[vtkusers] saving and restoring views

[Malcolm Drummond]

Hi

The following procs work in a Tcl script I'm running under vtk 3.2. My guess
would be that the call to SetDistance is unnecessary and causes
re-computation - but I  haven't looked at the source code, it might be a vtk
4.0 thing. (btw I agree it would be a nice feature to set font sizes, for
any overlay objects, and not have them resize. Is anyone working on this?)

proc app::GetCurrentView {} {
 set cam [ren GetActiveCamera]
 set cp [$cam GetPosition]
 set fp [$cam GetFocalPoint]
 set vu [$cam GetViewUp]
 set cr [$cam GetClippingRange]
 return "{$cp} {$fp} {$vu} {$cr}"
}

proc app::SetView {view} {
 set cam [ren GetActiveCamera]
 eval $cam SetPosition [lindex $view 0];
 eval $cam SetFocalPoint [lindex $view 1];
 eval $cam SetViewUp [lindex $view 2];
 eval $cam SetClippingRange [lindex $view 3];
 $cam ComputeViewPlaneNormal;
 set lights [ren GetLights];
 $lights InitTraversal;
 set light [$lights GetNextItem];
 eval $light SetPosition [lindex $view 0];
 eval $light SetFocalPoint [lindex $view 1];
 app::Render
}

----- Original Message -----
From: Ted Christiansen <ted at caept.com>
To: <vtkusers at public.kitware.com>
Sent: Tuesday, April 09, 2002 9:02 PM
Subject: [vtkusers] saving and restoring views


> Hello,
>
> I am trying to save and restore a view.  Everything works except for the
> zoom.  Any suggestions?
>
> Ted
>
> Here is the code to save the view:
>
> vtkCamera *cam = view->Renderer->GetActiveCamera();
> // save view
> cam->GetPosition(m_vtkposition[0], m_vtkposition[1], m_vtkposition[2]);
> cam->GetFocalPoint(m_vtkfocalpoint[0], m_vtkfocalpoint[1],
> m_vtkfocalpoint[2]);
> m_vtkviewangle = cam->GetViewAngle();
> cam->GetViewUp(m_vtkviewup[0], m_vtkviewup[1], m_vtkviewup[2]);
> m_distance = cam->GetDistance();
>
>
>
> Here is the code to show the previously saved view:
>
> vtkCamera *cam = view->Renderer->GetActiveCamera();
>
> // show view
> cam->SetPosition(m_vtkposition[0], m_vtkposition[1], m_vtkposition[2]);
> cam->SetFocalPoint(m_vtkfocalpoint[0], m_vtkfocalpoint[1],
> m_vtkfocalpoint[2]);
> cam->SetViewAngle(m_vtkviewangle);
> cam->SetViewUp(m_vtkviewup[0], m_vtkviewup[1], m_vtkviewup[2]);
> cam->SetDistance(m_distance);
>
>
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