var _scene:IScene = new Scene();
var _camera:ICamera = new Camera();
var _renderer:IRenderer = new MolehillRenderer();
var _viewport:Viewport = new Viewport();
_scene.addChild(_camera);
var m_context:Context = new Context();
m_context.renderer = _renderer;
m_context.camera = _camera;
m_context.scene = _scene;
m_context.viewport = _viewport;
_viewport.setViewport( x,y, _viewportWidth, _viewportHeight );
Yogurt3D.instance.contextManager.addContext( m_defaultContext );
Hope this helps