[vtkusers] What Is Wrong With My VTK Pipeline ?

[JohnMark]

Hi , vtkusers ,
    I have been testing some examples of cells during these days . and I find an interesting class : 
vtkImageMandelbrotSource , because its output can be used by volume rendering , although the volume 
rendering is unstructured grid volume rendering . 
    and I find it has an input method : SetInputConnection(vtkDataObject *) , so I think it may be OK 
if I take the output of class vtkVolume16Reader as its input , but , luckily , I get an error : 
Attempt to connect input port index 0 for an algorithm with 0 input ports . but in other examples of 
volume rendering , there is not any error like this , and all of them work well . so I don't think 
there is 0 input ports .
    the codes is just as follows :
 
vtkVolume16Reader *reader = vtkVolume16Reader::New();//**** the v16 codes is no problem , I have test it many times .  reader->SetDataDimensions(64,64);  reader->SetImageRange(1,93);  reader->SetDataByteOrderToLittleEndian();  reader->SetFilePrefix("../headsq/quarter");  reader->SetDataSpacing(3.2, 3.2, 1.5); 
vtkImageMandelbrotSource *input = vtkImageMandelbrotSource::New();  input->SetInputConnection(reader->GetOutputPort()); 
 
so there are my problems : 
    1、of course , vtkImageMandelbrotSource can create images by itself , is it real that 
vtkImageMandelbrotSource can not take other images as input ports ? 
    2、if it is so , all the unstructured grid volume rendering methods can not take random images 
as their input ports ? if it is not , what should I do before I send the images (like .dcm images) to 
vtkImageMandelbrotSource  ?  
    and I have tried vtkUnstructuredGridAlgorithm , it can transform the images to unstructured grid , 
just as the unstructured grid volume rendering requires , but it doesn't work .
    or in other words , these methods , like vtkUnstructuredGridVolumeZSweepMapper , can not be used 
by the medical  visualization system , so which field can they be used ?
 
    thank you with great regards !
    
    Mark 
 
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