ContoursFromPolyData
VTKExamples/Cxx/Filtering/ContoursFromPolyData
Description
This example uses vtkCutter to generate contours from a PolyData. A vtkPlane is set at the center of the PolyData and several contours are generated by specifying contour values that are distances to the center plane. The example works with a filename if provided. Otherwise is uses a vtkSphereSource.
Code
ContoursFromPolyData.cxx
#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkXMLPolyDataReader.h>
#include <vtkSphereSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkPlane.h>
#include <vtkCutter.h>
#include <vtkProperty.h>
#include <vtkActor.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkMath.h>
int main(int argc, char *argv[])
{
vtkSmartPointer<vtkPolyData> inputPolyData;
if(argc > 1)
{
vtkSmartPointer<vtkXMLPolyDataReader> reader =
vtkSmartPointer<vtkXMLPolyDataReader>::New();
reader->SetFileName(argv[1]);
reader->Update();
inputPolyData = reader->GetOutput();
}
else
{
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->SetThetaResolution(30);
sphereSource->SetPhiResolution(15);
sphereSource->Update();
inputPolyData = sphereSource->GetOutput();
}
vtkSmartPointer<vtkPolyDataMapper> inputMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
#if VTK_MAJOR_VERSION <= 5
inputMapper->SetInput(inputPolyData);
#else
inputMapper->SetInputData(inputPolyData);
#endif
// Create a plane to cut
vtkSmartPointer<vtkPlane> plane =
vtkSmartPointer<vtkPlane>::New();
plane->SetOrigin(inputPolyData->GetCenter());
plane->SetNormal(1,1,1);
double minBound[3];
minBound[0] = inputPolyData->GetBounds()[0];
minBound[1] = inputPolyData->GetBounds()[2];
minBound[2] = inputPolyData->GetBounds()[4];
double maxBound[3];
maxBound[0] = inputPolyData->GetBounds()[1];
maxBound[1] = inputPolyData->GetBounds()[3];
maxBound[2] = inputPolyData->GetBounds()[5];
double center[3];
center[0] = inputPolyData->GetCenter()[0];
center[1] = inputPolyData->GetCenter()[1];
center[2] = inputPolyData->GetCenter()[2];
double distanceMin = sqrt(vtkMath::Distance2BetweenPoints(minBound, center));
double distanceMax = sqrt(vtkMath::Distance2BetweenPoints(maxBound, center));
// Create cutter
vtkSmartPointer<vtkCutter> cutter =
vtkSmartPointer<vtkCutter>::New();
cutter->SetCutFunction(plane);
#if VTK_MAJOR_VERSION <= 5
cutter->SetInput(inputPolyData);
#else
cutter->SetInputData(inputPolyData);
#endif
cutter->GenerateValues(20, -distanceMin, distanceMax);
vtkSmartPointer<vtkPolyDataMapper> cutterMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
cutterMapper->SetInputConnection( cutter->GetOutputPort());
cutterMapper->ScalarVisibilityOff();
// Create plane actor
vtkSmartPointer<vtkActor> planeActor =
vtkSmartPointer<vtkActor>::New();
planeActor->GetProperty()->SetColor(1.0,1,0);
planeActor->GetProperty()->SetLineWidth(3);
planeActor->SetMapper(cutterMapper);
// Create input actor
vtkSmartPointer<vtkActor> inputActor =
vtkSmartPointer<vtkActor>::New();
inputActor->GetProperty()->SetColor(1.0, 0.8941, 0.7686); // bisque
inputActor->SetMapper(inputMapper);
// Create renderers and add actors of plane and cube
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
renderer->AddActor(planeActor); //display the rectangle resulting from the cut
renderer->AddActor(inputActor); //display the cube
//Add renderer to renderwindow and render
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
renderWindow->SetSize(600, 600);
vtkSmartPointer<vtkRenderWindowInteractor> interactor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(renderWindow);
renderer->SetBackground(.1, .2, .3);
renderWindow->Render();
interactor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ContoursFromPolyData)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ContoursFromPolyData MACOSX_BUNDLE ContoursFromPolyData.cxx)
target_link_libraries(ContoursFromPolyData ${VTK_LIBRARIES})
Download and Build ContoursFromPolyData
Click here to download ContoursFromPolyData and its CMakeLists.txt file. Once the tarball ContoursFromPolyData.tar has been downloaded and extracted,
cd ContoursFromPolyData/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:
./ContoursFromPolyData
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.