[vtkusers] volume rendering problem!

[anast.jm at pg.com]

Paul,  vtkImageReader doesn't read VTK format data files....try using 
vtkStructurePointsReader ....john



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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();

}



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