[vtkusers] volume rendering problem!

Mathieu Malaterre Mathieu.Malaterre at creatis.insa-lyon.fr
Tue Jul 8 06:57:43 EDT 2003


Paul,

This might be a problem with forward references. Could you please add a:

#include "vtkImageData.h"
or
#include "vtkStructuredPoints.h"

in case you forgot to supply them.


HTH
mathieu


Paul McGuinness wrote:
> John,
> 
> In more recent versions of the visualization toolkit
> vtkStructuredPointsReader has been replaced with vtkImageReader. For
> example vtkVolumeRayCastMapper use to take vtkStructuredPointsData
> objects as input, but in the current version of vtk vtkVolumeRayCastMapper
> takes vtkImageData as the input. Using vtkImageReader instead of
> vtkStructuredPointsReader is causing some problems because I cannot find a
> similar example where vtkImageReader has been used for volume rendering.
> 
> Paul
> 
> 
> On Mon, 7 Jul 2003 anast.jm at pg.com wrote:
> 
> 
>>Paul,  vtkImageReader doesn't read VTK format data files....try using
>>vtkStructurePointsReader ....john
>>
>>
>>
>>Internet Mail Message
>>Received from host:     public.kitware.com [24.97.130.19]
>>
>>
>>
>>Paul McGuinness <mcguinpg at maths.tcd.ie>
>>Sent by: vtkusers-admin at vtk.org
>>07/04/2003 10:10 AM
>>
>>
>>        To:     vtkusers at vtk.org
>>        cc:     (bcc: John Anast-JM/PGI)
>>        Subject:        [vtkusers] volume rendering problem!
>>
>>
>>
>>Hi All,
>>
>>I am having a problem displaying the volume rendering of ironProt.vtk. The
>>code compiles, and the display window appears but there is no rendering in
>>the window, the window is just empty. Can someone please help me, I am
>>reading in the file using vtkImageReader and using vtkImageCast to convert
>>it to unsigned-short. Then vtkVolumeRayCastMapper sets its input to the
>>vtkImageCast object's output, see below. I am using vtk4.2.2.
>>Please can someone help,
>>Happy 4th July,
>>Paul.
>>
>>
>>int main( int argc, char *argv[] )
>>         {
>>vtkRenderer *ren1 =vtkRenderer::New();
>>vtkRenderWindow *renWin=vtkRenderWindow::New();
>>    renWin->AddRenderer(ren1);
>>vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
>>    iren->SetRenderWindow(renWin);
>>
>>vtkImageReader *reader =vtkImageReader::New();
>>reader->SetFileName("ironProt.vtk");
>>
>>
>>vtkImageCast *imgcas = vtkImageCast::New();
>>imgcas->SetInput(reader->GetOutput());
>>imgcas->SetOutputScalarTypeToUnsignedShort();
>>
>>
>>vtkPiecewiseFunction *opacityTransferFunction =
>>vtkPiecewiseFunction::New();
>>    opacityTransferFunction->AddPoint(20,   0.0);
>>    opacityTransferFunction->AddPoint(255,  0.2);
>>
>>vtkColorTransferFunction *colorTransferFunction =
>>vtkColorTransferFunction::New();
>>    colorTransferFunction->AddRGBPoint( 0.0, 0.0, 0.0, 0.0);
>>    colorTransferFunction->AddRGBPoint(64.0, 1.0, 0.0, 0.0);
>>    colorTransferFunction->AddRGBPoint(128.0, 0.0, 0.0, 1.0);
>>    colorTransferFunction->AddRGBPoint(192.0, 0.0, 1.0, 0.0);
>>    colorTransferFunction->AddRGBPoint(255.0, 0.0, 0.2, 0.0);
>>
>>vtkVolumeProperty *volumeProperty = vtkVolumeProperty::New();
>>    volumeProperty->SetColor(colorTransferFunction);
>>    volumeProperty->SetScalarOpacity(opacityTransferFunction);
>>    volumeProperty->ShadeOn();
>>    volumeProperty->SetInterpolationTypeToLinear();
>>
>>vtkVolumeRayCastCompositeFunction  *compositeFunction=
>>vtkVolumeRayCastCompositeFunction::New();
>>vtkVolumeRayCastMapper *volumeMapper = vtkVolumeRayCastMapper::New();
>>    volumeMapper->SetVolumeRayCastFunction(compositeFunction);
>>    volumeMapper->SetInput(imgcas->GetOutput());
>>
>>vtkVolume *volume = vtkVolume::New();
>>    volume->SetMapper(volumeMapper);
>>    volume->SetProperty(volumeProperty);
>>
>>ren1->AddVolume(volume);
>>ren1->SetBackground(1, 1 ,1);
>>renWin->SetSize(600, 600);
>>renWin->Render();
>>iren->Start();
>>
>>}
>>
>>
>>
>>_______________________________________________
>>This is the private VTK discussion list.
>>Please keep messages on-topic. Check the FAQ at:
>><http://public.kitware.com/cgi-bin/vtkfaq>
>>Follow this link to subscribe/unsubscribe:
>>http://www.vtk.org/mailman/listinfo/vtkusers
>>
>>
>>
> 
> 
> _______________________________________________
> This is the private VTK discussion list. 
> Please keep messages on-topic. Check the FAQ at: <http://public.kitware.com/cgi-bin/vtkfaq>
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers
> 


-- 
Mathieu Malaterre
CREATIS
28 Avenue du Doyen LEPINE
B.P. Lyon-Montchat
69394 Lyon Cedex 03
http://www.creatis.insa-lyon.fr/~malaterre/




More information about the vtkusers mailing list