override public function project(renderSessionData:RenderSessionData):void
                  {
                          // Transform camera
                          renderSessionData.camera.transformView();
                          
                          //Start looping through all objects in the scene.
                          var objects:Array = renderSessionData.renderObjects;
                          var p:DisplayObject3D;
                          var i:Number = objects.length;
                          var test:Number;
                          
                          //The frustum camera requires 4x4 matrices.
                          if( renderSessionData.camera.useProjectionMatrix ){
                                  for each(p in objects){
                                          //Test if the object is set to visible
                                          if(p.visible){
                                                  //If we filter objects per viewport..then....
                                                  if(renderSessionData.viewPort.viewportObjectFilter){
                                                          //...test if the object should be rendered to this viewport.
                                                          test = renderSessionData.viewPort.viewportObjectFilter.testObject(p)
                                                          if(test){
                                                                  // project it.
                                                                  projectObject(p, renderSessionData, test);
                                                          }else{
                                                                  //...if the object shouldn't be rendered on this viewport
                                                                  renderSessionData.renderStatistics.filteredObjects++;
                                                          }
                                                  }else{
                                                          //If we don't filter objects.
                                                          projectObject(p, renderSessionData, 1);
                                                  }
                                          }
                                  }
                          }else{
                                  for each(p in objects){
                                          //Test if the object is set to visible
                                          
                                          if( p.visible){
                                                  //If we filter objects per viewport..then....
                                                  if(renderSessionData.viewPort.viewportObjectFilter){
                                                          test = renderSessionData.viewPort.viewportObjectFilter.testObject(p); 
                                                          if(test){
                                                                  // project it.
                                                                  projectObject(p, renderSessionData, test);
                                                          }else{
                                                                  //The object is filtered.
                                                                  renderSessionData.renderStatistics.filteredObjects++;
                                                          }
                                                  }else{
                                                          // project it
                                                          projectObject(p, renderSessionData, 1);
                                                  }
                                          }
                                  }
                          }
                  }
                  
                  protected function projectObject(object:DisplayObject3D, renderSessionData:RenderSessionData, test:Number):void
                  {
                          //Collect everything from the object
                          object.cullTest = test;
                          object.project(renderSessionData.camera, renderSessionData);
                          
                  }
                  
          }
  }