package  {
	import flash.display.Sprite; 
	import flash.events.Event;
	import org.papervision3d.core.proto.CameraObject3D;
	
	import org.papervision3d.view.Viewport3D; // We need a viewport
	import org.papervision3d.cameras.*; // Import all types of camera
	import org.papervision3d.scenes.Scene3D; // We'll need at least one scene
	import org.papervision3d.render.BasicRenderEngine; // And we need a renderer
	
	public class Ancestor extends Sprite { //Must be "extends Sprite"
		
		public var viewport:Viewport3D; // The Viewport
		public var renderer:BasicRenderEngine; // Rendering engine
		
		public var current_scene:Scene3D;
		public var current_camera:CameraObject3D;
		public var current_viewport:Viewport3D;
		public var default_scene:Scene3D;
		public var default_camera:Camera3D;
		
		public function init(vpWidth:Number = 800, vpHeight:Number = 600):void {
			initPapervision(vpWidth, vpHeight); // Initialise papervision
			init3d();
			initEvents(); // Set up any event listeners..
		}
		
		protected function initPapervision(vpWidth:Number, vpHeight:Number):void {
			if (vpWidth == 0) {
				viewport = new Viewport3D(stage.width, stage.height, true, true);
			}else{
				viewport = new Viewport3D(vpWidth, vpHeight, false, true);
			}
			addChild(viewport); 
			renderer = new BasicRenderEngine();
			default_scene = new Scene3D();
			default_camera = new Camera3D();
			
			current_camera = default_camera;
			current_scene = default_scene;
			current_viewport = viewport;
			
		}
		
		protected function init3d():void {
		}
		
		protected function initEvents():void {
			addEventListener(Event.ENTER_FRAME, onEnterFrame);
			
		}
		
		protected function processFrame():void {
			// Process any movement or animation here.
		}
		
		protected function onEnterFrame( ThisEvent:Event ):void {
			//We need to render the scene and update anything here.
			processFrame();
			renderer.renderScene(current_scene, current_camera, current_viewport);
		}
		
	}
	
}