DownsamplePointCloud
VTKExamples/Cxx/PolyData/DownsamplePointCloud
Description
This example downsamples a point cloud by specifying the minimum distance two points can be from each other. The filter will delete points so that this criterion is met.
Code
DownsamplePointCloud.cxx
#include <vtkSmartPointer.h>
#include <vtkPointSource.h>
#include <vtkPolyData.h>
#include <vtkCleanPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
int main(int, char *[])
{
vtkSmartPointer<vtkPointSource> pointSource =
vtkSmartPointer<vtkPointSource>::New();
pointSource->SetNumberOfPoints(1000);
pointSource->SetRadius(1.0);
pointSource->Update();
vtkSmartPointer<vtkCleanPolyData> cleanPolyData =
vtkSmartPointer<vtkCleanPolyData>::New();
cleanPolyData->SetInputConnection(pointSource->GetOutputPort());
cleanPolyData->SetTolerance(0.1);
cleanPolyData->Update();
vtkSmartPointer<vtkPolyDataMapper> inputMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
inputMapper->SetInputConnection(pointSource->GetOutputPort());
vtkSmartPointer<vtkActor> inputActor =
vtkSmartPointer<vtkActor>::New();
inputActor->SetMapper(inputMapper);
vtkSmartPointer<vtkPolyDataMapper> cleanedMapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
cleanedMapper->SetInputConnection(cleanPolyData->GetOutputPort());
vtkSmartPointer<vtkActor> cleanedActor =
vtkSmartPointer<vtkActor>::New();
cleanedActor->SetMapper(cleanedMapper);
// There will be one render window
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->SetSize(600, 300);
// And one interactor
vtkSmartPointer<vtkRenderWindowInteractor> interactor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(renderWindow);
// Define viewport ranges
// (xmin, ymin, xmax, ymax)
double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
double rightViewport[4] = {0.5, 0.0, 1.0, 1.0};
// Setup both renderers
vtkSmartPointer<vtkRenderer> leftRenderer =
vtkSmartPointer<vtkRenderer>::New();
renderWindow->AddRenderer(leftRenderer);
leftRenderer->SetViewport(leftViewport);
leftRenderer->SetBackground(.6, .5, .4);
vtkSmartPointer<vtkRenderer> rightRenderer =
vtkSmartPointer<vtkRenderer>::New();
renderWindow->AddRenderer(rightRenderer);
rightRenderer->SetViewport(rightViewport);
rightRenderer->SetBackground(.4, .5, .6);
leftRenderer->AddActor(inputActor);
rightRenderer->AddActor(cleanedActor);
leftRenderer->ResetCamera();
rightRenderer->ResetCamera();
renderWindow->Render();
interactor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(DownsamplePointCloud)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(DownsamplePointCloud MACOSX_BUNDLE DownsamplePointCloud.cxx)
target_link_libraries(DownsamplePointCloud ${VTK_LIBRARIES})
Download and Build DownsamplePointCloud
Click here to download DownsamplePointCloud and its CMakeLists.txt file. Once the tarball DownsamplePointCloud.tar has been downloaded and extracted,
cd DownsamplePointCloud/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:
./DownsamplePointCloud
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.