Re: [mitk-users] Render vtkCamera position update on QMitkRenderWindow

[Ingmar Wegner]

Hi Albert,
did you try orthogonalizing the view up vector before calling RequestUpdate?

currentCamera->OrthogonalizeViewUp();

mitk::RenderingManager::GetInstance()->RequestUpdateAll(mitk::RenderingManager::REQUEST_UPDATE_3DWINDOWS);// For 3D widget only

This recomputes the view up vector to force it to be perpendicular to camera->focal point vector. (See vtkCamera docu)

Ingmar

(Written on cellphone)

Am 24.02.2017, 13:13, Albert Alises <ironicpsy...@gmail.com> schrieb:

Hello everyone,

I am having trouble rendering the update of a vtkCamera on a QMitkRenderWindow. I have a renderWindow which looks at a given scene. I get its associated vtkRenderWindow and from it, the ActiveCamera() (Which is a vtkCamera object).

I then modify the position and the view of that camera by doing that:

currentCamera->SetPosition(0.0,0.0,0.0);
currentCamera->SetViewUp(1.0,0.0,0.0);
currentCamera->SetFocalPoint(0.7, 0.3, 0.4);
vtkTransform* translationToPoint = vtkTransform::New();
translationToPoint->Translate(40, 20, 30);
currentCamera->ApplyTransform(translationToPoint);

After applying these transformations, the renderwindow turns black, which suggests that the render has not been updated. I have tried:

currentCamera->Modified();
this->RequestRenderWindowsUpdate();

Paint method of the Base Renderer from MITK

vtkRenderWindow->Update();

and rendering the camera, render windows, renderer associated.... None of them is working though.... However, the rendering is updated correctly when scrolling on the window with the mouse. Which method is the correct one to call for the window to show the new scene after modifying the vtkCamera associated to a the window? (the one the WheelEvent method on the QMitkRenderWindows seems to call).

Thank you very much,

Albert.

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