[vtkusers] Re: Error msg when destroying a vtkTkRenderWidget

[Roger Blum]

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



"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
>
>
> hth
>
>
> Goodwin
>
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