ParametricObjectsDemo

VTKExamples/Cxx/Deprecated/GeometricObjects/ParametricObjectsDemo

Description¶

See Parametric Equations for Surfaces by Andrew Maclean for an excellent description of these beautiful parametric surfaces.

This example also demonstrates how to manipulate lists of VTK objects using vectors. Notice how parameters of the various Parametric Objects are accessed and set in the parametricObjects vector.

Other Languages

See (Python)

Code¶

ParametricObjectsDemo.cxx

#include <vtkActor.h>
#include <vtkActor2D.h>
#include <vtkCamera.h>
#include <vtkMinimalStandardRandomSequence.h>
#include <vtkNamedColors.h>
#include <vtkParametricFunctionSource.h>
#include <vtkPoints.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>
#include <vtkTextMapper.h>
#include <vtkTextProperty.h>

#include <vtkParametricBoy.h>
#include <vtkParametricConicSpiral.h>
#include <vtkParametricCrossCap.h>
#include <vtkParametricDini.h>
#include <vtkParametricEllipsoid.h>
#include <vtkParametricEnneper.h>
#include <vtkParametricFigure8Klein.h>
#include <vtkParametricKlein.h>
#include <vtkParametricMobius.h>
#include <vtkParametricRandomHills.h>
#include <vtkParametricRoman.h>
#include <vtkParametricSpline.h>
#include <vtkParametricSuperEllipsoid.h>
#include <vtkParametricSuperToroid.h>
#include <vtkParametricTorus.h>

#include <array>
#include <vector>

int main(int, char* [])
{
  vtkSmartPointer<vtkNamedColors> colors =
    vtkSmartPointer<vtkNamedColors>::New();

  // Set the background color.
  std::array<unsigned char , 4> bkg{{26, 51, 102, 255}};
    colors->SetColor("BkgColor", bkg.data());

  std::vector<vtkSmartPointer<vtkParametricFunction>> parametricObjects;
  parametricObjects.push_back(vtkSmartPointer<vtkParametricBoy>::New());
  parametricObjects.push_back(vtkSmartPointer<vtkParametricConicSpiral>::New());
  parametricObjects.push_back(vtkSmartPointer<vtkParametricCrossCap>::New());
  parametricObjects.push_back(vtkSmartPointer<vtkParametricDini>::New());

  parametricObjects.push_back(vtkSmartPointer<vtkParametricEllipsoid>::New());
  static_cast<vtkParametricEllipsoid*>(parametricObjects.back().GetPointer())
    ->SetXRadius(.5);
  static_cast<vtkParametricEllipsoid*>(parametricObjects.back().GetPointer())
    ->SetYRadius(2.0);

  parametricObjects.push_back(vtkSmartPointer<vtkParametricEnneper>::New());
  parametricObjects.push_back(
    vtkSmartPointer<vtkParametricFigure8Klein>::New());
  parametricObjects.push_back(vtkSmartPointer<vtkParametricKlein>::New());
  parametricObjects.push_back(vtkSmartPointer<vtkParametricMobius>::New());
  static_cast<vtkParametricMobius*>(parametricObjects.back().GetPointer())
    ->SetRadius(2.0);
  static_cast<vtkParametricMobius*>(parametricObjects.back().GetPointer())
    ->SetMinimumV(-0.5);
  static_cast<vtkParametricMobius*>(parametricObjects.back().GetPointer())
    ->SetMaximumV(0.5);

  vtkSmartPointer<vtkParametricRandomHills> randomHills =
    vtkSmartPointer<vtkParametricRandomHills>::New();
  randomHills->AllowRandomGenerationOff();
  parametricObjects.push_back(randomHills);

  parametricObjects.push_back(vtkSmartPointer<vtkParametricRoman>::New());

  parametricObjects.push_back(
    vtkSmartPointer<vtkParametricSuperEllipsoid>::New());
  static_cast<vtkParametricSuperEllipsoid*>(
    parametricObjects.back().GetPointer())
    ->SetN1(.50);
  static_cast<vtkParametricSuperEllipsoid*>(
    parametricObjects.back().GetPointer())
    ->SetN2(.1);

  parametricObjects.push_back(vtkSmartPointer<vtkParametricSuperToroid>::New());
  static_cast<vtkParametricSuperToroid*>(parametricObjects.back().GetPointer())
    ->SetN1(.2);
  static_cast<vtkParametricSuperToroid*>(parametricObjects.back().GetPointer())
    ->SetN2(3.0);

  parametricObjects.push_back(vtkSmartPointer<vtkParametricTorus>::New());

