[vtkusers] Display Coordinates Doesn't Change After Translation

[David Doria]

On Sat, Oct 29, 2011 at 5:24 AM, Wenlong Wang <scc.wwl at gmail.com> wrote:

> Dear all,
>
> I'm trying to translate my actor (a polydata mesh) with vtkTransform and
> vtkTransformFilter. What I want to do is translate my actor and get the
> difference of display coordinates of some specific points.
>
> My current method is like follows
> *
> //-----------Translation finished above----------------------
> for (int i = 0; i< 14; i++)
>     {
>         points->GetPoint(landmarks[i], newcoord[i]);
>         ren->SetWorldPoint(newcoord[i]);
>         ren->WorldToDisplay();
>         ren->GetDisplayPoint(newcoord[i]);
>     }
> //-----------------------------------------------------------------------*
>
> However, the display coordinates after the translation are the same as
> before translation. And as I tested, the actor position and camera
> position were not changed after the translation. Even the actor did move to
> another position on the screen.
>
> Is there any other method to achieve it?
>
> Thank you very much for your kindly help.
>
> Best wishes
> Long
>

Why don't you just transform the actor instead of the data?

Take a look at these:

https://docs.google.com/present/edit?id=0AcyIfGqnlfSoZGdqaGhnMnJfMjY1aGJqZGZ4ZnQ&hl=en
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/TransformActor

David
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