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
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.