[vtkusers] Set VTKCamera intrinsics

[alykhantejani]

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] 
> </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
>
>
>
>
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