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BlankPoint

vtk-examples/Cxx/StructuredGrid/BlankPoint


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Question

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Code

BlankPoint.cxx

#include <vtkActor.h>
#include <vtkDataSetMapper.h>
#include <vtkIdList.h>
#include <vtkMath.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkStructuredGrid.h>
#include <vtkStructuredGridGeometryFilter.h>
#include <vtkXMLPolyDataWriter.h>
#include <vtkXMLStructuredGridWriter.h>

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

  // Create a grid
  vtkNew<vtkStructuredGrid> structuredGrid;

  vtkNew<vtkPoints> points;

  unsigned int gridSize = 8;
  unsigned int counter = 0;
  // Create a 5x5 grid of points
  for (unsigned int j = 0; j < gridSize; j++)
  {
    for (unsigned int i = 0; i < gridSize; i++)
    {
      if (i == 3 && j == 3) // Make one point higher than the rest
      {
        points->InsertNextPoint(i, j, 2);
        std::cout << "The different point is number " << counter << std::endl;
      }
      else
      {
        // Make most of the points the same height
        points->InsertNextPoint(i, j, 0);
      }
      counter++;
    }
  }

  // Specify the dimensions of the grid
  structuredGrid->SetDimensions(gridSize, gridSize, 1);

  structuredGrid->SetPoints(points);

  structuredGrid->BlankPoint(27);
  structuredGrid->Modified();

  // Create a mapper and actor
  vtkNew<vtkDataSetMapper> gridMapper;
  gridMapper->SetInputData(structuredGrid);

  vtkNew<vtkActor> gridActor;
  gridActor->SetMapper(gridMapper);
  gridActor->GetProperty()->EdgeVisibilityOn();
  gridActor->GetProperty()->SetEdgeColor(colors->GetColor3d("Blue").GetData());

  // Create a renderer, render window, and interactor
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("BlankPoint");

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

  // Add the actor to the scene
  renderer->AddActor(gridActor);
  renderer->SetBackground(colors->GetColor3d("ForestGreen").GetData());

  // Render and interact
  renderWindow->Render();

  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(BlankPoint)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersGeometry
  vtkIOXML
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping BlankPoint: ${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(BlankPoint MACOSX_BUNDLE BlankPoint.cxx )
  target_link_libraries(BlankPoint PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(BlankPoint MACOSX_BUNDLE BlankPoint.cxx )
  target_link_libraries(BlankPoint PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS BlankPoint
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build BlankPoint

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

cd BlankPoint/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:

./BlankPoint

WINDOWS USERS

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