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QuadraticTetra

Repository source: QuadraticTetra

Description

The quadratic tetrahedron is a primary three-dimensional cell. It is defined by ten points. The first four points are located at the vertices of the tetrahedron; the next six are located in the middle of each of the six edges.

Other languages

See (Python)

Question

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

Code

QuadraticTetra.cxx

#include <vtkActor.h>
#include <vtkDataSetMapper.h>
#include <vtkGlyph3D.h>
#include <vtkMinimalStandardRandomSequence.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPoints.h>
#include <vtkProperty.h>
#include <vtkQuadraticTetra.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkTessellatorFilter.h>
#include <vtkUnstructuredGrid.h>

namespace {
vtkSmartPointer<vtkUnstructuredGrid> MakeQuadraticTetra();
}

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

  auto uGrid = MakeQuadraticTetra();

  vtkNew<vtkTessellatorFilter> tessellate;
  tessellate->SetInputData(uGrid);

  vtkNew<vtkDataSetMapper> mapper;
  mapper->SetInputConnection(tessellate->GetOutputPort());
  mapper->ScalarVisibilityOff();

  // Create an actor for the grid
  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->SetDiffuseColor(
      namedColors->GetColor3d("Tomato").GetData());
  actor->GetProperty()->SetEdgeColor(
      namedColors->GetColor3d("IvoryBlack").GetData());
  actor->GetProperty()->EdgeVisibilityOn();

  vtkNew<vtkSphereSource> sphereSource;
  sphereSource->SetRadius(0.02);

  vtkNew<vtkGlyph3D> glyph3D;
  glyph3D->SetInputData(uGrid);
  glyph3D->SetSourceConnection(sphereSource->GetOutputPort());
  glyph3D->ScalingOff();
  glyph3D->Update();

  vtkNew<vtkDataSetMapper> glyph3DMapper;
  glyph3DMapper->SetInputConnection(glyph3D->GetOutputPort());
  glyph3DMapper->ScalarVisibilityOff();

  vtkNew<vtkActor> glyph3DActor;
  glyph3DActor->SetMapper(glyph3DMapper);
  glyph3DActor->GetProperty()->SetColor(
      namedColors->GetColor3d("Banana").GetData());

  // Visualize
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->SetWindowName("QuadraticTetra");
  renderWindow->AddRenderer(renderer);
  vtkNew<vtkRenderWindowInteractor> interactor;
  interactor->SetRenderWindow(renderWindow);

  renderer->AddActor(actor);
  renderer->AddActor(glyph3DActor);
  renderer->SetBackground(namedColors->GetColor3d("SlateGray").GetData());

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

  return EXIT_SUCCESS;
}

namespace {
vtkSmartPointer<vtkUnstructuredGrid> MakeQuadraticTetra()
{
  vtkNew<vtkQuadraticTetra> aTetra;
  vtkNew<vtkPoints> points;

  double* pcoords = aTetra->GetParametricCoords();
  vtkNew<vtkMinimalStandardRandomSequence> rng;
  points->SetNumberOfPoints(aTetra->GetNumberOfPoints());
  rng->SetSeed(5070); // for testing
  for (auto i = 0; i < aTetra->GetNumberOfPoints(); ++i)
  {
    double perturbation[3];
    for (auto j = 0; j < 3; ++j)
    {
      rng->Next();
      perturbation[j] = rng->GetRangeValue(-0.1, 0.1);
    }
    aTetra->GetPointIds()->SetId(i, i);
    points->SetPoint(i, *(pcoords + 3 * i) + perturbation[0],
                     *(pcoords + 3 * i + 1) + perturbation[1],
                     *(pcoords + 3 * i + 2) + perturbation[2]);
  }

  // Add the points and tetra to an unstructured grid
  vtkSmartPointer<vtkUnstructuredGrid> uGrid =
      vtkSmartPointer<vtkUnstructuredGrid>::New();
  uGrid->SetPoints(points);
  uGrid->InsertNextCell(aTetra->GetCellType(), aTetra->GetPointIds());

  return uGrid;
}
} // namespace

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(QuadraticTetra)

find_package(VTK COMPONENTS 
  CommonColor
  CommonCore
  CommonDataModel
  FiltersCore
  FiltersGeneral
  FiltersSources
  InteractionStyle
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "QuadraticTetra: 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(QuadraticTetra MACOSX_BUNDLE QuadraticTetra.cxx )
  target_link_libraries(QuadraticTetra PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS QuadraticTetra
  MODULES ${VTK_LIBRARIES}
)

Download and Build QuadraticTetra

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

cd QuadraticTetra/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:

./QuadraticTetra

WINDOWS USERS

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