ImplicitSphere

VTKExamples/Cxx/ImplicitFunctions/ImplicitSphere


Description

This example creates an isosurface of sampled sphere.

Code

ImplicitSphere.cxx

#include <vtkActor.h>
#include <vtkContourFilter.h>
#include <vtkImageData.h>
#include <vtkNamedColors.h>
#include <vtkOutlineFilter.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSampleFunction.h>
#include <vtkSmartPointer.h>
#include <vtkSphere.h>

#include <algorithm>
#include <array>

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

  // Set the background color.
  std::array<unsigned char , 4> bkg{{51, 77, 102, 255}};
    colors->SetColor("BkgColor", bkg.data());

  vtkSmartPointer<vtkSphere> sphere = 
    vtkSmartPointer<vtkSphere>::New();

  // Sample the function
  vtkSmartPointer<vtkSampleFunction> sample = 
    vtkSmartPointer<vtkSampleFunction>::New();
  sample->SetSampleDimensions(50,50,50);
  sample->SetImplicitFunction(sphere);
  double value = 2.0;
  double xmin = -value, xmax = value,
    ymin = -value, ymax = value,
    zmin = -value, zmax = value;
  sample->SetModelBounds(xmin, xmax, ymin, ymax, zmin, zmax);

  // Create the 0 isosurface
  vtkSmartPointer<vtkContourFilter> contours = 
    vtkSmartPointer<vtkContourFilter>::New();
  contours->SetInputConnection(sample->GetOutputPort());
  contours->GenerateValues(1, 1, 1);

  // Map the contours to graphical primitives
  vtkSmartPointer<vtkPolyDataMapper> contourMapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
  contourMapper->SetInputConnection(contours->GetOutputPort());
  contourMapper->ScalarVisibilityOff();

  // Create an actor for the contours
  vtkSmartPointer<vtkActor> contourActor = 
    vtkSmartPointer<vtkActor>::New();
  contourActor->SetMapper(contourMapper);

  // Visualize
  vtkSmartPointer<vtkRenderer> renderer = 
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow = 
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);
  vtkSmartPointer<vtkRenderWindowInteractor> interactor = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);

  renderer->AddActor(contourActor);
  renderer->SetBackground(colors->GetColor3d("BkgColor").GetData());

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(ImplicitSphere)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

add_executable(ImplicitSphere MACOSX_BUNDLE ImplicitSphere.cxx )

target_link_libraries(ImplicitSphere ${VTK_LIBRARIES})

Download and Build ImplicitSphere

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

cd ImplicitSphere/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:

./ImplicitSphere

WINDOWS USERS

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