RectilinearGrid

VTKExamples/Cxx/RectilinearGrid/RectilinearGrid

Other Languages

See (Python), (Java)

Question

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Code

RectilinearGrid.cxx

#include <vtkSmartPointer.h>
#include <vtkRectilinearGrid.h>
#include <vtkMath.h>
#include <vtkDoubleArray.h>
#include <vtkDataSetMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>

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

  grid->SetDimensions(2,3,1);

  vtkSmartPointer<vtkDoubleArray> xArray =
    vtkSmartPointer<vtkDoubleArray>::New();
  xArray->InsertNextValue(0.0);
  xArray->InsertNextValue(2.0);

  vtkSmartPointer<vtkDoubleArray> yArray =
    vtkSmartPointer<vtkDoubleArray>::New();
  yArray->InsertNextValue(0.0);
  yArray->InsertNextValue(1.0);
  yArray->InsertNextValue(2.0);

  vtkSmartPointer<vtkDoubleArray> zArray =
    vtkSmartPointer<vtkDoubleArray>::New();
  zArray->InsertNextValue(0.0);

  grid->SetXCoordinates(xArray);
  grid->SetYCoordinates(yArray);
  grid->SetZCoordinates(zArray);

  std::cout << "There are " << grid->GetNumberOfPoints()
            << " points." << std::endl;
  std::cout << "There are " << grid->GetNumberOfCells()
            << " cells." << std::endl;

  for(vtkIdType id = 0; id < grid->GetNumberOfPoints(); id++)
  {
    double p[3];
    grid->GetPoint(id, p);
    std::cout << "Point " << id
              << " : (" << p[0] << " , " << p[1] << " , " << p[2] << ")" << std::endl;
  }

  // Create a mapper and actor
  vtkSmartPointer<vtkDataSetMapper> mapper =
    vtkSmartPointer<vtkDataSetMapper>::New();
  mapper->SetInputData(grid);

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

  // Visualize
  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->SetBackground(.3, .6, .3); // Background color green

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(RectilinearGrid)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkInteractionStyle
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping RectilinearGrid: ${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(RectilinearGrid MACOSX_BUNDLE RectilinearGrid.cxx )
  target_link_libraries(RectilinearGrid PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(RectilinearGrid MACOSX_BUNDLE RectilinearGrid.cxx )
  target_link_libraries(RectilinearGrid PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS RectilinearGrid
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build RectilinearGrid

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

cd RectilinearGrid/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:

./RectilinearGrid

WINDOWS USERS

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