[vtkusers] vtkImageData - translating the origin

[Dženan Zukić]

I think in VTK the origin is the lower-left corner.

On Fri, Dec 23, 2011 at 09:18, emreturkoz <emreturkoz at gmail.com> wrote:

> I have a set of DICOM images which I read using ITK capabilities and
> convert
> into a VTK image then visualize using vtkImageViewer2.
>
> I want to create a new image data and visualize these two datasets together
> in one window. The problem is that the origin of the image that I created
> is
> always located on the lower end corner of the first image. I tried
> "SetOrigin" of image data but it doesn't work. What should I do to change
> the origin of the image? I use the following code:
>
>        vtkImageData *image = vtkImageData::New();
>        image->SetExtent(0,60,0,60,0,7);
>        image->SetOrigin(10,10,4);
>        image->SetDimensions(61,61,8);
>        image->SetSpacing(1,1,1);
>        image->Update();
>
>        int* dims = image->GetDimensions();
>        for (int z = 0; z < dims[2]; z++)
>        {
>                for (int y = 0; y < dims[1]; y++)
>                {
>                        for (int x = 0; x < dims[0]; x++)
>                        {
>                                double* pixel =
> static_cast<double*>(image->GetScalarPointer(x,y,z));
>                                pixel[0] = 120;
>                                pixel[1] = 255;
>                                pixel[2] = 120;
>                        }
>                }
>        }
>        image->SetScalarType(4);
>
>        vtkImageBlend *blend = vtkImageBlend::New();
>        blend->AddInput(itkvtkglue->GetOutput());
>        blend->AddInput(image);
>        blend->PRESERVES_RANGES();
>        blend->SetOpacity(0,1.0);
>        blend->SetOpacity(1,.4);
>
>        pViewerXY->SetInput(blend->GetOutput());
>
>
>
>
> --
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