[vtkusers] Re: Error msg when destroying a vtkTkRenderWidget

Roger Blum roger_blum at swissonline.ch
Wed Jun 14 20:45:29 EDT 2006

Hi Goodwin,

Thanks for this hint. Clicking the destroy button is fine.


"Goodwin Lawlor" <goodwin.lawlor at ucd.ie> schrieb im Newsbeitrag 
news:e6pd0g$as$1 at sea.gmane.org...
> Roger Blum wrote:
>> Thanks a lot for your answer. It was in fact the interactor which was not 
>> deleted and caused the warning.
>> Thanks for the sample code for handling the closing of a window and 
>> dealing with vtk error messages / warnings, too.
>> This helps me a lot.
>> Roger
> Hi Roger,
> Actually, looking at the code again... pressing "e" causes a crash. It 
> happens when the ExitEvent is invoked but iren's "this->Start" points to 
> an observer that has been deleted. I haven't got time to find out what's 
> going on. Maybe someone will pick it up again in the future.
> Clicking the destroy button in the title bar works ok though.
> Goodwin
>> "Goodwin Lawlor" <goodwin.lawlor at ucd.ie> schrieb im Newsbeitrag 
>> news:e6mn20$vt0$1 at sea.gmane.org...
>>> Roger Blum wrote:
>>>> Hi vtk users,
>>>> I have an application written in Tcl which displays a scene of 
>>>> different actors. The user can select one actor to display in a 
>>>> separate window.
>>>> To acheive this I create a new toplevel widget with an embedded 
>>>> vtkTkRenderWidget. I create a new mapper (as a shallow copy of the 
>>>> original mapper) and a new actor, which I add to the new renderer.
>>>> When I close this separate window the following warning is displayed:
>>>> Generic Warning: In 
>>>> C:\Dashboards\Releases\rc-VTK-5-0-0-rc1\VTK\Rendering\vtkTkRenderWidget.cxx, 
>>>> line 622
>>>> A TkRenderWidget is being destroyed before it associated 
>>>> vtkRenderWindow is destroyed. This is very bad and usually due to the 
>>>> order in which objects are being destroyed. Always destroy the 
>>>> vtkRenderWindow before destroying the user interface components.
>>>> How do I have to destroy/delete the vtk objects created for this 
>>>> separate window? I do not create a vtkRenderWindow explicitly. It is 
>>>> created by the vtkTkRenderWidget. I have tried to delete/destroy the 
>>>> objects in various sequences, nothing helped. A call to
>>>> [tkRenderWidget GetRenderWindow] Delete
>>>> caused error messages complaining about a non existing TempXYZ object.
>>> In short, you have to delete the interactor too (which is created for 
>>> you, if needed). Here's some code to destroy the window, either by 
>>> clicking the destroy button in the title bar or pressing "e".
>>> package require vtk
>>> package require vtkinteraction
>>> #console show
>>> wm withdraw .
>>> toplevel .w
>>> vtkTkRenderWidget .w.renWidget
>>> ::vtk::bind_tk_render_widget .w.renWidget
>>> pack .w.renWidget -expand 1 -fill both
>>> set renWin [.w.renWidget GetRenderWindow]
>>> vtkRenderer ren
>>>   $renWin AddRenderer ren
>>> wm protocol .w WM_DELETE_WINDOW cbCloseWindow
>>> set iren [$renWin GetInteractor]
>>> # remove the default callback to exit the app
>>> $iren RemoveObserver [::vtk::get_widget_variable_value $iren 
>>> ExitEventTag]
>>> $iren AddObserver ExitEvent cbCloseWindow
>>> proc cbCloseWindow {} {
>>>   set renWin [.w.renWidget GetRenderWindow]
>>>   set renCol [$renWin GetRenderers]
>>>   for {$renCol InitTraversal} {[set ren [$renCol GetNextItem]] ne ""} {} 
>>> {
>>>     $renWin RemoveRenderer $ren
>>>     $ren Delete
>>>   }
>>>   set iren [$renWin GetInteractor]
>>>   $renWin Delete
>>>   $iren Delete
>>>   destroy .w
>>> }
>>>> As a quick and dirty solution: Can I prevent vtk from showing the 
>>>> vtkOutputWindow?
>>> You can direct the error messages to a file using vtkFileOutputWindow
>>> (eg)
>>> vtkFileOutputWindow outputFile
>>>   outputFile SetFileName errors.log
>>>   outputFile SetInstance outputFile
>>> or just switch them off:
>>>     vtkObject obj
>>>     obj GlobalWarningDisplayOff
>>>     obj Delete
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