AppendFilter
VTKExamples/Cxx/Filtering/AppendFilter
Description
This example loads points into a polydata and an unstructured grid then combines them.
The example should be extended to show cells being combined as well.
Code
AppendFilter.cxx
#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkActor.h>
#include <vtkAppendFilter.h>
#include <vtkDataSetMapper.h>
#include <vtkPointSource.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkUnstructuredGrid.h>
int main(int, char *[])
{
// Create 5 points (vtkPolyData)
vtkSmartPointer<vtkPointSource> pointSource =
vtkSmartPointer<vtkPointSource>::New();
pointSource->SetNumberOfPoints(5);
pointSource->Update();
vtkSmartPointer<vtkPolyData> polydata = pointSource->GetOutput();
std::cout << "There are " << polydata->GetNumberOfPoints()
<< " points in the polydata." << std::endl;
// Create 2 points in a vtkUnstructuredGrid
vtkSmartPointer<vtkPoints> points =
vtkSmartPointer<vtkPoints>::New();
points->InsertNextPoint(0,0,0);
points->InsertNextPoint(0,0,1);
vtkSmartPointer<vtkUnstructuredGrid> ug =
vtkSmartPointer<vtkUnstructuredGrid>::New();
ug->SetPoints(points);
std::cout << "There are " << ug->GetNumberOfPoints()
<< " points in the unstructured grid." << std::endl;
// Combine the two data sets
vtkSmartPointer<vtkAppendFilter> appendFilter =
vtkSmartPointer<vtkAppendFilter>::New();
#if VTK_MAJOR_VERSION <= 5
appendFilter->AddInput(polydata);
appendFilter->AddInput(ug);
#else
appendFilter->AddInputData(polydata);
appendFilter->AddInputData(ug);
#endif
appendFilter->Update();
vtkSmartPointer<vtkUnstructuredGrid> combined =
appendFilter->GetOutput();
std::cout << "There are " << combined->GetNumberOfPoints()
<< " points combined." << std::endl;
// Create a mapper and actor
vtkSmartPointer<vtkDataSetMapper> mapper =
vtkSmartPointer<vtkDataSetMapper>::New();
mapper->SetInputConnection(appendFilter->GetOutputPort());
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
actor->GetProperty()->SetPointSize(5);
// 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 actor to the scene
renderer->AddActor(actor);
renderer->SetBackground(.2, .3, .4);
// Render and interact
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(AppendFilter)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(AppendFilter MACOSX_BUNDLE AppendFilter.cxx)
target_link_libraries(AppendFilter ${VTK_LIBRARIES})
Download and Build AppendFilter
Click here to download AppendFilter and its CMakeLists.txt file. Once the tarball AppendFilter.tar has been downloaded and extracted,
cd AppendFilter/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:
./AppendFilter
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.