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/*=========================================================================
Program: Visualization Toolkit
Module: TestMinIntensityRendering.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.
=========================================================================*/
#include "vtkCamera.h"
#include "vtkFiniteDifferenceGradientEstimator.h"
#include "vtkImageClip.h"
#include "vtkPiecewiseFunction.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkStructuredPoints.h"
#include "vtkStructuredPointsReader.h"
#include "vtkVolume.h"
#include "vtkVolumeProperty.h"
#include "vtkFixedPointVolumeRayCastMapper.h"
#include "vtkColorTransferFunction.h"
#include "vtkTestUtilities.h"
#include "vtkRegressionTestImage.h"
#include "vtkDebugLeaks.h"
int TestMinIntensityRendering( int argc, char *argv[] )
{
// Create the renderers, render window, and interactor
vtkRenderWindow *renWin = vtkRenderWindow::New();
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
iren->SetRenderWindow(renWin);
vtkRenderer *ren = vtkRenderer::New();
renWin->AddRenderer(ren);
// Read the data from a vtk file
char* fname = vtkTestUtilities::ExpandDataFileName(argc, argv, "Data/ironProt.vtk");
vtkStructuredPointsReader *reader = vtkStructuredPointsReader::New();
reader->SetFileName(fname);
reader->Update();
delete [] fname;
// Create a transfer function mapping scalar value to opacity
vtkPiecewiseFunction *oTFun = vtkPiecewiseFunction::New();
oTFun->AddSegment(0, 1.0, 256, 0.1);
vtkColorTransferFunction *cTFun = vtkColorTransferFunction::New();
cTFun->AddRGBPoint( 0, 1.0, 1.0, 1.0 );
cTFun->AddRGBPoint( 255, 1.0, 1.0, 1.0 );
// Need to crop to actually see minimum intensity
vtkImageClip *clip = vtkImageClip::New();
clip->SetInputConnection( reader->GetOutputPort() );
clip->SetOutputWholeExtent(0,66,0,66,30,37);
clip->ClipDataOn();
vtkVolumeProperty *property = vtkVolumeProperty::New();
property->SetScalarOpacity(oTFun);
property->SetColor(cTFun);
property->SetInterpolationTypeToLinear();
vtkFixedPointVolumeRayCastMapper *mapper = vtkFixedPointVolumeRayCastMapper::New();
mapper->SetBlendModeToMinimumIntensity();
mapper->SetInputConnection( clip->GetOutputPort() );
vtkVolume *volume = vtkVolume::New();
volume->SetMapper(mapper);
volume->SetProperty(property);
ren->AddViewProp(volume);
renWin->Render();
int retVal = vtkRegressionTestImageThreshold( renWin, 70 );
if ( retVal == vtkRegressionTester::DO_INTERACTOR)
{
iren->Start();
}
volume->Delete();
mapper->Delete();
property->Delete();
clip->Delete();
cTFun->Delete();
oTFun->Delete();
reader->Delete();
renWin->Delete();
iren->Delete();
ren->Delete();
return !retVal;
}
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