Hi Albert,
Can you try changing this position vector.
currentCamera->SetPosition(0.0,0.0,0.0);
in my observation setPosition actually defines direction vector in which
camera is looking at the object.
So I think it should have some direction .
For e.g to look at same object in 3 different directions(standard x,y,z) I
do this
case 0:
cam->SetFocalPoint(0,0,0);
cam->SetPosition(1,0,0);
cam->SetViewUp(0,0,1);
break;
case 1:
cam->SetFocalPoint(0,0,0);
cam->SetPosition(0,-1,0);
cam->SetViewUp(0,0,1);
break;
case 2:
cam->SetFocalPoint(0,0,0);
cam->SetPosition(0,0,1);
cam->SetViewUp(0,1,0);
break;
regards,
Girish
On 24 February 2017 at 19:50, Albert Alises <[email protected]> wrote:
> Hello Ingmar,
>
> Thank you for your response! I did try to do that but unfortunately the
> scene keeps going black after executing these changes. Calling any event on
> the window makes the view to render correctly (wheel event, or just moving
> around), so it has to be a method called when doing that on a
> QmitkRenderWindow, just cannot seem to find it...
>
> Thank you,
> Albert.
>
> 2017-02-24 15:05 GMT+01:00 Ingmar Wegner <[email protected]>:
>
>> 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 <[email protected]> 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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>>
>
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thanks & regards,
Girish
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