[vtkusers] 2D Zooming

[Raphael Sebbe]

Did not try that yet, but I think vtkActor2D/vtkImageMapper does not 
use camera settings at all (it has its own view transform pipeline). Is 
that right ?

Raphael

On Wednesday, September 25, 2002, at 10:55 AM, Nathan Smith wrote:

> Did you try changing the Dolly distance on the camera associated with 
> the
> renderer? This will do what you want. Rather than rendering the image
> larger in the mapping phase, this "zooms" in on the final rendered 
> image.
> You could even do this before any display is made, to knock out any
> intermediate changes in the render-window image.
>
> renderer->GetActiveCamera()->Dolly(value)
>
> Nate
>
> On Wed, 25 Sep 2002, Raphael Sebbe wrote:
>
>> Hi all,
>>
>> I have an array of tiff images loaded in VTK that I display, one slice
>> at a time, 2 different ways:
>>
>> - 2D, vtkActor2D/vtkImageMapper
>> - 3D, vtkImageActor
>>
>> For the 2D display solution, I'd like to be able to zoom the image, 
>> but
>> could not achieve that so far. I tried
>>
>> imageMapper->UseCustomExtentsOn();
>> imageMapper->SetCustomDisplayExtents(extents);
>>
>> but the rendered image is tiled, not zoomed.
>>
>> Raphael
>
>