VisualizeStructuredGrid

VTKEx/Cxx/StructuredGrid/VisualizeStructuredGrid

Description

Visualize the points of a structured grid.

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code

VisualizeStructuredGrid.cxx

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

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

  vtkSmartPointer<vtkPoints> points =
    vtkSmartPointer<vtkPoints>::New();
  unsigned int numi = 2;
  unsigned int numj = 3;
  unsigned int numk = 2;

  for(unsigned int k = 0; k < numk; k++)
  {
    for(unsigned int j = 0; j < numj; j++)
    {
      for(unsigned int i = 0; i < numi; i++)
      {
        points->InsertNextPoint(i, j, k);
      }
    }
  }

  // Specify the dimensions of the grid
  structuredGrid->SetDimensions(numi, numj, numk);
  structuredGrid->SetPoints(points);

  std::cout << "There are " << structuredGrid->GetNumberOfPoints() << " points." << std::endl; // there should be 2*3*2 = 12 points
  std::cout << "There are " << structuredGrid->GetNumberOfCells() << " cells." << std::endl; // The 12 points define the corners of 2 cubes/cells (4 points are shared by both cubes)

  vtkSmartPointer<vtkStructuredGridGeometryFilter> geometryFilter =
    vtkSmartPointer<vtkStructuredGridGeometryFilter>::New();
  geometryFilter->SetInputData(structuredGrid);
  geometryFilter->Update();

  // Create a mapper and actor
  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(geometryFilter->GetOutputPort());
  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  actor->GetProperty()->SetPointSize(3);

  // 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(.2, .3, .4);

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(VisualizeStructuredGrid)

find_package(VTK COMPONENTS 
  vtkvtkCommonCore
  vtkvtkCommonDataModel
  vtkvtkFiltersGeometry
  vtkvtkIOXML
  vtkvtkInteractionStyle
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping VisualizeStructuredGrid: ${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(VisualizeStructuredGrid MACOSX_BUNDLE VisualizeStructuredGrid.cxx )
  target_link_libraries(VisualizeStructuredGrid PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(VisualizeStructuredGrid MACOSX_BUNDLE VisualizeStructuredGrid.cxx )
  target_link_libraries(VisualizeStructuredGrid PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS VisualizeStructuredGrid
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build VisualizeStructuredGrid

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

cd VisualizeStructuredGrid/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:

./VisualizeStructuredGrid

WINDOWS USERS

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