[vtkusers] vtkVolumeRayCastMapper under vtk 4.2

[Juan Aja]

Hi to all.
I found a thread 
(http://public.kitware.com/pipermail/vtkusers/2003-July/068382.html and 
http://public.kitware.com/pipermail/vtkusers/2003-July/068402.html, 
basically he posted it twice with different titles) asking about the same 
problem, but as no one answered I considered posting this:

I've been trying to compile the example found in: 
http://public.kitware.com/cgi-bin/cvsweb.cgi/Examples/VolumeRendering/Tcl/SimpleRayCast.tcl?rev=1.3&view=markup
(it's the Simple raycast example, written in Tcl), I converted it to C++, 
thus resulting in:


#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkStructuredPointsReader.h"
#include "vtkPiecewiseFunction.h"
#include "vtkVolumeProperty.h"
#include "vtkVolumeRayCastCompositeFunction.h"
#include "vtkVolumeRayCastMapper.h"
#include "vtkVolume.h"
#include "vtkColorTransferFunction.h"


int main()
{
  vtkRenderer *renderer   = vtkRenderer::New();
  vtkRenderWindow *renWindow  = vtkRenderWindow::New();
  vtkRenderWindowInteractor *interactor = vtkRenderWindowInteractor::New();
  vtkStructuredPointsReader *reader = vtkStructuredPointsReader::New();
  vtkPiecewiseFunction *opacityTransferFunction = 
vtkPiecewiseFunction::New();
  vtkVolumeProperty *volumeProperty = vtkVolumeProperty::New();
  vtkVolumeRayCastCompositeFunction *compositeFunction = 
vtkVolumeRayCastCompositeFunction::New();
  vtkVolumeRayCastMapper *volumeMapper = vtkVolumeRayCastMapper::New();
  vtkVolume *volume = vtkVolume::New();
  vtkColorTransferFunction *color = vtkColorTransferFunction::New();

  reader->SetFileName("$VTK_DATA_ROOT/Data/ironProt.vtk");

  opacityTransferFunction->AddPoint(20, 0.0);
  opacityTransferFunction->AddPoint(255, 0.2);

  color->AddRGBPoint(64, 1.0, 0.0, 0.0);
  color->AddRGBPoint(128, 0.0, 0.0, 1.0);
  color->AddRGBPoint(192, 0.0, 1.0, 0.0);
  color->AddRGBPoint(255, 0.0, 0.2, 0.0);

   volumeProperty->SetColor(color);
   volumeProperty->SetScalarOpacity(opacityTransferFunction);

   volumeMapper->SetVolumeRayCastFunction(compositeFunction);
   volumeMapper->SetInput(reader->GetOutput());

   volume->SetMapper(volumeMapper);
   volume->SetProperty(volumeProperty);

   renderer->AddProp(volume);
   renWindow->Render();


   return 0;
}


When trying to compile it yields the following error message:  "no matching 
function for call to 
`vtkVolumeRayCastMapper::SetInput(vtkStructuredPoints*)'
/usr/local/include/vtk/vtkVolumeMapper.h:59: candidates are: virtual void
   vtkVolumeMapper::SetInput(vtkImageData*)"

I've double checked my code, and it's almost a carbon copy of the original 
written in tcl, so I suppose that in vtk 4.2.2 the function 
SetInput(vtkStructuredPoints*) in vtkVolumeRayCastMapper was dropped for 
SetInput(vtkImageData*).

Is this correct?
How can it be solved?

I need to apply ray casting to a structured grid, so I used a structured 
grid reader, but now  I don't know how to use vtkVolumeRayCasting mapper on 
it.

What shall I do?

Cheers.

Juan

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