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#include "vtkRenderWindow.h"
#include "vtkRenderer.h"
#include "vtkSphereSource.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkSmartPointer.h"
#include "vtkMultiBlockDataGroupFilter.h"
#include "vtkCompositePolyDataMapper2.h"
#include "vtkCompositeDataDisplayAttributes.h"
#include "vtkRegressionTestImage.h"
#include "vtkLookupTable.h"
#include "vtkActor.h"
#include "vtkPointData.h"
#include "vtkPolyData.h"
#include "vtkDataArray.h"
#include "vtkColorTransferFunction.h"
#include "vtkArrayCalculator.h"
int TestBlockOpacity(int argc, char* argv[])
{
// Standard rendering classes
vtkSmartPointer< vtkRenderer > renderer = vtkSmartPointer< vtkRenderer >::New();
vtkSmartPointer< vtkRenderWindow > renWin = vtkSmartPointer< vtkRenderWindow >::New();
renWin->SetMultiSamples(0);
renWin->SetAlphaBitPlanes(1);
renWin->AddRenderer(renderer);
vtkSmartPointer< vtkRenderWindowInteractor > iren =
vtkSmartPointer< vtkRenderWindowInteractor >::New();
iren->SetRenderWindow(renWin);
// We create a multiblock dataset with one block (a sphere) and set the
// block opacity to .75
vtkSmartPointer< vtkSphereSource > sphere = vtkSmartPointer< vtkSphereSource >::New();
sphere->SetRadius(0.5);
sphere->SetCenter(0.0,0.0,0.0);
sphere->SetThetaResolution(8);
sphere->SetPhiResolution(8);
sphere->Update();
// sphere->GetOutput()->GetPointData()->SetActiveScalars(name);
vtkSmartPointer< vtkArrayCalculator > calc = vtkSmartPointer< vtkArrayCalculator >::New();
calc->SetInputConnection(sphere->GetOutputPort());
calc->AddCoordinateScalarVariable("x",0);
calc->AddCoordinateScalarVariable("y",1);
calc->AddCoordinateScalarVariable("z",2);
calc->SetFunction("(x-y)*z");
calc->SetResultArrayName("result");
calc->Update();
double range[2];
calc->GetOutput()->GetPointData()->GetScalars()->GetRange(range);
vtkSmartPointer< vtkMultiBlockDataGroupFilter > groupDatasets =
vtkSmartPointer< vtkMultiBlockDataGroupFilter >::New();
groupDatasets->SetInputConnection(calc->GetOutputPort());
groupDatasets->Update();
vtkSmartPointer< vtkCompositePolyDataMapper2 > mapper =
vtkSmartPointer< vtkCompositePolyDataMapper2 >::New();
mapper->SetInputConnection(groupDatasets->GetOutputPort(0));
mapper->SetColorModeToMapScalars();
mapper->SetScalarModeToUsePointData();
mapper->ScalarVisibilityOn();
vtkSmartPointer< vtkCompositeDataDisplayAttributes > attrs =
vtkSmartPointer< vtkCompositeDataDisplayAttributes >::New();
mapper->SetCompositeDataDisplayAttributes(attrs);
mapper->SetBlockOpacity(1,0.5);
vtkSmartPointer< vtkColorTransferFunction > lut =
vtkSmartPointer< vtkColorTransferFunction >::New();
// This creates a blue to red lut.
lut->AddHSVPoint(range[0],0.667,1,1);
lut->AddHSVPoint(range[1],0,1,1);
lut->SetColorSpaceToDiverging();
lut->SetVectorModeToMagnitude();
mapper->SetLookupTable(lut);
mapper->SetInterpolateScalarsBeforeMapping(1);
vtkSmartPointer< vtkActor > actor = vtkSmartPointer< vtkActor >::New();
actor->SetMapper(mapper);
renderer->AddActor(actor);
renderer->SetUseDepthPeeling(1);
// reasonable depth peeling settings
// no more than 50 layers of transluceny
renderer->SetMaximumNumberOfPeels(50);
// stop when less than 2 in 1000 pixels changes
renderer->SetOcclusionRatio(0.002);
// Standard testing code.
renderer->SetBackground(0.5,0.5,0.5);
renWin->SetSize(300,300);
renWin->Render();
if(renderer->GetLastRenderingUsedDepthPeeling())
{
cout<<"depth peeling was used"<<endl;
}
else
{
cout<<"depth peeling was not used (alpha blending instead)"<<endl;
}
int retVal = vtkRegressionTestImage( renWin );
if ( retVal == vtkRegressionTester::DO_INTERACTOR)
{
iren->Start();
}
return !retVal;
}
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