QuantizePolyDataPoints
VTKExamples/Cxx/PolyData/QuantizePolyDataPoints
Description¶
This example demonstrates how to "snap" points onto a discrete grid. This example rounds the coordinates of each point the the nearest .1
Code¶
QuantizePolyDataPoints.cxx
#include <vtkSmartPointer.h> #include <vtkQuantizePolyDataPoints.h> #include <vtkPoints.h> #include <vtkPolyData.h> #include <vtkPointSource.h> #include <vtkPolyDataMapper.h> #include <vtkProperty.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkXMLPolyDataReader.h> int main(int, char *[]) { vtkSmartPointer<vtkPointSource> pointSource = vtkSmartPointer<vtkPointSource>::New(); pointSource->SetNumberOfPoints(10); pointSource->Update(); std::cout << "There are " << pointSource->GetNumberOfPoints() << " points." << std::endl; vtkSmartPointer<vtkQuantizePolyDataPoints> quantizeFilter = vtkSmartPointer<vtkQuantizePolyDataPoints>::New(); quantizeFilter->SetInputConnection(pointSource->GetOutputPort()); quantizeFilter->SetQFactor(.1); quantizeFilter->Update(); vtkPolyData* quantized = quantizeFilter->GetOutput(); std::cout << "There are " << quantized->GetNumberOfPoints() << " quantized points." << std::endl; for(vtkIdType i = 0; i < pointSource->GetOutput()->GetNumberOfPoints(); i++) { double pOrig[3]; double pQuantized[3]; pointSource->GetOutput()->GetPoint(i,pOrig); quantized->GetPoints()->GetPoint(i,pQuantized); std::cout << "Point " << i << " : (" << pOrig[0] << ", " << pOrig[1] << ", " << pOrig[2] << ")" << " (" << pQuantized[0] << ", " << pQuantized[1] << ", " << pQuantized[2] << ")" << std::endl; } vtkSmartPointer<vtkPolyDataMapper> inputMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); inputMapper->SetInputConnection(pointSource->GetOutputPort()); vtkSmartPointer<vtkActor> inputActor = vtkSmartPointer<vtkActor>::New(); inputActor->SetMapper(inputMapper); vtkSmartPointer<vtkPolyDataMapper> quantizedMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); quantizedMapper->SetInputConnection(quantizeFilter->GetOutputPort()); vtkSmartPointer<vtkActor> quantizedActor = vtkSmartPointer<vtkActor>::New(); quantizedActor->SetMapper(quantizedMapper); // 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); // Add the sphere to the left and the cube to the right leftRenderer->AddActor(inputActor); rightRenderer->AddActor(quantizedActor); leftRenderer->ResetCamera(); rightRenderer->ResetCamera(); renderWindow->Render(); interactor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(QuantizePolyDataPoints) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(QuantizePolyDataPoints MACOSX_BUNDLE QuantizePolyDataPoints.cxx) target_link_libraries(QuantizePolyDataPoints ${VTK_LIBRARIES})
Download and Build QuantizePolyDataPoints¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download QuantizePolyDataPoints and its CMakeLists.txt file. Once the tarball QuantizePolyDataPoints.tar has been downloaded and extracted,
cd QuantizePolyDataPoints/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:
./QuantizePolyDataPoints
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.