Difference between revisions of "VTK/Examples/Cxx/PolyData/CleanPolyData"

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</source>
 
</source>
  
{{VTKCMakeLists|CleanPolyData}}
+
{{VTKCMakeLists|{{SUBPAGENAME}}}}
  
 
Show the normals - this will show that there is more than one normal at each point before, and exactly one after.
 
Show the normals - this will show that there is more than one normal at each point before, and exactly one after.
 
[[Category:VTKAddVisualization]]
 
[[Category:VTKAddVisualization]]

Revision as of 16:11, 20 January 2013

When a cube is created, it has 24 vertices (4 for each face). This is done because the normal at each face is very different. Often we would want a cube to only have 8 vertices. The vtkCleanPolyData filter removes coincident points, resulting in the cube we would expect.

CleanPolyData.cxx

#include <vtkSmartPointer.h>
#include <vtkCubeSource.h>
#include <vtkPolyData.h>
#include <vtkCleanPolyData.h>

int main(int, char *[])
{
  vtkSmartPointer<vtkCubeSource> cubeSource = 
    vtkSmartPointer<vtkCubeSource>::New();
  cubeSource->Update();
  
  std::cout << "Input cube has " << cubeSource->GetOutput()->GetNumberOfPoints() 
    << " vertices." << std::endl;
    
  vtkSmartPointer<vtkCleanPolyData> cleanPolyData = 
      vtkSmartPointer<vtkCleanPolyData>::New();
  cleanPolyData->SetInputConnection(cubeSource->GetOutputPort());
  cleanPolyData->Update();
  
  std::cout << "Cleaned cube has " << cleanPolyData->GetOutput()->GetNumberOfPoints() 
    << " vertices." << std::endl;
  
  return EXIT_SUCCESS;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(CleanPolyData)

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

add_executable(CleanPolyData MACOSX_BUNDLE CleanPolyData.cxx)

if(VTK_LIBRARIES)
  target_link_libraries(CleanPolyData ${VTK_LIBRARIES})
else()
  target_link_libraries(CleanPolyData vtkHybrid vtkWidgets)
endif()

Download and Build CleanPolyData

Click here to download CleanPolyData. and its CMakeLists.txt file.

Once the tarball CleanPolyData.tar has been downloaded and extracted,

cd CleanPolyData/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:

./CleanPolyData

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

Show the normals - this will show that there is more than one normal at each point before, and exactly one after.