[vtkusers] fill vtkImageData in 3D

[kwayeke]

How can one fill out a 3D vtkImageData. I tried the following code in in my
program below but it did not work
double* pixel = static_cast<double*>(ImageData->GetScalarPointer(k,j,i));
                    pixel[i] = pix;
The program itself is below.
Many Thanks

----------------------------------------------------------------------------------------
vtkMatlabMexAdapter *matlabMexAdapter = vtkMatlabMexAdapter::New();   
vtkArray
*edata=matlabMexAdapter->mxArrayTovtkArray(const_cast<mxArray*>(prhs[0]));
vtkSmartPointer<vtkImageData> ImageData =
vtkSmartPointer<vtkImageData>::New();
	ImageData->SetDimensions(254,254,384);
    ImageData->SetOrigin(0.0,0.0,0.0);
    ImageData->SetSpacing(1.0,1.0,1.0);
    ImageData->SetScalarTypeToDouble();   
	ImageData->AllocateScalars();	 
	for(int i=0; i<z_dim-1; i++)
	   {
	 
	    for(int j=0;j<y_dim-1;j++)
		   { 
			   
			for(int k=0;k<x_dim-1;j++)
				{vtkVariant p=edata->GetVariantValue(k, j, i);
					double pix= p.ToDouble();					
					double* pixel =
static_cast<double*>(ImageData->GetScalarPointer(k,j,i));
                    pixel[i] = pix;

		        }
		    }
		
	  }
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