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

[Veerapuram Varadhan]

Hi Amy,

I just found that GetViewTransformMatrix is already available in my
version of VTK.  BTW, i am using the VTK that came with 0.6 of
paraview. ;)

V. Varadhan.

On Fri, 16 Jul 2004 20:14:39 +0530, Veerapuram Varadhan
<v.varadhan at gmail.com> wrote:
> 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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