TriangleSolidColor

#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>

// 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;
}

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(TriangleSolidColor)

find_package(VTK COMPONENTS 
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "TriangleSolidColor: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
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}
)

cd TriangleSolidColor/build

cmake ..

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

make

./TriangleSolidColor