CombinePolyData
vtk-examples/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.
Other languages
See (Python)
Question
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Code¶
CombinePolyData.cxx
#include <vtkActor.h>
#include <vtkAppendPolyData.h>
#include <vtkCamera.h>
#include <vtkCleanPolyData.h>
#include <vtkConeSource.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSphereSource.h>
#include <vtkXMLPolyDataReader.h>
int main(int argc, char* argv[])
{
vtkNew<vtkNamedColors> colors;
vtkNew<vtkPolyData> input1;
vtkNew<vtkPolyData> input2;
if (argc == 1) // command line arguments not specified
{
vtkNew<vtkSphereSource> sphereSource;
sphereSource->SetCenter(5, 0, 0);
sphereSource->Update();
input1->ShallowCopy(sphereSource->GetOutput());
vtkNew<vtkConeSource> coneSource;
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];
vtkNew<vtkXMLPolyDataReader> reader1;
reader1->SetFileName(inputFilename1.c_str());
reader1->Update();
input1->ShallowCopy(reader1->GetOutput());
vtkNew<vtkXMLPolyDataReader> reader2;
reader2->SetFileName(inputFilename2.c_str());
reader2->Update();
input2->ShallowCopy(reader2->GetOutput());
}
// Append the two meshes
vtkNew<vtkAppendPolyData> appendFilter;
appendFilter->AddInputData(input1);
appendFilter->AddInputData(input2);
// Remove any duplicate points.
vtkNew<vtkCleanPolyData> cleanFilter;
cleanFilter->SetInputConnection(appendFilter->GetOutputPort());
cleanFilter->Update();
// Create a mapper and actor
vtkNew<vtkPolyDataMapper> mapper;
mapper->SetInputConnection(cleanFilter->GetOutputPort());
vtkNew<vtkActor> actor;
actor->SetMapper(mapper);
// Create a renderer, render window, and interactor
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->AddRenderer(renderer);
vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
renderWindowInteractor->SetRenderWindow(renderWindow);
// Add the actors to the scene
renderer->AddActor(actor);
// Render and interact
renderWindowInteractor->Initialize();
renderWindow->Render();
renderer->SetBackground(colors->GetColor3d("deep_ochre").GetData());
renderer->GetActiveCamera()->Zoom(0.9);
renderWindow->SetWindowName("CombinePolyData");
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
project(CombinePolyData)
find_package(VTK COMPONENTS
vtkCommonColor
vtkCommonCore
vtkCommonDataModel
vtkFiltersCore
vtkFiltersSources
vtkIOXML
vtkInteractionStyle
vtkRenderingContextOpenGL2
vtkRenderingCore
vtkRenderingFreeType
vtkRenderingGL2PSOpenGL2
vtkRenderingOpenGL2
QUIET
)
if (NOT VTK_FOUND)
message("Skipping CombinePolyData: ${VTK_NOT_FOUND_MESSAGE}")
return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
# old system
include(${VTK_USE_FILE})
add_executable(CombinePolyData MACOSX_BUNDLE CombinePolyData.cxx )
target_link_libraries(CombinePolyData PRIVATE ${VTK_LIBRARIES})
else ()
# include all components
add_executable(CombinePolyData MACOSX_BUNDLE CombinePolyData.cxx )
target_link_libraries(CombinePolyData PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS CombinePolyData
MODULES ${VTK_LIBRARIES}
)
endif ()
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
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.