HyperTreeGridSource

VTKExamples/Cxx/HyperTreeGrid/HyperTreeGridSource


Other Languages

See (Python), (Java)

Question

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Code

HyperTreeGridSource.cxx

#include <vtkHyperTreeGridSource.h>
#include <vtkHyperTreeGridToUnstructuredGrid.h>

#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkDataSetMapper.h>
#include <vtkNamedColors.h>
#include <vtkPolyData.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkShrinkFilter.h>
#include <vtkSmartPointer.h>
#include <vtkVersion.h>

#include <cstdlib>

int main(int, char*[])
{
  // Create hyper tree grid source
  auto source = vtkSmartPointer<vtkHyperTreeGridSource>::New();
#if VTK_VERSION_NUMBER >= 89000000000ULL
  source->SetMaxDepth(6);
#else
  source->SetMaximumLevel(6);
#endif
  source->SetDimensions(4, 4, 3); // GridCell 3, 3, 2
  source->SetGridScale(1.5, 1.0, 0.7);
  source->SetBranchFactor(4);
  source->SetDescriptor(
      "RRR .R. .RR ..R ..R .R.|R.......................... "
      "........................... ........................... "
      ".............R............. ....RR.RR........R......... "
      ".....RRRR.....R.RR......... ........................... "
      "........................... "
      "...........................|........................... "
      "........................... ........................... "
      "...RR.RR.......RR.......... ........................... "
      "RR......................... ........................... "
      "........................... ........................... "
      "........................... ........................... "
      "........................... ........................... "
      "............RRR............|........................... "
      "........................... .......RR.................. "
      "........................... ........................... "
      "........................... ........................... "
      "........................... ........................... "
      "........................... "
      "...........................|........................... "
      "...........................");
  source->Update();

  // Hyper tree grid to unstructured grid filter
  auto htg2ug = vtkSmartPointer<vtkHyperTreeGridToUnstructuredGrid>::New();
  htg2ug->SetInputConnection(source->GetOutputPort());
  htg2ug->Update();

  auto shrink = vtkSmartPointer<vtkShrinkFilter>::New();
  shrink->SetInputConnection(htg2ug->GetOutputPort());
  shrink->SetShrinkFactor(0.8);

  auto mapper = vtkSmartPointer<vtkDataSetMapper>::New();
  mapper->SetInputConnection(shrink->GetOutputPort());
  mapper->ScalarVisibilityOff();

  auto colors = vtkSmartPointer<vtkNamedColors>::New();

  auto actor = vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  actor->GetProperty()->SetDiffuseColor(
      colors->GetColor3d("Burlywood").GetData());

  // Create the RenderWindow, Renderer and Interactor
  //
  auto renderer = vtkSmartPointer<vtkRenderer>::New();
  auto renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  auto interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);

  renderer->SetBackground(colors->GetColor3d("SlateGray").GetData());
  renderer->AddActor(actor);
  renderer->ResetCamera();
  renderer->GetActiveCamera()->Azimuth(150);
  renderer->GetActiveCamera()->Elevation(30);
  renderer->ResetCameraClippingRange();

  renderWindow->SetSize(640, 480);
  renderWindow->Render();
  renderWindow->SetWindowName("HyperTreeGridSource");
  interactor->Start();
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(HyperTreeGridSource)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersGeneral
  vtkFiltersHyperTree
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping HyperTreeGridSource: ${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(HyperTreeGridSource MACOSX_BUNDLE HyperTreeGridSource.cxx )
  target_link_libraries(HyperTreeGridSource PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(HyperTreeGridSource MACOSX_BUNDLE HyperTreeGridSource.cxx )
  target_link_libraries(HyperTreeGridSource PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS HyperTreeGridSource
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build HyperTreeGridSource

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

cd HyperTreeGridSource/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:

./HyperTreeGridSource

WINDOWS USERS

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