[vtkusers] Trying to read a set of jpg slices

[Bill Lorensen]

1) Are all slices in one file?
    If so, SetFileDimensionality=3
    SetFileName to the name of the single file. DO NOT use //, instead use /
2) Is each slice in it's own file? c:/A/B/foo.1 c:/A/B/foo.2 ...
   SetFilePrefix to c:/A/B/foo.


On Tue, Sep 25, 2012 at 12:37 AM, Rodrigo Lovera
<lobo.theslayer at gmail.com>wrote:

> Hello everyone,
>
> I've been reading and testing vtk examples in c++ in order to get into it,
> but i'm getting stucked in some problem, how do correctly read a series of
> jpg slices and use them for volume rendering. I've trying to read the
> directory containing the data but it gives errors, it's like if it were
> asking for a file like "something.1" instead of waiting for the jpg data
> set. I've been reading some papers where they use the jpegreader for that
> but can't get it to work. Any help or advice 'll ve much appreciate.
>
> The errors i'm getting are the following
>
> ERROR: In C:\Users\RODRIGO LOVERA\Documents\PUCP\Tesis\VTK
> 5.10\VTK\IO\vtkJPEGReader.cxx, line 93
> vtkJPEGReader (035651B0): Unable to open file
> C://VTK5.10//DATA//MatlabTest//JPG//.1
>
> ERROR: In C:\Users\RODRIGO LOVERA\Documents\PUCP\Tesis\VTK
> 5.10\VTK\VolumeRendering\vtkVolumeRayCastMapper.cxx, line 326
> vtkVolumeRayCastMapper (03574310): Cannot volume render data of type
> short, only unsigned char or unsigned short.
>
> ERROR: In C:\Users\RODRIGO LOVERA\Documents\PUCP\Tesis\VTK
> 5.10\VTK\VolumeRendering\vtkVolumeRayCastMapper.cxx, line 326
> vtkVolumeRayCastMapper (03574310): Cannot volume render data of type
> short, only unsigned char or unsigned short.
>
> ERROR: In C:\Users\RODRIGO LOVERA\Documents\PUCP\Tesis\VTK
> 5.10\VTK\VolumeRendering\vtkVolumeRayCastMapper.cxx, line 326
> vtkVolumeRayCastMapper (03574310): Cannot volume render data of type
> short, only unsigned char or unsigned short.
>
> and the code i'm trying to run is these:
>
> int main()
> {
> vtkRenderer *aRender = vtkRenderer::New();
>  vtkRenderWindow *renWin = vtkRenderWindow::New();
> renWin->AddRenderer(aRender);
>  vtkRenderWindowInteractor *iRen = vtkRenderWindowInteractor::New();
> iRen->SetRenderWindow(renWin);
>  vtkJPEGReader *jpegReader = vtkJPEGReader::New();
> jpegReader->SetDataByteOrderToLittleEndian();
> // jpegReader->SetFilePattern("");
> jpegReader->SetFilePrefix("C://VTK5.10//DATA//MatlabTest//JPG//");
>  jpegReader->SetDataExtent(0, 1280, 0, 1024, 1, 11);
> jpegReader->SetDataSpacing(3.2, 3.2, 20);
>  jpegReader->SetDataOrigin(0, 0, 0);
>   vtkPiecewiseFunction *opacityTransferFunction =
> vtkPiecewiseFunction::New();
> opacityTransferFunction->AddPoint(0, 0.0);
>  opacityTransferFunction->AddSegment(30, 0.0, 100, 0.9);
> opacityTransferFunction->AddPoint(110, 2.0);
>  opacityTransferFunction->ClampingOn();
>  vtkVolumeProperty *volumeProperty = vtkVolumeProperty::New();
>  volumeProperty->SetScalarOpacity(opacityTransferFunction);
> volumeProperty->ShadeOn();
>  volumeProperty->SetInterpolationTypeToLinear();
>  vtkVolumeRayCastCompositeFunction *compositeFunction =
> vtkVolumeRayCastCompositeFunction::New();
>  vtkVolumeRayCastMapper *volumeMapper = vtkVolumeRayCastMapper::New();
> volumeMapper->SetVolumeRayCastFunction(compositeFunction);
>  volumeMapper->SetInput(jpegReader->GetOutput());
>
> vtkVolume *volume = vtkVolume::New();
>  volume->SetMapper(volumeMapper);
> volume->SetProperty(volumeProperty);
>
> vtkCamera *camera = vtkCamera::New();
> camera->SetViewUp(0,0,1);
>         camera->SetPosition(0,2,0);
> camera->SetFocalPoint(0,0,0);
> camera->Dolly(0.8);
>
>   aRender->AddVolume(volume);
> aRender->SetBackground(0.5, 0.5, 0.5);
>
> renWin->SetSize(600, 600);
> renWin->Render();
>
>  iRen->Initialize();
> iRen->Start();
>
>
> return 0;
>  }
>
> Thx in advance.
>
> --
> *Rodrigo Lovera*
>
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-- 
Unpaid intern in BillsBasement at noware dot com
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