[vtkusers] Problem with very pixelated volume rendering

[Shashwath T.R.]

Try turning on linear interpolation in the volume property...

volumeProperty->SetInterpolationTypeToLinear();

Shash

On Wed, Jul 6, 2011 at 7:22 PM, Tijmen Klein <T.R.Klein at student.rug.nl>wrote:

> I'm trying to create a volume rendering. The output seems to be ok, but is
> very pixelated. It seems like the sampling resolution is too low. I tried
> adjusting the imageSampleDistance and autoAdjustSampleDistances, but the
> result was the same. My basic code looks like this:
>
>
> volumeMapper = vtkSmartPointer<vtkGPUVolumeRayCastMapper>::New();
> volumeMapper->SetInputConnection(reader[1]->GetOutputPort());
>
> vtkSmartPointer<vtkVolumeProperty> volumeProperty =
> vtkSmartPointer<vtkVolumeProperty>::New();
>
> vtkSmartPointer<vtkPiecewiseFunction> compositeOpacity =
>  vtkSmartPointer<vtkPiecewiseFunction>::New();
> compositeOpacity->AddPoint(0.0,0.0);
> compositeOpacity->AddPoint(40.0,1.0);
> volumeProperty->SetScalarOpacity(compositeOpacity);
>
> vtkSmartPointer<vtkColorTransferFunction> color =
>  vtkSmartPointer<vtkColorTransferFunction>::New();
> color->AddRGBPoint(0.0 , 0.23,0.30,0.75);
> color->AddRGBPoint(40.0, 0.8 ,0.05 ,0.4);
> color->SetColorSpaceToDiverging();
> volumeProperty->SetColor(color);
>
> vtkSmartPointer<vtkVolume> volume = vtkSmartPointer<vtkVolume>::New();
> volume->SetMapper(volumeMapper);
> volume->SetProperty(volumeProperty);
>
> The volume is the added to a renderer (I have multiple vtkRenderers but
> only 1 vtkRenderWindow). I'm also using QT (qvtk widget).
> And since a picture says more than a 1000 words, an example of what is
> looks like: http://dl.dropbox.com/u/27566470/pixels.png
> This is a crop (without resize) of a screenshot from my running program.
> All other (non volume) elements look fine.
>
> Does anyone have any idea how to solve this?
>
>
> Cheers,
> Tijmen
>
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