BlankPoint

VTKExamples/Cxx/StructuredGrid/BlankPoint


Other Languages

See (Java)

Code

BlankPoint.cxx

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

int main(int, char *[])
{
  // Create a grid
  vtkSmartPointer<vtkStructuredGrid> structuredGrid =
    vtkSmartPointer<vtkStructuredGrid>::New();

  vtkSmartPointer<vtkPoints> points =
    vtkSmartPointer<vtkPoints>::New();

  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
      {
        points->InsertNextPoint(i, j, 0); // Make most of the points the same height
      }
      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
  vtkSmartPointer<vtkDataSetMapper> gridMapper =
    vtkSmartPointer<vtkDataSetMapper>::New();
  gridMapper->SetInputData(structuredGrid);

  vtkSmartPointer<vtkActor> gridActor =
    vtkSmartPointer<vtkActor>::New();
  gridActor->SetMapper(gridMapper);
  gridActor->GetProperty()->EdgeVisibilityOn();
  gridActor->GetProperty()->SetEdgeColor(0,0,1);

  // Create a renderer, render window, and interactor
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  // Add the actor to the scene
  renderer->AddActor(gridActor);
  renderer->SetBackground(.3, .6, .3); // Background color green

  // 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 
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersGeometry
  vtkIOXML
  vtkInteractionStyle
  vtkRenderingCore
  vtkRenderingFreeType
  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.