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

[Veerapuram Varadhan]

Hi Amy/All,

Does the values returned by camera->GetViewTransformMatrix() are
represented in Viewport co-ordinates?

V. Varadhan.

On Fri, 16 Jul 2004 20:23:04 +0530, Veerapuram Varadhan
<v.varadhan at gmail.com> wrote:
> 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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