ImplicitPolyDataDistance

VTKExamples/Cxx/PolyData/ImplicitPolyDataDistance


Description

NOTE: This example requires version 5.9.20111206 or higher.

Other Languages

See (Python)

Code

ImplicitPolyDataDistance.cxx

#include <vtkImplicitPolyDataDistance.h>

#include <vtkActor.h>
#include <vtkFloatArray.h>
#include <vtkPointData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkVertexGlyphFilter.h>

int main(int, char *[])
{
  vtkSmartPointer<vtkSphereSource> sphereSource =
    vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->SetCenter(0.0, 0.0, 0.0);
  sphereSource->SetRadius(1.0f);
  sphereSource->Update();
  vtkSmartPointer<vtkPolyDataMapper> sphereMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  sphereMapper->SetInputConnection( sphereSource->GetOutputPort() );
  sphereMapper->ScalarVisibilityOff();
  vtkSmartPointer<vtkActor> sphereActor =
    vtkSmartPointer<vtkActor>::New();
  sphereActor->SetMapper( sphereMapper );
  sphereActor->GetProperty()->SetOpacity(.3);
  sphereActor->GetProperty()->SetColor(1,0,0);

  vtkSmartPointer<vtkImplicitPolyDataDistance> implicitPolyDataDistance =
    vtkSmartPointer<vtkImplicitPolyDataDistance>::New();
  implicitPolyDataDistance->SetInput(sphereSource->GetOutput());

  // Setup a grid
  vtkSmartPointer<vtkPoints> points =
    vtkSmartPointer<vtkPoints>::New();
  float step = 0.1;
  for(float x = - 2.0; x <= 2.0; x += step)
  {
    for(float y = - 2.0; y <= 2.0; y += step)
    {
      for(float z = - 2.0; z <= 2.0; z += step)
      {
        points->InsertNextPoint(x,y,z);
      }
    }
  }

  // Add distances to each point
  vtkSmartPointer<vtkFloatArray> signedDistances =
    vtkSmartPointer<vtkFloatArray>::New();
  signedDistances->SetNumberOfComponents(1);
  signedDistances->SetName("SignedDistances");

  // Evaluate the signed distance function at all of the grid points
  for(vtkIdType pointId = 0; pointId < points->GetNumberOfPoints(); ++pointId)
  {
    double p[3];
    points->GetPoint(pointId, p);
    float signedDistance = implicitPolyDataDistance->EvaluateFunction(p);
    signedDistances->InsertNextValue(signedDistance);
  }

  vtkSmartPointer<vtkPolyData> polyData =
    vtkSmartPointer<vtkPolyData>::New();
  polyData->SetPoints(points);
  polyData->GetPointData()->SetScalars(signedDistances);

  vtkSmartPointer<vtkVertexGlyphFilter> vertexGlyphFilter =
    vtkSmartPointer<vtkVertexGlyphFilter>::New();
  vertexGlyphFilter->SetInputData(polyData);
  vertexGlyphFilter->Update();

  vtkSmartPointer<vtkPolyDataMapper> signedDistanceMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  signedDistanceMapper->SetInputConnection(vertexGlyphFilter->GetOutputPort());
  signedDistanceMapper->ScalarVisibilityOn();

  vtkSmartPointer<vtkActor> signedDistanceActor =
    vtkSmartPointer<vtkActor>::New();
  signedDistanceActor->SetMapper( signedDistanceMapper );

  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderer->AddViewProp(sphereActor);
  renderer->AddViewProp(signedDistanceActor);

  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer( renderer );

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

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ImplicitPolyDataDistance)

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

Download and Build ImplicitPolyDataDistance

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

cd ImplicitPolyDataDistance/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:

./ImplicitPolyDataDistance

WINDOWS USERS

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