Skip to content

RectilinearGrid

vtk-examples/Cxx/RectilinearGrid/RectilinearGrid


Description

Shows how to create a vtkRectilinearGrid.

Other languages

See (Python), (Java)

Question

If you have a question about this example, please use the VTK Discourse Forum

Code

RectilinearGrid.cxx

#include <vtkActor.h>
#include <vtkDataSetMapper.h>
#include <vtkDoubleArray.h>
#include <vtkMath.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkProperty.h>
#include <vtkRectilinearGrid.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>

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

  // Create a grid
  vtkNew<vtkRectilinearGrid> grid;

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

  vtkNew<vtkDoubleArray> xArray;
  xArray->InsertNextValue(0.0);
  xArray->InsertNextValue(2.0);

  vtkNew<vtkDoubleArray> yArray;
  yArray->InsertNextValue(0.0);
  yArray->InsertNextValue(1.0);
  yArray->InsertNextValue(2.0);

  vtkNew<vtkDoubleArray> zArray;
  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
  vtkNew<vtkDataSetMapper> mapper;
  mapper->SetInputData(grid);

  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->SetColor(colors->GetColor3d("PeachPuff").GetData());

  // Visualize
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("RectilinearGrid");

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

  renderer->AddActor(actor);
  renderer->SetBackground(colors->GetColor3d("SlateGray").GetData());

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(RectilinearGrid)

find_package(VTK COMPONENTS 
  CommonColor
  CommonCore
  CommonDataModel
  InteractionStyle
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
  QUIET
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "RectilinearGrid: 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(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}
)

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.