  // The spline needs points
  vtkSmartPointer<vtkParametricSpline> spline =
    vtkSmartPointer<vtkParametricSpline>::New();
  vtkSmartPointer<vtkPoints> inputPoints = vtkSmartPointer<vtkPoints>::New();
  vtkSmartPointer<vtkMinimalStandardRandomSequence> rng =
    vtkSmartPointer<vtkMinimalStandardRandomSequence>::New();
  rng->SetSeed(8775070); // For testing.
  for (auto i = 0; i < 10; ++i)
  {
    rng->Next();
    auto x = rng->GetRangeValue(0.0, 1.0);
    rng->Next();
    auto y = rng->GetRangeValue(0.0, 1.0);
    rng->Next();
    auto z = rng->GetRangeValue(0.0, 1.0);
    inputPoints->InsertNextPoint(x, y, z);
  }
  spline->SetPoints(inputPoints);
  parametricObjects.push_back(spline);

  std::vector<vtkSmartPointer<vtkParametricFunctionSource>>
    parametricFunctionSources;
  std::vector<vtkSmartPointer<vtkRenderer>> renderers;
  std::vector<vtkSmartPointer<vtkPolyDataMapper>> mappers;
  std::vector<vtkSmartPointer<vtkActor>> actors;
  std::vector<vtkSmartPointer<vtkTextMapper>> textmappers;
  std::vector<vtkSmartPointer<vtkActor2D>> textactors;

  // Create one text property for all
  vtkSmartPointer<vtkTextProperty> textProperty =
    vtkSmartPointer<vtkTextProperty>::New();
  textProperty->SetFontSize(12);
  textProperty->SetJustificationToCentered();

  vtkSmartPointer<vtkProperty> backProperty =
    vtkSmartPointer<vtkProperty>::New();
  backProperty->SetColor(colors->GetColor3d("Tomato").GetData());

  // Create a parametric function source, renderer, mapper, and actor
  // for each object
  for (auto i = 0; i < parametricObjects.size(); i++)
  {
    parametricFunctionSources.push_back(
      vtkSmartPointer<vtkParametricFunctionSource>::New());
    parametricFunctionSources[i]->SetParametricFunction(parametricObjects[i]);
    parametricFunctionSources[i]->SetUResolution(51);
    parametricFunctionSources[i]->SetVResolution(51);
    parametricFunctionSources[i]->SetWResolution(51);
    parametricFunctionSources[i]->Update();

    mappers.push_back(vtkSmartPointer<vtkPolyDataMapper>::New());
    mappers[i]->SetInputConnection(
      parametricFunctionSources[i]->GetOutputPort());

    actors.push_back(vtkSmartPointer<vtkActor>::New());
    actors[i]->SetMapper(mappers[i]);
    actors[i]->GetProperty()->SetColor(colors->GetColor3d("Banana").GetData());
    actors[i]->GetProperty()->SetSpecular(.5);
    actors[i]->GetProperty()->SetSpecularPower(20);
    actors[i]->SetBackfaceProperty(backProperty);

    textmappers.push_back(vtkSmartPointer<vtkTextMapper>::New());
    textmappers[i]->SetInput(parametricObjects[i]->GetClassName());
    textmappers[i]->SetTextProperty(textProperty);

    textactors.push_back(vtkSmartPointer<vtkActor2D>::New());
    textactors[i]->SetMapper(textmappers[i]);
    textactors[i]->SetPosition(100, 16);

    renderers.push_back(vtkSmartPointer<vtkRenderer>::New());
    renderers[i]->AddActor(actors[i]);
    renderers[i]->AddActor(textactors[i]);
    renderers[i]->SetBackground(colors->GetColor3d("BkgColor").GetData());
  }

  // Setup the viewports
  auto xGridDimensions = 4;
  auto yGridDimensions = 4;
  auto rendererSize = 200;
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->SetWindowName("Parametric Objects Demonstration");
  renderWindow->SetSize(rendererSize * xGridDimensions,
                        rendererSize * yGridDimensions);

  for(auto row = 0; row < yGridDimensions; row++)
  {
    for(auto col = 0; col < xGridDimensions; col++)
    {
      int index = row * xGridDimensions + col;

      // (xmin, ymin, xmax, ymax)
      double viewport[4] = {
        static_cast<double>(col) / xGridDimensions,
        static_cast<double>(yGridDimensions - (row + 1))/ yGridDimensions,
        static_cast<double>(col + 1) / xGridDimensions,
        static_cast<double>(yGridDimensions - row) / yGridDimensions
      };

      if(index > int(actors.size()) - 1)
      {
        // Add a renderer even if there is no actor.
        // This makes the render window background all the same color.
        vtkSmartPointer<vtkRenderer> ren = vtkSmartPointer<vtkRenderer>::New();
        ren->SetBackground(colors->GetColor3d("BkgColor").GetData());
        ren->SetViewport(viewport);
        renderWindow->AddRenderer(ren);
        continue;
      }

      renderers[index]->SetViewport(viewport);
      renderers[index]->ResetCamera();
      renderers[index]->GetActiveCamera()->Azimuth(30);
      renderers[index]->GetActiveCamera()->Elevation(-30);
      renderers[index]->ResetCameraClippingRange();
      renderWindow->AddRenderer(renderers[index]);
    }
  }

  vtkSmartPointer<vtkRenderWindowInteractor> interactor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);

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

  return EXIT_SUCCESS;
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ParametricObjectsDemo)

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

Download and Build ParametricObjectsDemo¶

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

cd ParametricObjectsDemo/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:

./ParametricObjectsDemo

WINDOWS USERS

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