diff --git a/src/corelib/kernel/qeventdispatcher_win.cpp b/src/corelib/kernel/qeventdispatcher_win.cpp
index 6eff2f8d262..fbc7d319112 100644
--- a/src/corelib/kernel/qeventdispatcher_win.cpp
+++ b/src/corelib/kernel/qeventdispatcher_win.cpp
@@ -634,7 +634,18 @@ bool QEventDispatcherWin32::processEvents(QEventLoop::ProcessEventsFlags flags)
                     return false;
                 }
 
-                if (!filterNativeEvent(QByteArrayLiteral("windows_generic_MSG"), &msg, 0)) {
+                // 3ds Max extension: Emit a signal that allows 3ds Max to do it's specific message preprocessing
+                // before Qt translates and dispatches the message. If 3ds Max already processed the message, 
+                // there is no need to propagate / dispatch it further by Qt.
+                // Note, that 3ds Max cannot use the native event filter mechanism below for doing it's message 
+                // preprocessing, since filterNativeEvent() with the event type "windows_generic_MSG" is also used 
+                // by the QWindowsContext::windowsProc().
+                // Getting called twice from two different locations without be able to do a proper distinction of
+                // the calling source on the 3ds Max side, can lead to endless loops causing stack overflows.
+                bool eventProcessed = false;
+                emit preProcessNativeEvent( &msg, &eventProcessed );
+
+                if ( !eventProcessed && !filterNativeEvent(QByteArrayLiteral("windows_generic_MSG"), &msg, 0)) {
                     TranslateMessage(&msg);
                     DispatchMessage(&msg);
                 }
@@ -670,6 +681,9 @@ bool QEventDispatcherWin32::processEvents(QEventLoop::ProcessEventsFlags flags)
     if (needWM_QT_SENDPOSTEDEVENTS)
         PostMessage(d->internalHwnd, WM_QT_SENDPOSTEDEVENTS, 0, 0);
 
+    // 3ds Max extension for triggering progressive rendering.
+    emit allEventsProcessed();
+
     return retVal;
 }
 
diff --git a/src/corelib/kernel/qeventdispatcher_win_p.h b/src/corelib/kernel/qeventdispatcher_win_p.h
index 3bb618153b3..7a927d5826d 100644
--- a/src/corelib/kernel/qeventdispatcher_win_p.h
+++ b/src/corelib/kernel/qeventdispatcher_win_p.h
@@ -108,6 +108,16 @@ class Q_CORE_EXPORT QEventDispatcherWin32 : public QAbstractEventDispatcher
 
     HWND internalHwnd();
 
+Q_SIGNALS:
+
+    // 3ds Max extension for win32 message preprocessing.
+    // Emitted before the native event filter are called and the win32 message gets translated/dispatched. 
+    void preProcessNativeEvent( void* message, bool* returnProcessed );
+
+    // 3ds Max extension for progressive rendering.
+    // Emitted after all win32 messages has been dispatched.
+    void allEventsProcessed();
+
 protected:
     QEventDispatcherWin32(QEventDispatcherWin32Private &dd, QObject *parent = 0);
     virtual void sendPostedEvents();