[vtkusers] QVTKWidget camera problem

[DL I]

Hi Gib,

maybe try removing

iren->Initialize();

and calling
ren->ResetCamera();
after you have added the actor(s)?


- Dean



On Tue, Nov 17, 2015 at 3:03 PM, Gib Bogle <g.bogle at auckland.ac.nz> wrote:

> Thanks for the suggestions, Ken.  Neither had any effect, unfortunately.
>
> Cheers
> Gib
> ------------------------------
> *From:* Ken Martin [ken.martin at kitware.com]
> *Sent:* Wednesday, 18 November 2015 8:28 a.m.
> *To:* Gib Bogle
> *Cc:* vtkusers at vtk.org
> *Subject:* Re: [vtkusers] QVTKWidget camera problem
>
> renderer->ResetCameraClippingRange()  maybe? That and
> camera->OrthogonalizeViewUp() are the two common things to try when manual
> camera changes do not work.
>
> Thanks
> Ken
>
> On Tue, Nov 17, 2015 at 2:15 PM, Gib Bogle <g.bogle at auckland.ac.nz> wrote:
>
>> I have now established conclusively that adjusting the camera setup with
>> SetPosition and SetFocalPoint stops the scene from being displayed, while
>> any movement of the mouse with a button down restores display.
>>
>> qvtkWidget = new QVTKWidget(page,QFlag(0));
>>
>> QVBoxLayout *layout = new QVBoxLayout;
>> layout->addWidget(qvtkWidget);page_VTK->setLayout(layout);ren = vtkRenderer::New();
>>
>> renWin = qvtkWidget->GetRenderWindow();
>>
>> renWin->AddRenderer(ren);
>>
>> ren->ResetCamera();
>> iren = qvtkWidget->GetInteractor();
>>
>> vtkSmartPointer<MouseInteractorStyle4> style = vtkSmartPointer<MouseInteractorStyle4>::New();
>>
>> iren->SetInteractorStyle( style );
>>
>> iren->Initialize();
>>
>> ren->GetActiveCamera()->SetPosition(0, 0, 0);ren->GetActiveCamera()->SetFocalPoint(x0, x0, x0);
>>
>>
>> If I remove the last two lines the scene is centred OK, but not at the
>> scale I want.  I can play with Zoom(), but SetFocalPoint(x0,x0,x0) ensures
>> that I get the desired scaling directly.
>> Is this the expected behaviour?  I'm wondering if it is the result of
>> using the QVTKWidget "default" camera instead of creating a new one to use
>> (please excuse deficiencies in my understanding).  Is Zoom() the only way
>> to achieve what I want?
>>
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>
>
> --
> Ken Martin PhD
> Chairman & CFO
> Kitware Inc.
> 28 Corporate Drive
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