[vtkusers] about ray casting pipeline

[Yixun Liu]

Hi,

I build a pipeline as:

 vtkPiecewiseFunction *tfun = vtkPiecewiseFunction::New();
 vtkColorTransferFunction *ctfun = vtkColorTransferFunction::New();
 vtkVolumeRayCastCompositeFunction *compositeFunction = vtkVolumeRayCastCompositeFunction::New();
 vtkVolumeRayCastMapper *volumeMapper = vtkVolumeRayCastMapper::New();
 vtkVolumeProperty *volumeProperty = vtkVolumeProperty::New();
 vtkVolume *volume = vtkVolume::New();


 volumeMapper->SetInput(threeDImage);//threeDImage point to a vtkImageData
 volumeMapper->SetVolumeRayCastFunction(compositeFunction);
 volumeProperty->SetColor(ctfun);
 volumeProperty->SetScalarOpacity(tfun);
 
 volume->SetMapper(volumeMapper);
 volume->SetProperty(volumeProperty);


However, when I change the threeDImage, e.g changing it from  256x256x48 to 512x512x180,  the pipeline cannot visualize correctly. It seem that only part of 512x512x180 image can be visualized.

Thanks!



Regards,

Yixun Liu
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