[vtkusers] QVTKWidget camera problem

[Gib Bogle]

Hi Dean,

I have tried ren->ResetCamera() after adding the actors, it displays OK but with the default scaling (i.e. camera position etc), just the same as if I do it initially and never change the camera.

Cheers
Gib
________________________________
From: DL I [inglis.dl at gmail.com]
Sent: Wednesday, 18 November 2015 9:10 a.m.
To: Gib Bogle
Cc: Ken Martin; vtkusers at vtk.org
Subject: Re: [vtkusers] QVTKWidget camera problem

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<mailto: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<mailto:ken.martin at kitware.com>]
Sent: Wednesday, 18 November 2015 8:28 a.m.
To: Gib Bogle
Cc: vtkusers at vtk.org<mailto: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<mailto: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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