildMaterialInstances(geomInst.materials);
					buildGeometry(geomInst.url, newNode, material);
				}
				
				if(newNode.geometry && newNode.geometry.vertices && newNode.geometry.faces)
				{
					newNode.geometry.ready = true;
					flipFaceNormals(newNode.geometry);
				}
				
				instance = parent.addChild(newNode);
				Node3D(instance).matrixStack = buildMatrixStack(node);
				Node3D(instance).transforms = node.transforms;
			}
			else
			{
				instance = parent.addChild(new Node3D(node.name, node.id, node.sid));
				Node3D(instance).matrixStack = buildMatrixStack(node);
				Node3D(instance).transforms = node.transforms;
			}
			
			for( var j:int = 0; j < node.instance_nodes.length; j++ )
			{
				var instance_node:DaeInstanceNode = node.instance_nodes[j];
				var dae_node:DaeNode = document.getDaeNodeById(instance_node.url);
				buildNode(dae_node, instance);
			}
			
			for( var i:int = 0; i < node.nodes.length; i++ )
				buildNode(node.nodes[i], instance);
				
			var matrix:Matrix3D = buildMatrix(node);
						
			instance.copyTransform( matrix );
		}
		
		/**
		 * 
		 * @param	event
		 * @return
		 */
		private function buildScene( event:Event ):void
		{
			if( _reader.hasEventListener(Event.COMPLETE) )
				_reader.removeEventListener(Event.COMPLETE, buildScene);
				
			this.document = _reader.document;
			
			_yUp = (this.document.asset.yUp == ASCollada.DAE_Y_UP);
			_materialInstances = new Object();
			_materialTextureSets = new Object();
			_skins = new Dictionary();
			_morphs = new Dictionary();
			
			this.skins = new Array();
			
			buildMaterials();
			
			buildVisualScene();
			
			linkSkins(this._rootNode);
			
			//if( !_loadScaleSet )
			//	this.scale = DEFAULT_SCALE;
			
			// there may be animations left to parse...
			if( document.numQueuedAnimations )
			{
				hasAnimations = true;
				_reader.addEventListener( Event.COMPLETE, animationCompleteHandler );
				_reader.addEventListener( ProgressEvent.PROGRESS, animationProgressHandler );
				
				_reader.readAnimations();
			}
			else
			{
				hasAnimations = false;
			
				// done with geometry
				dispatchEvent(new Event(Event.COMPLETE));
			}
		}
		
		/**
		 * 
		 * @param	instance_controller
		 * @return
		 */
		private function buildSkin( instance_controller:DaeInstanceController, material:MaterialObject3D = null ):TriangleMesh3D
		{
			var controller:DaeController = document.controllers[ instance_controller.url ];
			
			if( !controller || !controller.skin )
			{
				Logger.trace( "[WARNING] no skin controller!" );
				return null;
			}
			
			var skin:DaeSkin = controller.skin;
			
			var obj:Skin3D = new Skin3D(material, new Array(), new Array(), skin.source, (document.yUp == DaeDocument.Y_UP));
			
			obj.bindPose = new Matrix3D(skin.bind_shape_matrix);	

			obj.joints = new Array();
			
			var success:Boolean = buildGeometry(skin.source, obj);
				
			// geometry could reside in a morph controller
			if( !success && document.controllers[skin.source] )
			{
				var morph_controller:DaeController = document.controllers[skin.source];
				if( morph_controller.morph )
				{
					success = buildGeometry(morph_controller.morph.source, obj);
					
					if( success )
					{
						var ctl:MorphController = new MorphController(obj.geometry);
						
						var method:String = morph_controller.morph.method;
						var duration:int = AnimationEngine.NUM_FRAMES / morph_controller.morph.targets.length;
						var frame:uint = 0;
						
						for( var i:int = 0; i < morph_controller.morph.targets.length; i++ )
						{
							var morph:DisplayObject3D = new DisplayObject3D();
							
							var target:String = morph_controller.morph.targets[i];
							var weight:Number = morph_controller.morph.weights[i];
							
							var morph_succes:Boolean = buildGeometry(target, morph);
							
							if( morph_succes )
							{
								ctl.addFrame(new AnimationFrame(frame, duration, morph.geometry.vertices, target));
								frame += duration;
								//obj.morph_targets.push( morph.geometry );
								//obj.morph_weights.push( weight );
							}
						}
						
						obj.addController(ctl);
					}
				}
			}
			
			if( !success )
			{
				Logger.error( "[ERROR] could not find geometry for skin!" );
				throw new Error( "could not find geometry for skin!" );
			}
			
			obj.geometry.ready = true;
			
