[vtkusers] Set VTKCamera intrinsics

[Bill Lorensen]

Please keep the list cc'ed for these emails.

VTK's camera is opengl oriented.

Position, FocalPoint, ViewUp, and ViewAngle are the parameters. I'm not
sure how these map to camera intrinsics.



On Fri, Aug 2, 2013 at 12:56 PM, Alykhan Tejani <
alykhan.tejani06 at imperial.ac.uk> wrote:

>  Yes it would be great if there was a clearer version, but I guess I'm
> asking if by setting the view angle are we effectively using the
> intrinsics? i.e. do you know if vtk works out the focal length and the
> principle point from this information?
>
> Thanks
>
>
> On 02/08/13 17:55, Bill Lorensen wrote:
>
> Yes, but the method is SetViewAngle.
>
>
>
> On Fri, Aug 2, 2013 at 12:52 PM, alykhantejani <
> alykhan.tejani06 at imperial.ac.uk> wrote:
>
>> I know we can set the viewing angle with vtkCamera::SetViewingAngle and
>> also the focal length can then be determined from this angle and the image
>> dimensions. Additionally the principle point can be worked out from the
>> image dimensions. So does the vtkCamera make use of the viewing angle?
>>
>> Thanks
>>
>>
>>
>> On 02/08/13 17:48, Bill Lorensen [via VTK] wrote:
>>
>>  It would be great to have a vtkCalibratedCamera (or something) that
>> would take the cameras intrinsic parameters.
>>
>>  The Point Cloud Library (PCL) http://www.pointclouds.org/ uses VTK for
>> rendering. PCL may already have such a beast or at least a conversion from
>> intrinsics to vtkCamera.
>>
>>
>>
>>
>> On Fri, Aug 2, 2013 at 12:14 PM, alykhantejani <[hidden email]<http://user/SendEmail.jtp?type=node&node=5722399&i=0>
>> > wrote:
>>
>>> I am trying to render views of a 3D mesh in VTK, I am doing the
>>> following:
>>>
>>>
>>>     vtkSmartPointer<vtkRenderWindow> render_win =
>>> vtkSmartPointer<vtkRenderWindow>::New();
>>>     vtkSmartPointer<vtkRenderer> renderer =
>>> vtkSmartPointer<vtkRenderer>::New();
>>>
>>>     render_win->AddRenderer(renderer);
>>>     render_win->SetSize(640, 480);
>>>
>>>     vtkSmartPointer<vtkCamera> cam = vtkSmartPointer<vtkCamera>::New();
>>>
>>>     cam->SetPosition(50, 50, 50);
>>>     cam->SetFocalPoint(0, 0, 0);
>>>     cam->SetViewUp(0, 1, 0);
>>>     cam->Modified();
>>>
>>>     vtkSmartPointer<vtkActor> actor_view =
>>> vtkSmartPointer<vtkActor>::New();
>>>
>>>     actor_view->SetMapper(mapper);
>>>     renderer->SetActiveCamera(cam);
>>>     renderer->AddActor(actor_view);
>>>
>>>     render_win->Render();
>>>
>>> I am trying to simulate a rendering from a calibrated Kinect, for which I
>>> know the intrinsic parameters. How can I set the intrinsic parameters
>>> (focal
>>> length and principle point) to the vtkCamera.
>>>
>>> I wish to do this so that the 2d pixel - 3d camera coordinate would be
>>> the
>>> same as if the image were taken from a kinect.
>>>
>>> Thanks
>>>
>>>
>>>
>>>
>>> --
>>> View this message in context:
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>>
>>
>>
>> --
>> Unpaid intern in BillsBasement at noware dot com
>>
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>
>
> --
> Unpaid intern in BillsBasement at noware dot com
>
>
>


-- 
Unpaid intern in BillsBasement at noware dot com
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