task1.cxx

a very goog book

/*=========================================================================

  Program:   Visualization Toolkit
  Module:    $RCSfile: task1.cxx,v $
  Language:  C++
  Date:      $Date: 2002/09/30 20:37:43 $
  Version:   $Revision: 1.7 $

  Copyright (c) 1993-2002 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.

=========================================================================*/
#include "TaskParallelism.h"

#include "vtkImageData.h"
#include "vtkPolyData.h"
#include "vtkPolyDataMapper.h"

// Task 1 for TaskParallelism.
// See TaskParallelism.cxx for more information.
vtkPolyDataMapper* task1(vtkRenderWindow* renWin, double data,
                         vtkCamera* cam)
{
  double extent = data;
  int iextent = static_cast<int>(data);
  // The pipeline

  // Synthetic image source.
  vtkRTAnalyticSource* source1 = vtkRTAnalyticSource::New();
  source1->SetWholeExtent (-1*iextent, iextent, -1*iextent, iextent, 
                           -1*iextent, iextent );
  source1->SetCenter(0, 0, 0);
  source1->SetStandardDeviation( 0.5 );
  source1->SetMaximum( 255.0 );
  source1->SetXFreq( 60 );
  source1->SetXMag( 10 );
  source1->SetYFreq( 30 );
  source1->SetYMag( 18 );
  source1->SetZFreq( 40 );
  source1->SetZMag( 5 );
  source1->GetOutput()->SetSpacing(2.0/extent,2.0/extent,2.0/extent);

  // Iso-surfacing.
  vtkContourFilter* contour = vtkContourFilter::New();
  contour->SetInput(source1->GetOutput());
  contour->SetNumberOfContours(1);
  contour->SetValue(0, 220);

  // Magnitude of the gradient vector.
  vtkImageGradientMagnitude* magn = vtkImageGradientMagnitude::New();
  magn->SetDimensionality(3);
  magn->SetInput(source1->GetOutput());

  // Probe magnitude with iso-surface.
  vtkProbeFilter* probe = vtkProbeFilter::New();
  probe->SetInput(contour->GetOutput());
  probe->SetSource(magn->GetOutput());
  probe->SpatialMatchOn();

  // Rendering objects.
  vtkPolyDataMapper* mapper = vtkPolyDataMapper::New();
  mapper->SetInput(probe->GetPolyDataOutput());
  mapper->SetScalarRange(50, 180);
  mapper->ImmediateModeRenderingOn();

  vtkActor* actor = vtkActor::New();
  actor->SetMapper(mapper);

  vtkRenderer* ren = vtkRenderer::New();
  renWin->AddRenderer(ren);

  ren->AddActor(actor);
  ren->SetActiveCamera( cam );

  // Cleanup
  source1->Delete();
  contour->Delete();
  magn->Delete();
  probe->Delete();
  actor->Delete();
  ren->Delete();

  return mapper;

}