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TriangleSolidColor

vtk-examples/Cxx/PolyData/TriangleSolidColor


Question

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Code

TriangleSolidColor.cxx

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

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

int main(int, char*[])
{
  vtkNew<vtkNamedColors> nc;

  // Setup points
  vtkNew<vtkPoints> points;
  // vtkNew<vtkCellArray> vertices;
  points->InsertNextPoint(0.0, 0.0, 0.0);
  points->InsertNextPoint(1.0, 0.0, 0.0);
  points->InsertNextPoint(0.0, 1.0, 0.0);

  vtkNew<vtkUnsignedCharArray> colors;
  colors->SetNumberOfComponents(3);
  colors->SetName("Colors");
  // Pick a color
  colors->InsertNextTupleValue(nc->GetColor3ub("LightSeaGreen").GetData());

  vtkNew<vtkCellArray> triangles;
  vtkNew<vtkTriangle> triangle;
  triangle->GetPointIds()->SetId(0, 0);
  triangle->GetPointIds()->SetId(1, 1);
  triangle->GetPointIds()->SetId(2, 2);
  triangles->InsertNextCell(triangle);

  vtkNew<vtkPolyData> polydata;

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

  // Visualize
  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputData(polydata);

  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);

  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("TriangleSolidColor");

  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  renderer->AddActor(actor);
  renderer->SetBackground(nc->GetColor3d("SlateGray").GetData());
  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 
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkIOXML
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  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.