ColoredPoints

VTKExamples/Cxx/PolyData/ColoredPoints

Code

ColoredPoints.cxx

#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
#include <vtkPointData.h>
#include <vtkCellArray.h>
#include <vtkUnsignedCharArray.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkVertexGlyphFilter.h>
#include <vtkProperty.h>

// For compatibility with new VTK generic data arrays
#ifdef vtkGenericDataArray_h
#define InsertNextTupleValue InsertNextTypedTuple
#endif

int main(int, char *[])
{
  vtkSmartPointer<vtkPoints> points =
    vtkSmartPointer<vtkPoints>::New();
  points->InsertNextPoint (0.0, 0.0, 0.0);
  points->InsertNextPoint (1.0, 0.0, 0.0);
  points->InsertNextPoint (0.0, 1.0, 0.0);

  vtkSmartPointer<vtkPolyData> pointsPolydata =
    vtkSmartPointer<vtkPolyData>::New();

  pointsPolydata->SetPoints(points);

  vtkSmartPointer<vtkVertexGlyphFilter> vertexFilter =
    vtkSmartPointer<vtkVertexGlyphFilter>::New();
#if VTK_MAJOR_VERSION <= 5
  vertexFilter->SetInputConnection(pointsPolydata->GetProducerPort());
#else
  vertexFilter->SetInputData(pointsPolydata);
#endif
  vertexFilter->Update();

  vtkSmartPointer<vtkPolyData> polydata =
    vtkSmartPointer<vtkPolyData>::New();
  polydata->ShallowCopy(vertexFilter->GetOutput());

  // Setup colors
  unsigned char red[3] = {255, 0, 0};
  unsigned char green[3] = {0, 255, 0};
  unsigned char blue[3] = {0, 0, 255};

  vtkSmartPointer<vtkUnsignedCharArray> colors =
    vtkSmartPointer<vtkUnsignedCharArray>::New();
  colors->SetNumberOfComponents(3);
  colors->SetName ("Colors");
  colors->InsertNextTupleValue(red);
  colors->InsertNextTupleValue(green);
  colors->InsertNextTupleValue(blue);

  polydata->GetPointData()->SetScalars(colors);

  // Visualization
  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
#if VTK_MAJOR_VERSION <= 5
  mapper->SetInputConnection(polydata->GetProducerPort());
#else
  mapper->SetInputData(polydata);
#endif

  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  actor->GetProperty()->SetPointSize(5);

  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);

  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(ColoredPoints)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

add_executable(ColoredPoints MACOSX_BUNDLE ColoredPoints.cxx)

target_link_libraries(ColoredPoints ${VTK_LIBRARIES})

Download and Build ColoredPoints

Click here to download ColoredPoints and its CMakeLists.txt file. Once the tarball ColoredPoints.tar has been downloaded and extracted,

cd ColoredPoints/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:

./ColoredPoints

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.