DelimitedTextReader
VTKExamples/Cxx/InfoVis/DelimitedTextReader
Description¶
This example takes a plain text file of coordinates and normals (x y z nx ny nz) and reads them into a vtkPolyData and displays them on the screen. This can be easily changed to reading a file with any delimiter by changing the argument of
Here is an example file:
0.0 0.0 0.0 1.0 2.0 3.0 1.0 0.0 0.0 4.0 5.0 6.1 0.0 1.0 0.0 7.2 8.3 9.4
Code¶
DelimitedTextReader.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkProperty.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkDelimitedTextReader.h> #include <vtkDoubleArray.h> #include <vtkTable.h> #include <vtkPointData.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkVertexGlyphFilter.h> int main(int argc, char* argv[]) { // Verify input arguments if(argc != 2) { std::cout << "Usage: " << argv[0] << " Filename(.xyz)" << std::endl; return EXIT_FAILURE; } std::string inputFilename = argv[1]; vtkSmartPointer<vtkDelimitedTextReader> reader = vtkSmartPointer<vtkDelimitedTextReader>::New(); reader->SetFileName(inputFilename.c_str()); reader->DetectNumericColumnsOn(); reader->SetFieldDelimiterCharacters(" "); reader->Update(); vtkTable* table = reader->GetOutput(); vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); vtkSmartPointer<vtkDoubleArray> normals = vtkSmartPointer<vtkDoubleArray>::New(); normals->SetNumberOfComponents(3); //3d normals (ie x,y,z) std::cout << "Table has " << table->GetNumberOfRows() << " rows." << std::endl; std::cout << "Table has " << table->GetNumberOfColumns() << " columns." << std::endl; for(vtkIdType i = 0; i < table->GetNumberOfRows(); i++) { std::cout << "x: " << (table->GetValue(i,0)).ToDouble() << " y: " << (table->GetValue(i,1)).ToDouble() << " z: " << (table->GetValue(i,2)).ToDouble(); points->InsertNextPoint((table->GetValue(i,0)).ToDouble(), (table->GetValue(i,1)).ToDouble(), (table->GetValue(i,2)).ToDouble()); double n[3]; n[0] = (table->GetValue(i,3)).ToDouble(); n[1] = (table->GetValue(i,4)).ToDouble(); n[2] = (table->GetValue(i,5)).ToDouble(); std::cout << " n: " << n[0] << " " << n[1] << " " << n[2] << std::endl; normals->InsertNextTuple(n); } std::cout << "There are " << points->GetNumberOfPoints() << " points." << std::endl; vtkSmartPointer<vtkPolyData> polydata = vtkSmartPointer<vtkPolyData>::New(); polydata->SetPoints(points); polydata->GetPointData()->SetNormals(normals); vtkSmartPointer<vtkVertexGlyphFilter> glyphFilter = vtkSmartPointer<vtkVertexGlyphFilter>::New(); #if VTK_MAJOR_VERSION <= 5 glyphFilter->SetInputConnection(polydata->GetProducerPort()); #else glyphFilter->SetInputData(polydata); #endif glyphFilter->Update(); // Visualize vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputConnection(glyphFilter->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); actor->GetProperty()->SetPointSize(3); actor->GetProperty()->SetColor(1,0,0); vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); renderer->AddActor(actor); renderer->SetBackground(.3, .6, .3); // Background color green renderWindow->Render(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(DelimitedTextReader) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(DelimitedTextReader MACOSX_BUNDLE DelimitedTextReader.cxx) target_link_libraries(DelimitedTextReader ${VTK_LIBRARIES})
Download and Build DelimitedTextReader¶
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 DelimitedTextReader and its CMakeLists.txt file. Once the tarball DelimitedTextReader.tar has been downloaded and extracted,
cd DelimitedTextReader/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:
./DelimitedTextReader
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.