diff --git a/code/nel/tools/3d/object_viewer_qt/src/graphics_viewport.cpp b/code/nel/tools/3d/object_viewer_qt/src/graphics_viewport.cpp
index 2ea99c576..dc8a81dc8 100644
--- a/code/nel/tools/3d/object_viewer_qt/src/graphics_viewport.cpp
+++ b/code/nel/tools/3d/object_viewer_qt/src/graphics_viewport.cpp
@@ -116,6 +116,39 @@ void CGraphicsViewport::resizeEvent(QResizeEvent *resizeEvent)
 		Modules::objView().setSizeViewport(resizeEvent->size().width(), resizeEvent->size().height());
 }
 
+#if defined(NL_OS_WINDOWS) || defined(NL_OS_MAC)
+// Qt does not provide wheel events through winEvent() and macEvent() (but it 
+// does through x11Event(), which is inconsistent...)  
+// Workaround is to handle wheel events like implemented below.
+//
+// TODO: this is not a clean solution, because all but wheel events are 
+// handled using winEvent(), x11Event(), macEvent(). But this seems to be a 
+// limitation of current (4.7.1) Qt versions. (see e.g. qapplication_mac.mm)
+void CGraphicsViewport::wheelEvent(QWheelEvent *event)
+{
+	// Get relative positions.
+	float fX = 1.0f - (float)event->pos().x() / this->width();
+	float fY = 1.0f - (float)event->pos().y() / this->height();
+
+	// Get the buttons currently pressed.
+	uint32 buttons = NLMISC::noButton;
+	if(event->buttons() & Qt::LeftButton)        buttons |= NLMISC::leftButton;
+	if(event->buttons() & Qt::RightButton)       buttons |= NLMISC::rightButton;
+	if(event->buttons() & Qt::MidButton)         buttons |= NLMISC::middleButton;
+	if(event->modifiers() & Qt::ControlModifier) buttons |= NLMISC::ctrlButton;
+	if(event->modifiers() & Qt::ShiftModifier)   buttons |= NLMISC::shiftButton;
+	if(event->modifiers() & Qt::AltModifier)     buttons |= NLMISC::altButton;
+
+	if(event->delta() > 0)
+		Modules::objView().getDriver()->EventServer.postEvent(
+			new NLMISC::CEventMouseWheel(-fX, fY, (NLMISC::TMouseButton)buttons, true, NULL));
+	else
+		Modules::objView().getDriver()->EventServer.postEvent(
+			new NLMISC::CEventMouseWheel(-fX, fY, (NLMISC::TMouseButton)buttons, false, NULL));
+}
+#endif // defined(NL_OS_WINDOWS) || defined(NL_OS_MAC)
+
+
 #if defined(NL_OS_WINDOWS)
 
 typedef bool (*winProc)(NL3D::IDriver *driver, HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
diff --git a/code/nel/tools/3d/object_viewer_qt/src/graphics_viewport.h b/code/nel/tools/3d/object_viewer_qt/src/graphics_viewport.h
index b49734776..6dd6632c7 100644
--- a/code/nel/tools/3d/object_viewer_qt/src/graphics_viewport.h
+++ b/code/nel/tools/3d/object_viewer_qt/src/graphics_viewport.h
@@ -80,6 +80,10 @@ private Q_SLOTS:
 protected:
 	virtual void resizeEvent(QResizeEvent *resizeEvent);
 
+#if defined(NL_OS_WINDOWS) || defined(NL_OS_MAC)
+	virtual void wheelEvent(QWheelEvent *event);
+#endif
+
 #if defined(NL_OS_WINDOWS)
 	virtual bool winEvent(MSG *message, long *result);
 #elif defined(NL_OS_MAC)