			_skins[ obj ] = instance_controller;
			
			this.skins.push(obj);
			
			return obj;
		}
				
		/**
		 * 
		 * @param	spline
		 * @return
		 */
		private function buildSpline( spline:DaeSpline ):DisplayObject3D
		{
			var lines:Lines3D = new Lines3D(new LineMaterial(0xffff00, 0.5));
					
			for( var i:int = 0; i < spline.vertices.length; i++ )
			{
				var v0:Array = spline.vertices[i];
				var v1:Array = spline.vertices[(i+1) % spline.vertices.length];
				lines.addNewLine(0, v0[0], v0[1], v0[2], v1[0], v1[1], v1[2]);
			}
			
			return lines;
		}
		
		/**
		 * 
		 * @param	mesh
		 * @return
		 */
		private function buildVertices( mesh:DaeMesh ):Array
		{
			var vertices:Array = new Array();
			
			for( var i:int = 0; i < mesh.vertices.length; i++ )
			{
				var v:Array = mesh.vertices[i];
				
				vertices.push(new Vertex3D(v[0], v[1], v[2]));
			}
			
			return vertices;
		}

		/**
		 * Builds the visual scene (scenegraph).
		 */
		private function buildVisualScene():void
		{
			this._rootNode = addChild(new DisplayObject3D("COLLADA_root"));
			
			for( var i:int = 0; i < document.vscene.nodes.length; i++ )
				buildNode(document.vscene.nodes[i], this._rootNode);
				
			if(this._yUp)
			{
				
			}
			else
			{
				this._rootNode.rotationX = 90;
				this._rootNode.rotationY = 180;
			}
			
			this._rootNode.scaleX = -1;
		}
		
		
		/**
		 * Clones the source and append the clone to target. Then recurse...
		 * 
		 * @param	target
		 * @param	source
		 */
		private function cloneObj( target:DisplayObject3D, source:DisplayObject3D ):void
		{
			var o:DisplayObject3D;
			
			if( source === _rootNode )
			{
				o = new DisplayObject3D(source.name);
				o.copyTransform( source.transform );
				target = target.addChild(o);
			}
			else if( source is Skin3D )
			{
				o = Skin3D(source).clone();	
				o.copyTransform( source.transform );
				o.geometry.ready = true;
				target = target.addChild(o);
			}
			else if( source is Node3D )
			{
				var n:Node3D = source as Node3D;
				
				o = n.clone();
				o.copyTransform(n.transform);
				o.geometry = cloneGeometry(o, source.geometry);
				o.geometry.ready = true;
				target = target.addChild(o);
			}
			else if( source is TriangleMesh3D )
			{
				o = new TriangleMesh3D(source.material, new Array(), new Array(), source.name);
				o.copyTransform( source.transform );
				o.geometry = cloneGeometry(o, source.geometry);
				o.geometry.ready = true;
				target = target.addChild(o);
			}
			else if( source is DisplayObject3D )
			{
				o = new DisplayObject3D(source.name);
				o.copyTransform(source.transform);
				target = target.addChild(o);
			}
			
			for each( var child:DisplayObject3D in source.children )
			{
				cloneObj(target, child);
			}
		}
		
		/**
		 * Clones a GeometryObject3D an sets up the faces for target.
		 * 
		 * @param	target	The target for the cloned faces and vertices.
		 * @param	source	The source GeometryObject3D.
		 * 
		 * @return	GeometryObject3D
		 */
		private function cloneGeometry( target:DisplayObject3D, source:GeometryObject3D ):GeometryObject3D
		{			
			var geom:GeometryObject3D = new GeometryObject3D();
			
			var vertices:Array = source.vertices;
			var faces:Array = source.faces;
			var i:int;
			var newVerts:Dictionary = new Dictionary();
			
			geom.vertices = new Array();
			geom.faces = new Array();
			
			for( i = 0; i < vertices.length; i++ )
			{
				var v:Vertex3D = vertices[i];
				newVerts[ v ] = v.clone();
				geom.vertices.push( newVerts[ v ] );
			}
			
			for( i = 0; i < faces.length; i++ )
			{
				var f:Triangle3D = faces[i];
				
				var v0:Vertex3D = newVerts[ f.v0 ];
				var v1:Vertex3D = newVerts[ f.v1 ];
				var v2:Vertex3D = newVerts[ f.v2 ];
				
				var uv0:NumberUV = f.uv[0].clone();
				var uv1:NumberUV = f.uv[1].clone();
				var uv2:NumberUV = f.uv[2].clone();
				
				var newTri:Triangle3D = new Triangle3D(target, [v0, v1, v2], f.material, [uv0, uv1, uv2]);
				
				geom.faces.push( newTri );
			}
			
			return geom;