changed ctrl+wheel by shift+wheel

openglcanvas.cpp

@@ -677,7 +677,7 @@ void OpenGLCanvas::mouseMoveEvent(QMouseEvent *event){
 
 void OpenGLCanvas::wheelEvent(QWheelEvent *event){
     if(event->orientation()==Qt::Vertical){
-        if(event->modifiers()==Qt::ControlModifier){
+        if(event->modifiers()==Qt::ShiftModifier){
             change_fov_max(fov_max+((double)event->delta())/30);
         }else{
             change_fov(fov+((double)event->delta())/30);