SelectPolyData

VTKExamples/Cxx/PolyData/SelectPolyData

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Question

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Code¶

SelectPolyData.cxx

#include <vtkSmartPointer.h>
#include <vtkProperty.h>
#include <vtkSelectPolyData.h>
#include <vtkSphereSource.h>
#include <vtkClipPolyData.h>
#include <vtkProperty.h>
#include <vtkPolyDataMapper.h>
#include <vtkLODActor.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>

#include <vtkNamedColors.h>

int main(int, char *[])
{

  vtkSmartPointer<vtkNamedColors> colors =
    vtkSmartPointer<vtkNamedColors>::New();

  vtkSmartPointer<vtkSphereSource> sphereSource = 
    vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->SetPhiResolution(50);
  sphereSource->SetThetaResolution(100);
  sphereSource->Update();

  vtkSmartPointer<vtkPoints> selectionPoints =
    vtkSmartPointer<vtkPoints>::New();

  selectionPoints->InsertPoint( 0, -0.16553, 0.135971, 0.451972 );
  selectionPoints->InsertPoint( 1, -0.0880123, -0.134952, 0.4747);
  selectionPoints->InsertPoint( 2,  0.00292618, -0.134604, 0.482459 );
  selectionPoints->InsertPoint( 3, 0.0641941, 0.067112, 0.490947);
  selectionPoints->InsertPoint( 4, 0.15577, 0.0734765, 0.469245);
  selectionPoints->InsertPoint( 5, 0.166667, -0.129217, 0.454622 );
  selectionPoints->InsertPoint( 6, 0.241259, -0.123363, 0.420581);
  selectionPoints->InsertPoint( 7,  0.240334, 0.0727106, 0.432555);
  selectionPoints->InsertPoint( 8, 0.308529, 0.0844311, 0.384357 );
  selectionPoints->InsertPoint( 9, 0.32672, -0.121674, 0.359187);
  selectionPoints-> InsertPoint( 10, 0.380721, -0.117342, 0.302527);
  selectionPoints ->InsertPoint( 11, 0.387804, 0.0455074, 0.312375 );
  selectionPoints ->InsertPoint( 12, 0.43943, -0.111673, 0.211707);
  selectionPoints ->InsertPoint( 13, 0.470984, -0.0801913, 0.147919);
  selectionPoints ->InsertPoint( 14, 0.436777, 0.0688872, 0.233021 );
  selectionPoints ->InsertPoint( 15, 0.44874, 0.188852, 0.109882);
  selectionPoints ->InsertPoint( 16, 0.391352, 0.254285, 0.176943);
  selectionPoints ->InsertPoint( 17, 0.373274, 0.154162, 0.294296 );
  selectionPoints ->InsertPoint( 18, 0.274659, 0.311654, 0.276609);
  selectionPoints ->InsertPoint( 19, 0.206068, 0.31396, 0.329702);
  selectionPoints ->InsertPoint( 20, 0.263789, 0.174982, 0.387308 );
  selectionPoints ->InsertPoint( 21, 0.213034, 0.175485, 0.417142);
  selectionPoints ->InsertPoint( 22, 0.169113, 0.261974, 0.390286);
  selectionPoints ->InsertPoint( 23, 0.102552, 0.25997, 0.414814 );
  selectionPoints ->InsertPoint( 24, 0.131512, 0.161254, 0.454705);
  selectionPoints ->InsertPoint( 25, 0.000192443, 0.156264, 0.475307);
  selectionPoints ->InsertPoint( 26, -0.0392091, 0.000251724, 0.499943); 
  selectionPoints ->InsertPoint( 27, -0.096161, 0.159646, 0.46438 );

  vtkSmartPointer<vtkSelectPolyData> loop =
    vtkSmartPointer<vtkSelectPolyData>::New();
  loop->SetInputConnection(sphereSource->GetOutputPort());
  loop->SetLoop(selectionPoints);
  loop->GenerateSelectionScalarsOn();
  loop->SetSelectionModeToSmallestRegion(); //negative scalars inside

  vtkSmartPointer<vtkClipPolyData> clip = //clips out positive region
    vtkSmartPointer<vtkClipPolyData>::New();
  clip->SetInputConnection(loop->GetOutputPort());

  vtkSmartPointer<vtkPolyDataMapper> clipMapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
  clipMapper->SetInputConnection(clip->GetOutputPort());
  clipMapper->ScalarVisibilityOff();

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

  vtkSmartPointer<vtkLODActor> clipActor = 
    vtkSmartPointer<vtkLODActor>::New();
  clipActor->SetMapper(clipMapper);
  clipActor->SetBackfaceProperty(backProp);
  clipActor->GetProperty()->SetColor(colors->GetColor3d("banana").GetData());

  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();

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

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

  // Add the actors to the renderer, set the background and size
  renderer->AddActor (clipActor);
  renderer->SetBackground (colors->GetColor3d("slate_grey").GetData());

  renderWindow->SetSize (500, 500);

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


  return EXIT_SUCCESS;
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(SelectPolyData)

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

Download and Build SelectPolyData¶

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

cd SelectPolyData/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:

./SelectPolyData

WINDOWS USERS

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