ImplicitQuadric

VTKExamples/Cxx/ImplicitFunctions/ImplicitQuadric


Create an ellipsoid by using the implicit quadric.

Question

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Code

ImplicitQuadric.cxx

#include <vtkQuadric.h>
#include <vtkBox.h>
#include <vtkImplicitBoolean.h>
#include <vtkSampleFunction.h>
#include <vtkContourFilter.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkNamedColors.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkCamera.h>
#include <vtkProperty.h>
#include <vtkColor.h>

#include <cstdlib>

int main(int argc, char *argv[])
{
  // Define colors
  auto colors =
    vtkSmartPointer<vtkNamedColors>::New();
  vtkColor3d actorColor = colors->GetColor3d("AliceBlue");
  vtkColor3d  EdgeColour = colors->GetColor3d("SteelBlue");
  vtkColor3d BackgroundColour = colors->GetColor3d("Silver");

  // create a Quadric
  auto quadric = vtkSmartPointer<vtkQuadric>::New();
  quadric->SetCoefficients(0.5, 1, 0.2, 0, 0.1, 0, 0, 0.2, 0, 0);

   /*The sample function generates a distance function from the implicit
     function.This is then contoured to get a polygonal surface.*/
  auto sample =
    vtkSmartPointer<vtkSampleFunction>::New();
  sample->SetImplicitFunction(quadric);
  sample->SetModelBounds(-0.5, 0.5, -0.5, 0.5, -0.5, 0.5);
  sample->SetSampleDimensions(40, 40, 40);
  sample->ComputeNormalsOff();

  // contour
  auto surface =
    vtkSmartPointer<vtkContourFilter>::New();
  surface->SetInputConnection(sample->GetOutputPort());
  surface->SetValue(0, 0.0);

  //Create a mapper and an actor
  auto mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(surface->GetOutputPort());
  mapper->ScalarVisibilityOff();
  auto actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  actor->GetProperty()->EdgeVisibilityOn();
  actor->GetProperty()->SetColor(actorColor.GetData());
  actor->GetProperty()->SetEdgeColor(EdgeColour.GetData());


  // A renderer and render window
  auto renderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderer->SetBackground(BackgroundColour.GetData());
  auto renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  auto renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);
  //add the actor
  renderer->AddActor(actor);
  // Start
  renderWindow->Render();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ImplicitQuadric)

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

Download and Build ImplicitQuadric

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

cd ImplicitQuadric/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:

./ImplicitQuadric

WINDOWS USERS

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