[vtkusers] build 3D image

[Koy Fish]

Hi...

I need to visualize 2D bmp image into 3D. I have already build the visualization
pipeline for it, but the rendered image isn't look like 3D terrain image.
Is there something missing in my code below? 
Thanks,

Regards,

Koye


The code:
void main()
{
  vtkRenderer *aren    = vtkRenderer::New();
  vtkRenderWindow *renWin  = vtkRenderWindow::New();
    renWin->AddRenderer(aren);
  vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
    iren->SetRenderWindow(renWin);

  //load the image
  vtkBMPReader *reader = vtkBMPReader::New();
    reader->SetFileName("koy.bmp");

  vtkImageLuminance *luminance = vtkImageLuminance::New();
    luminance->SetInput(reader->GetOutput());

  vtkStructuredPointsGeometryFilter *geometry = vtkStructuredPointsGeometryFilter::New();
    geometry->SetInput(luminance->GetOutput());

  vtkWarpScalar * warp = vtkWarpScalar::New();
    warp->SetInput(geometry->GetOutput());
	warp->SetScaleFactor(0.1);

  vtkMergeFilter *merge = vtkMergeFilter::New();
	merge->SetGeometry(warp->GetOutput());
    merge->SetScalars(reader->GetOutput());

  vtkDataSetMapper *mapper = vtkDataSetMapper::New();
	mapper->SetInput(merge->GetOutput());
	//mapper->SetScalarRange(0 255);
	mapper->ImmediateModeRenderingOff();
  vtkActor *actor = vtkActor::New();
    actor->SetMapper(mapper);
    actor->GetProperty()->SetColor(0.8,1.0,0.9);

  aren->AddActor(actor);
  renWin->Render();
  iren->Start();
}

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