[vtkusers] Cannot translate an image using vtkImageReslice

[ahmed at mufradat.com]

Hello Everyone,

Can somebody please tell me what am I doing wrong in the following code?
using vtkImageReslice I can rotate or scale the image but whatever 
parameters I use to translate the image the output image stays identical 
to the input one. I was expecting the Mandelbrot to be shifted along the 
x,y but that never happens.


Best Regards,
Ahmed


FYI the following code was adapted from 
http://www.vtk.org/Wiki/VTK/Examples/Cxx/ImageData/ExtractVOI

#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkImageData.h>
#include <vtkImageMapper3D.h>
#include <vtkExtractVOI.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkImageActor.h>
#include <vtkImageCast.h>
#include <vtkImageMandelbrotSource.h>
#include <vtkImageReslice.h>
#include <vtkTransform.h>
int main(int, char *[])
{
   // Create an image
   vtkSmartPointer<vtkImageMandelbrotSource> source =
     vtkSmartPointer<vtkImageMandelbrotSource>::New();
   source->Update();

   int* inputDims = source->GetOutput()->GetDimensions();
   std::cout << "Dims: " << " x: " << inputDims[0]
                         << " y: " << inputDims[1]
                         << " z: " << inputDims[2] << std::endl;
   std::cout << "Number of points: " << 
source->GetOutput()->GetNumberOfPoints() << std::endl;
   std::cout << "Number of cells: " << 
source->GetOutput()->GetNumberOfCells() << std::endl;

	 vtkTransform *transform3= vtkTransform::New();
	  transform3->Translate(10, 10,0);
	   //transform3->Scale(0.05,0.05,0.05);
	   //transform3->RotateZ(90);

	 vtkImageReslice *thickReslice = vtkImageReslice::New();
	 thickReslice->SetInputConnection(source->GetOutputPort());
	 thickReslice->SetInterpolationModeToLinear();
	 thickReslice->SetOutputDimensionality(2);
	 thickReslice->SetBackgroundLevel(-1000);
	 thickReslice->SetOutputExtent(0,1000,0,1000,0,0);
	 thickReslice->SetResliceAxes(transform3->GetMatrix());
	 thickReslice->Update();

   vtkImageData* extracted = thickReslice->GetOutput();

   int* extractedDims = extracted->GetDimensions();
   std::cout << "Dims: " << " x: " << extractedDims[0]
                         << " y: " << extractedDims[1]
                         << " z: " << extractedDims[2] << std::endl;
   std::cout << "Number of points: " << extracted->GetNumberOfPoints() << 
std::endl;
   std::cout << "Number of cells: " << extracted->GetNumberOfCells() << 
std::endl;

   vtkSmartPointer<vtkImageCast> inputCastFilter =
     vtkSmartPointer<vtkImageCast>::New();
   inputCastFilter->SetInputConnection(source->GetOutputPort());
   inputCastFilter->SetOutputScalarTypeToUnsignedChar();
   inputCastFilter->Update();

   vtkSmartPointer<vtkImageCast> extractedCastFilter =
     vtkSmartPointer<vtkImageCast>::New();
#if VTK_MAJOR_VERSION <= 5
   extractedCastFilter->SetInputConnection(extracted->GetProducerPort());
#else
   extractedCastFilter->SetInputData(extracted);
#endif
   extractedCastFilter->SetOutputScalarTypeToUnsignedChar();
   extractedCastFilter->Update();

   // Create actors
   vtkSmartPointer<vtkImageActor> inputActor =
     vtkSmartPointer<vtkImageActor>::New();
   inputActor->GetMapper()->SetInputConnection(
     inputCastFilter->GetOutputPort());

   vtkSmartPointer<vtkImageActor> extractedActor =
     vtkSmartPointer<vtkImageActor>::New();
   extractedActor->GetMapper()->SetInputConnection(
     extractedCastFilter->GetOutputPort());

   // There will be one render window
   vtkSmartPointer<vtkRenderWindow> renderWindow =
     vtkSmartPointer<vtkRenderWindow>::New();
   renderWindow->SetSize(600, 300);

   // And one interactor
   vtkSmartPointer<vtkRenderWindowInteractor> interactor =
     vtkSmartPointer<vtkRenderWindowInteractor>::New();
   interactor->SetRenderWindow(renderWindow);

   // Define viewport ranges
   // (xmin, ymin, xmax, ymax)
   double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
   double rightViewport[4] = {0.5, 0.0, 1.0, 1.0};

   // Setup both renderers
   vtkSmartPointer<vtkRenderer> leftRenderer =
     vtkSmartPointer<vtkRenderer>::New();
   renderWindow->AddRenderer(leftRenderer);
   leftRenderer->SetViewport(leftViewport);
   leftRenderer->SetBackground(.6, .5, .4);

   vtkSmartPointer<vtkRenderer> rightRenderer =
     vtkSmartPointer<vtkRenderer>::New();
   renderWindow->AddRenderer(rightRenderer);
   rightRenderer->SetViewport(rightViewport);
   rightRenderer->SetBackground(.4, .5, .6);

   leftRenderer->AddActor(inputActor);
   rightRenderer->AddActor(extractedActor);

   leftRenderer->ResetCamera();

   rightRenderer->ResetCamera();

   renderWindow->Render();
   interactor->Start();


   return EXIT_SUCCESS;
}