fixed compilation failure on osx

src/MainWindow.cpp

@@ -352,7 +352,7 @@ void MainWindow::slotStartPlaying()
             dispatch_queue_t main_q = dispatch_get_main_queue();
             dispatch_async(main_q, ^(void){
                                //visualisationThread->moveToThread(QApplication::instance()->thread());
-                               visualisationThread->run();
+                               _visualisationThread->run();
                            });
 #else
             _visualisationThread->start();
@@ -1228,7 +1228,7 @@ void MainWindow::waitForVisioThread()
 #ifdef __linux__
         _visualisationThread->quit();
 #else
-        visualisationThread->terminate();
+        _visualisationThread->terminate();
 #endif
     }
     Debug::Messages("Visualisation Engine shutdown successfully");

src/ThreadVisualisation.cpp

@@ -140,7 +140,7 @@ void ThreadVisualisation::run()
 {
 
     //deactivate the output windows
-    //vtkObject::GlobalWarningDisplayOff();
+    vtkObject::GlobalWarningDisplayOff();
 
     //emit signalStatusMessage("running");
 
@@ -264,7 +264,7 @@ void ThreadVisualisation::run()
     //CAUTION: this is necessary for WIN32 to update the window name
     // but his will freeze your system on linux
 #if defined(_WIN32) || defined(__APPLE__)
-    renderWindow->Render();
+    _renderWindow->Render();
 #endif
 
     _renderWindow->SetWindowName(_winTitle.toStdString().c_str());