CombinePolyData
VTKExamples/Cxx/Filtering/CombinePolyData
Description
This example reads two .vtp files (or produces them if not specified as command line arguments), combines them, and displays the result to the screen.
Code
CombinePolyData.cxx
#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkPolyData.h>
#include <vtkSphereSource.h>
#include <vtkConeSource.h>
#include <vtkXMLPolyDataReader.h>
#include <vtkCleanPolyData.h>
#include <vtkAppendPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
int main(int argc, char *argv[])
{
vtkSmartPointer<vtkPolyData> input1 =
vtkSmartPointer<vtkPolyData>::New();
vtkSmartPointer<vtkPolyData> input2 =
vtkSmartPointer<vtkPolyData>::New();
if(argc == 1) //command line arguments not specified
{
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->SetCenter(5,0,0);
sphereSource->Update();
input1->ShallowCopy(sphereSource->GetOutput());
vtkSmartPointer<vtkConeSource> coneSource =
vtkSmartPointer<vtkConeSource>::New();
coneSource->Update();
input2->ShallowCopy(coneSource->GetOutput());
}
else
{
if(argc != 3)
{
std::cout << "argc = " << argc << std::endl;
std::cout << "Required arguments: File1 File2" << std::endl;
return EXIT_FAILURE;
}
std::string inputFilename1 = argv[1];
std::string inputFilename2 = argv[2];
vtkSmartPointer<vtkXMLPolyDataReader> reader1 =
vtkSmartPointer<vtkXMLPolyDataReader>::New();
reader1->SetFileName(inputFilename1.c_str());
reader1->Update();
input1->ShallowCopy(reader1->GetOutput());
vtkSmartPointer<vtkXMLPolyDataReader> reader2 =
vtkSmartPointer<vtkXMLPolyDataReader>::New();
reader2->SetFileName(inputFilename2.c_str());
reader2->Update();
input2->ShallowCopy(reader2->GetOutput());
}
//Append the two meshes
vtkSmartPointer<vtkAppendPolyData> appendFilter =
vtkSmartPointer<vtkAppendPolyData>::New();
#if VTK_MAJOR_VERSION <= 5
appendFilter->AddInputConnection(input1->GetProducerPort());
appendFilter->AddInputConnection(input2->GetProducerPort());
#else
appendFilter->AddInputData(input1);
appendFilter->AddInputData(input2);
#endif
appendFilter->Update();
// Remove any duplicate points.
vtkSmartPointer<vtkCleanPolyData> cleanFilter =
vtkSmartPointer<vtkCleanPolyData>::New();
cleanFilter->SetInputConnection(appendFilter->GetOutputPort());
cleanFilter->Update();
//Create a mapper and actor
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(cleanFilter->GetOutputPort());
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
//Create a renderer, render window, and interactor
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
//Add the actors to the scene
renderer->AddActor(actor);
renderer->SetBackground(.3, .2, .1); // Background color dark red
//Render and interact
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(CombinePolyData)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(CombinePolyData MACOSX_BUNDLE CombinePolyData.cxx)
target_link_libraries(CombinePolyData ${VTK_LIBRARIES})
Download and Build CombinePolyData
Click here to download CombinePolyData and its CMakeLists.txt file. Once the tarball CombinePolyData.tar has been downloaded and extracted,
cd CombinePolyData/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:
./CombinePolyData
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.