MaskPointsFilter
VTKExamples/Cxx/Points/MaskPointsFilter
Description
'''NOTE: The classes used in this example require vtk 7.1 or later.'''
Code
MaskPointsFilter.cxx
#include <vtkSmartPointer.h>
#include <vtkMaskPointsFilter.h>
#include <vtkBoundedPointSource.h>
#include <vtkImageData.h>
#include <vtkCone.h>
#include <vtkSampleImplicitFunctionFilter.h>
#include <vtkImageThreshold.h>
#include <vtkBoundedPointSource.h>
#include <vtkMetaImageReader.h>
#include <vtkSphereSource.h>
#include <vtkGlyph3D.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkCamera.h>
static vtkSmartPointer<vtkImageData> CreatePoints();
int main (int argc, char *argv[])
{
vtkSmartPointer<vtkImageData> imageMask;
if (argc < 2)
{
imageMask = CreatePoints();
}
else
{
int upper = 1100;
if (argc > 2)
{
upper = atoi(argv[2]);
}
// Read the volume data
vtkSmartPointer<vtkMetaImageReader> reader =
vtkSmartPointer<vtkMetaImageReader>::New();
reader->SetFileName (argv[1]);
reader->Update();
vtkSmartPointer<vtkImageThreshold> threshold =
vtkSmartPointer<vtkImageThreshold>::New();
threshold->SetInputConnection(reader->GetOutputPort());
threshold->ThresholdByUpper(upper);
threshold->SetOutputScalarTypeToUnsignedChar();
threshold->ReplaceInOn();
threshold->SetInValue(255);
threshold->SetOutValue(0);
threshold->ReplaceOutOn();
threshold->Update();
imageMask = vtkImageData::SafeDownCast(threshold->GetOutput());
}
vtkSmartPointer<vtkBoundedPointSource> pointSource =
vtkSmartPointer<vtkBoundedPointSource>::New();
pointSource->SetNumberOfPoints(100000);
pointSource->SetBounds(imageMask->GetBounds());
vtkSmartPointer<vtkMaskPointsFilter> maskPoints =
vtkSmartPointer<vtkMaskPointsFilter>::New();
maskPoints->SetInputConnection(pointSource->GetOutputPort());
maskPoints->SetMaskData(imageMask);
double radius = imageMask->GetSpacing()[0] * 4.0;
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->SetRadius(radius);
vtkSmartPointer<vtkGlyph3D> glyph =
vtkSmartPointer<vtkGlyph3D>::New();
glyph->SetInputConnection(maskPoints->GetOutputPort());
glyph->SetSourceConnection(sphereSource->GetOutputPort());
glyph->ScalingOff();
glyph->Update();
vtkSmartPointer<vtkPolyDataMapper> glyphMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
glyphMapper->SetInputConnection(glyph->GetOutputPort());
glyphMapper->ScalarVisibilityOff();
vtkSmartPointer<vtkActor> glyphActor =
vtkSmartPointer<vtkActor>::New();
glyphActor->SetMapper(glyphMapper);
glyphActor->GetProperty()->SetColor(0.8900, 0.8100, 0.3400);
// Create graphics stuff
//
vtkSmartPointer<vtkRenderer> ren1 =
vtkSmartPointer<vtkRenderer>::New();
ren1->SetBackground(.3, .4, .6);
vtkSmartPointer<vtkRenderWindow> renWin =
vtkSmartPointer<vtkRenderWindow>::New();
renWin->AddRenderer(ren1);
renWin->SetSize(512,512);
vtkSmartPointer<vtkRenderWindowInteractor> iren =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
iren->SetRenderWindow(renWin);
// Add the actors to the renderer, set the background and size
//
ren1->AddActor(glyphActor);
// Generate an interesting view
//
ren1->GetActiveCamera()->SetPosition (1, 0, 0);
ren1->GetActiveCamera()->SetFocalPoint (0, 1, 0);
ren1->GetActiveCamera()->SetViewUp (0, 0, -1);
ren1->GetActiveCamera()->Azimuth(30);
ren1->GetActiveCamera()->Elevation(30);
ren1->ResetCamera();
ren1->GetActiveCamera()->Dolly(1.0);
ren1->ResetCameraClippingRange();
iren->Initialize();
iren->Start();
return EXIT_SUCCESS;
}
static vtkSmartPointer<vtkImageData> CreatePoints()
{
vtkSmartPointer<vtkImageData> imageMask =
vtkSmartPointer<vtkImageData>::New();
vtkSmartPointer<vtkImageData> image =
vtkSmartPointer<vtkImageData>::New();
image->SetDimensions(256,256,256);
image->AllocateScalars(VTK_DOUBLE,1);
image->SetSpacing(5.0/255.0, 5.0/255.0, 5.0/255.0);
image->SetOrigin(-2.5, -2.5, -2.5);
vtkSmartPointer<vtkCone> implicitFunction =
vtkSmartPointer<vtkCone>::New();
vtkSmartPointer<vtkSampleImplicitFunctionFilter> sample =
vtkSmartPointer<vtkSampleImplicitFunctionFilter>::New();
sample->SetImplicitFunction(implicitFunction);
sample->SetInputData(image);
vtkSmartPointer<vtkImageThreshold> threshold =
vtkSmartPointer<vtkImageThreshold>::New();
threshold->SetInputConnection(sample->GetOutputPort());
threshold->ThresholdByLower(.5);
threshold->SetOutputScalarTypeToUnsignedChar();
threshold->ReplaceInOn();
threshold->SetInValue(255);
threshold->SetOutValue(0);
threshold->ReplaceOutOn();
threshold->Update();
imageMask = vtkImageData::SafeDownCast(threshold->GetOutput());
return imageMask;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(MaskPointsFilter)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(MaskPointsFilter MACOSX_BUNDLE MaskPointsFilter.cxx)
target_link_libraries(MaskPointsFilter ${VTK_LIBRARIES})
Download and Build MaskPointsFilter
Click here to download MaskPointsFilter and its CMakeLists.txt file. Once the tarball MaskPointsFilter.tar has been downloaded and extracted,
cd MaskPointsFilter/build
If VTK is installed:
cmake ..
If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:
cmake -DVTK_DIR:PATH=/home/me/vtk_build ..
Build the project:
make
and run it:
./MaskPointsFilter
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.