TriangleSolidColor

VTKExamples/Cxx/PolyData/TriangleSolidColor


Code

TriangleSolidColor.cxx

#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkXMLPolyDataWriter.h>
#include <vtkPolyData.h>
#include <vtkCellData.h>
#include <vtkCellArray.h>
#include <vtkTriangle.h>
#include <vtkUnsignedCharArray.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>

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

int main(int, char *[])
{
  // Setup points
  vtkSmartPointer<vtkPoints> points =
    vtkSmartPointer<vtkPoints>::New();
  vtkSmartPointer<vtkCellArray> vertices =
    vtkSmartPointer<vtkCellArray>::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);

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

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

  vtkSmartPointer<vtkCellArray> triangles =
    vtkSmartPointer<vtkCellArray>::New();
  vtkSmartPointer<vtkTriangle> triangle =
    vtkSmartPointer<vtkTriangle>::New();
  triangle->GetPointIds()->SetId(0, 0);
  triangle->GetPointIds()->SetId(1, 1);
  triangle->GetPointIds()->SetId(2, 2);
  triangles->InsertNextCell(triangle);

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

  polydata->SetPoints(points);
  polydata->SetPolys(triangles);
  polydata->GetCellData()->SetScalars(colors);

  // Visualize
  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputData(polydata);

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

  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->ResetCamera();

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(TriangleSolidColor)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkIOXML
  vtkInteractionStyle
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping TriangleSolidColor: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(TriangleSolidColor MACOSX_BUNDLE TriangleSolidColor.cxx )
  target_link_libraries(TriangleSolidColor PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(TriangleSolidColor MACOSX_BUNDLE TriangleSolidColor.cxx )
  target_link_libraries(TriangleSolidColor PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS TriangleSolidColor
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build TriangleSolidColor

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

cd TriangleSolidColor/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:

./TriangleSolidColor

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.