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SurfaceFromUnorganizedPoints

Repository source: SurfaceFromUnorganizedPoints

Description

This example creates points on a sphere and then finds the surface through the points. If an optional polydata file is provided, the example operates on the points in that polydata.

Question

If you have a question about this example, please use the VTK Discourse Forum

Code

SurfaceFromUnorganizedPoints.cxx

#include <vtkCamera.h>
#include <vtkContourFilter.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkReverseSense.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkSurfaceReconstructionFilter.h>
#include <vtkXMLPolyDataReader.h>

int main(int argc, char* argv[])
{

  vtkNew<vtkNamedColors> colors;

  auto input = vtkSmartPointer<vtkPolyData>::New();
  if (argc > 1)
  {
    vtkNew<vtkXMLPolyDataReader> reader;
    reader->SetFileName(argv[1]);
    reader->Update();
    input = reader->GetOutput();
  }
  if (argc == 1)
  {
    vtkNew<vtkSphereSource> sphereSource;
    sphereSource->Update();
    input = sphereSource->GetOutput();
  }

  vtkNew<vtkPolyData> polydata;
  polydata->SetPoints(input->GetPoints());

  // Construct the surface and create isosurface.
  vtkNew<vtkSurfaceReconstructionFilter> surf;
  surf->SetInputData(polydata);

  vtkNew<vtkContourFilter> cf;
  cf->SetInputConnection(surf->GetOutputPort());
  cf->SetValue(0, 0.0);

  // Sometimes the contouring algorithm can create a volume whose gradient
  // vector and ordering of polygon (using the right hand rule) are
  // inconsistent. vtkReverseSense cures this problem.
  vtkNew<vtkReverseSense> reverse;
  reverse->SetInputConnection(cf->GetOutputPort());
  reverse->ReverseCellsOn();
  reverse->ReverseNormalsOn();

  vtkNew<vtkPolyDataMapper> map;
  map->SetInputConnection(reverse->GetOutputPort());
  map->ScalarVisibilityOff();

  vtkNew<vtkActor> surfaceActor;
  surfaceActor->SetMapper(map);
  surfaceActor->GetProperty()->SetDiffuseColor(
      colors->GetColor3d("Tomato").GetData());
  surfaceActor->GetProperty()->SetSpecularColor(
      colors->GetColor3d("Seashell").GetData());
  surfaceActor->GetProperty()->SetSpecular(.4);
  surfaceActor->GetProperty()->SetSpecularPower(50);

  // Create the RenderWindow, Renderer and both Actors
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetSize(640, 480);

  vtkNew<vtkRenderWindowInteractor> interactor;
  interactor->SetRenderWindow(renderWindow);

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

  renderWindow->SetWindowName("SurfaceFromUnorganizedPoints");
  renderWindow->Render();
  interactor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(SurfaceFromUnorganizedPoints)

find_package(VTK COMPONENTS 
  CommonColor
  CommonCore
  CommonDataModel
  FiltersCore
  FiltersSources
  IOXML
  ImagingHybrid
  InteractionStyle
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "SurfaceFromUnorganizedPoints: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(SurfaceFromUnorganizedPoints MACOSX_BUNDLE SurfaceFromUnorganizedPoints.cxx )
  target_link_libraries(SurfaceFromUnorganizedPoints PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS SurfaceFromUnorganizedPoints
  MODULES ${VTK_LIBRARIES}
)

Download and Build SurfaceFromUnorganizedPoints

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

cd SurfaceFromUnorganizedPoints/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:

./SurfaceFromUnorganizedPoints

WINDOWS USERS

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