mouse wheel event position incorrect in vtkMFCWindow
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
The mouse wheel event position acquired through vtkMFCWindow::OnMouseWheel is in screen coordinates. The vtkWin32RenderWindowInteractor functionality requires that this position is in client coordinates. This should be handled in a similar way to how it is handled in vtkWin32RenderWindowInteractor::vtkHandleMessage2. The simplest fix is to call "ScreenToClient(&point);" at the start of vtkMFCWindow::OnMouseWheel.
Even though the wheel doesn't "click", the position at mouse wheel event can be useful to distinguish between different renderers in a split viewport.