[vtkusers] the code always give erorr : Can't use the ray cast mapper without scalars!

[InfoSeekerr]

Dear All,

I wanted to apply traingular mish on sphere , but the  code always give
erorr : Can't use the ray cast mapper without scalars! , how to fix this
error please,I used the following code (written in c#) :
              
 // volume property
            int shade = 0,compos =  0,  //Classify First or Interpolate
First 
 	        interp = 0;
 
           // renderer
           vtkRenderer ren1= new vtkRenderer();
           ren1.SetBackground( 1.0, 1.0, 1.0 );
   
           // render window
           vtkRenderWindow renWin = new vtkRenderWindow();
           renWin.AddRenderer( ren1 );
           renWin.SetSize( 800, 600 );
 
           // interactor
           vtkRenderWindowInteractor iren1 = new
vtkRenderWindowInteractor();
           iren1.SetRenderWindow(renWin);
 
           // set up the input file for unstructured grid reader
                       //1.Create a volume data
                    // create sphere geometry 
                    vtkSphereSource sphere = new vtkSphereSource();
                    sphere.SetRadius(1.0);
                    sphere.SetThetaResolution(18);
                    sphere.SetPhiResolution(18);
                    //2.Apply the tetrahedral mish
                    vtkPolyData vp = new vtkPolyData();
           
            vtkDelaunay3D unstructuredReader = new vtkDelaunay3D();
            unstructuredReader.SetInput(sphere.GetOutput());

 
   // set up opacity transfer function
   vtkPiecewiseFunction opacityTransferFunction = new 
vtkPiecewiseFunction();
   opacityTransferFunction.AddPoint(0,   0.02);
   opacityTransferFunction.AddPoint(4095.0, 1.0);
 
   // set up color transfer function
   vtkColorTransferFunction colorTransferFunction = new
vtkColorTransferFunction();
   colorTransferFunction.AddRGBPoint( 0.0, 0.1, 0.1, 0.1);
   colorTransferFunction.AddRGBPoint( 4095.0, 1.0, 0.0, 1.0);	
 
   // set up volume property
   vtkVolumeProperty volumeProperty = new vtkVolumeProperty();
   volumeProperty.SetColor(colorTransferFunction);
   volumeProperty.SetScalarOpacity(opacityTransferFunction);
   volumeProperty.SetInterpolationType(interp);
   volumeProperty.SetShade(shade);
 
   // composite function for strucured grid renderer
   vtkVolumeRayCastCompositeFunction compositeFunction = new
vtkVolumeRayCastCompositeFunction();
   compositeFunction.SetCompositeMethod(compos);
 
   //unstructuredGridRendering
  vtkUnstructuredGridVolumeRayCastMapper  volumeUnstructedMapper = new 
vtkUnstructuredGridVolumeRayCastMapper();
    //          vtkVolumeRayCastMapper volumeUnstructedMapper = new
vtk.vtkVolumeRayCastMapper();
            //volumeUnstructedMapper.set  (compositeFunction);
           
volumeUnstructedMapper.SetInputConnection(unstructuredReader.GetOutputPort());

    
   vtkVolume volume = new vtkVolume();
 
   volume.SetMapper(volumeUnstructedMapper);
   
   volume.SetProperty(volumeProperty);
 
   // add volume to renderer
   ren1.AddVolume(volume);
 
   renWin.Render();
 
   iren1.Start();
   
   ren1.Dispose();
   renWin.Dispose();
   iren1.Dispose();
   opacityTransferFunction.Dispose();
   colorTransferFunction.Dispose();
   volumeProperty.Dispose();
   compositeFunction.Dispose();
    // unstructured grid case
   volumeUnstructedMapper.Dispose();
   unstructuredReader.Dispose();
   volume.Dispose();
       ///////////////////////////////////////////////
             


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