[vtkusers] vtkImageReslice produce wrong output dimension?

[TrackVis Admin]

Thanks for the reply! I'm using VTK 5.6. There doesn't seem be a
GetMapper() method in vtkImageActor. There is a BorderOn() option in
vtkImageReslice, however. But it doesn't help.

RP


On Fri, May 31, 2013 at 1:48 PM, David Gobbi <david.gobbi at gmail.com> wrote:

> When you feed a 128x128x2 image into vtkImageActor, it displays it
> with a size of 127x127x1.  It cuts off the outer half of every edge
> pixel.
>
> Try calling actor->GetMapper()->BorderOn() to see if this fixes the
> problem.
>
>  - David
>
> On Fri, May 31, 2013 at 11:10 AM, TrackVis Admin <trackvis at gmail.com>
> wrote:
> > Hi all,
> >
> > I've been trying to use vtkImageReslice to display a 3D image volume as
> > image slice. Here is what I did:
> >
> >     vtkImageReslice* reslice = vtkImageReslice::New();
> >     reslice->SetInput( image_data );
> >     reslice->BorderOn();
> >     reslice->AutoCropOutputOn();
> >
> >     // This sets us to extract slices.
> >     reslice->SetOutputDimensionality( 2 );
> >
> >     // This will change depending what orienation we're in.
> >     reslice->SetResliceAxesDirectionCosines( 1, 0, 0,
> >         0, 1, 0,
> >         0, 0, 1 );
> >
> >     // Image to colors using color table.
> >     vtkImageMapToColors* colormap = vtkImageMapToColors::New();
> >     colormap->SetLookupTable( some_lookup_table );
> >     colormap->SetInputConnection( reslice->GetOutputPort() );
> >
> >     vtkImageActor* actor = vtkImageActor::New();
> >     actor->SetInput( colormap->GetOutput() );
> >
> > Everything appears to be fine until I applied it on a single slice
> volume.
> > For example, if the input volume has dimension of 128x128x1. I would
> expect
> > it show a thin line on X or Y plane with dimension of 128x1. However, I
> see
> > nothing! If I use a volume of 128x128x2, I only see 1 line of pixels on
> X or
> > Y plane, where I expect to see 2 lines (128 x 2). Did I do anything
> wrong?
> > Why does it look like that 1 slice of the data is missing?
> >
> > Thank you!
> > RP
>
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