text: /*=========================================================================
  
    Program:   Visualization Toolkit
    Module:    TestSobelGradientMagnitudePass.cxx
  
    Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
    All rights reserved.
    See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
  
       This software is distributed WITHOUT ANY WARRANTY; without even
       the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE.  See the above copyright notice for more information.
  
  =========================================================================*/
  // This test covers the Sobel edge detection post-processing render pass.
  // It renders an opaque actor  The mapper uses color
  // interpolation (poor quality).
  //
  // The command line arguments are:
  // -I        => run in interactive mode; unless this is used, the program will
  //              not allow interaction and exit
  
  #include "vtkTestUtilities.h"
  #include "vtkRegressionTestImage.h"
  
  #include "vtkRenderWindowInteractor.h"
  #include "vtkRenderWindow.h"
  #include "vtkOpenGLRenderer.h"
  #include "vtkActor.h"
  
  #include "vtkImageSinusoidSource.h"
  #include "vtkImageData.h"
  #include "vtkImageDataGeometryFilter.h"
  #include "vtkDataSetSurfaceFilter.h"
  #include "vtkPolyDataMapper.h"
  #include "vtkLookupTable.h"
  #include "vtkCamera.h"
  
  #include "vtkCameraPass.h"
  #include "vtkLightsPass.h"
  #include "vtkSequencePass.h"
  #include "vtkOpaquePass.h"
  //#include "vtkDepthPeelingPass.h"
  #include "vtkTranslucentPass.h"
  #include "vtkVolumetricPass.h"
  #include "vtkOverlayPass.h"
  #include "vtkRenderPassCollection.h"
  #include "vtkSobelGradientMagnitudePass.h"
  #include "vtkConeSource.h"
  
  int TestSobelGradientMagnitudePass(int argc, char* argv[])
  {
    vtkRenderWindowInteractor *iren=vtkRenderWindowInteractor::New();
    vtkRenderWindow *renWin = vtkRenderWindow::New();
    renWin->SetMultiSamples(0);
  
    renWin->SetAlphaBitPlanes(1);
    iren->SetRenderWindow(renWin);
    renWin->Delete();
  
    vtkRenderer *renderer = vtkRenderer::New();
    renWin->AddRenderer(renderer);
    renderer->Delete();
  
    vtkOpenGLRenderer *glrenderer = vtkOpenGLRenderer::SafeDownCast(renderer);
  
    vtkCameraPass *cameraP=vtkCameraPass::New();
  
    vtkSequencePass *seq=vtkSequencePass::New();
    vtkOpaquePass *opaque=vtkOpaquePass::New();
  //  vtkDepthPeelingPass *peeling=vtkDepthPeelingPass::New();
  //  peeling->SetMaximumNumberOfPeels(200);
  //  peeling->SetOcclusionRatio(0.1);
  
    vtkTranslucentPass *translucent=vtkTranslucentPass::New();
  //  peeling->SetTranslucentPass(translucent);
  
    vtkVolumetricPass *volume=vtkVolumetricPass::New();
    vtkOverlayPass *overlay=vtkOverlayPass::New();
  
    vtkLightsPass *lights=vtkLightsPass::New();
  
    vtkRenderPassCollection *passes=vtkRenderPassCollection::New();
    passes->AddItem(lights);
    passes->AddItem(opaque);
  
  //  passes->AddItem(peeling);
    passes->AddItem(translucent);
  
    passes->AddItem(volume);
    passes->AddItem(overlay);
    seq->SetPasses(passes);
    cameraP->SetDelegatePass(seq);
  
    vtkSobelGradientMagnitudePass *sobelP=vtkSobelGradientMagnitudePass::New();
    sobelP->SetDelegatePass(cameraP);
  
    glrenderer->SetPass(sobelP);
  
  //  renderer->SetPass(cameraP);
  
    opaque->Delete();
  //  peeling->Delete();
    translucent->Delete();
    volume->Delete();
    overlay->Delete();
    seq->Delete();
    passes->Delete();
    cameraP->Delete();
    sobelP->Delete();
    lights->Delete();
  
    vtkImageSinusoidSource *imageSource=vtkImageSinusoidSource::New();
    imageSource->SetWholeExtent(0,9,0,9,0,9);
    imageSource->SetPeriod(5);
    imageSource->Update();
  
    vtkImageData *image=imageSource->GetOutput();
    double range[2];
    image->GetScalarRange(range);
  
    vtkDataSetSurfaceFilter *surface=vtkDataSetSurfaceFilter::New();
  
    surface->SetInputConnection(imageSource->GetOutputPort());
    imageSource->Delete();
  
    vtkPolyDataMapper *mapper=vtkPolyDataMapper::New();
    mapper->SetInputConnection(surface->GetOutputPort());
    surface->Delete();
  
    vtkLookupTable *lut=vtkLookupTable::New();
    lut->SetTableRange(range);
    lut->SetAlphaRange(0.5,0.5);
    lut->SetHueRange(0.2,0.7);
    lut->SetNumberOfTableValues(256);
    lut->Build();
  
    mapper->SetScalarVisibility(1);
    mapper->SetLookupTable(lut);
    lut->Delete();
  
    vtkActor *actor=vtkActor::New();
    renderer->AddActor(actor);
    actor->Delete();
    actor->SetMapper(mapper);
    mapper->Delete();
    actor->SetVisibility(0);
  
    vtkConeSource *cone=vtkConeSource::New();
    vtkPolyDataMapper *coneMapper=vtkPolyDataMapper::New();
    coneMapper->SetInputConnection(cone->GetOutputPort());
    coneMapper->SetImmediateModeRendering(1);
    cone->Delete();
    vtkActor *coneActor=vtkActor::New();
    coneActor->SetMapper(coneMapper);
    coneActor->SetVisibility(1);
    coneMapper->Delete();
    renderer->AddActor(coneActor);
    coneActor->Delete();
  
    renderer->SetBackground(0.1,0.3,0.0);
    renWin->SetSize(400,400);
  
    renWin->Render();
    vtkCamera *camera=renderer->GetActiveCamera();
    camera->Azimuth(-40.0);
    camera->Elevation(20.0);
    renWin->Render();
  
    int retVal = vtkRegressionTestImage( renWin );
    if ( retVal == vtkRegressionTester::DO_INTERACTOR)
    {
      iren->Start();
    }
    iren->Delete();
  
    return !retVal;
  }
  