[vtkusers] How to find the "view trasformation" after a 3D camera operation?

[Veerapuram Varadhan]

Hi Amy,
The current version that I am using is good old 3.x, i have no choice,
other than working in 3.x, since my client doesn't want to port it to
4.x :)

Anyway, i will try porting GetViewTransformMatrix to 3.x.

Also, is there a way to pick a textactor?

Thanks,
V. Varadhan.

On Fri, 16 Jul 2004 10:33:24 -0400, Amy Henderson
<amy.henderson at kitware.com> wrote:
> What version of VTK are you using? In versions since at least 4.0, there
> are methods in vtkCamera called GetViewTransformObject (which returns a
> vtkTransform) and GetViewTransformMatrix (which returns a vtkMatrix4x4).
> 
> - Amy
> 
> 
> 
> At 10:21 AM 7/16/2004, Veerapuram Varadhan wrote:
> >Hi All,
> >
> >I am trying to use camera->GetViewTransform(); but VTK says it is
> >deprecated.  Can anyone help me in finding the transformation of a
> >co-ordinate point (in world co-ordinates) after any of zoom, rotate,
> >fly-in, fly-out operations?
> >
> >Basically, i am creating a "text annotation" widget.  Since, i was not
> >able to pick a text actor through vtkCellPicker or vtkPropPicker, I
> >have implemented my own (brut-forth) algorithm to pick the widget.  It
> >checks whether the relevant mouse event has occurred within the
> >bounding box of the text actor and does the picking.
> >
> >But this algorithm, seems to be not working when we do Zoom or rotate
> >or fly or any operation that would transform the co-ordinate.
> >
> >Any help in this regard would be greatly appreciated.
> >
> >TIA,
> >
> >V. Varadhan.
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