ITK/Examples/Meshes/QuadEdgeMeshNormalFilter: Difference between revisions

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This example reads a mesh from a vtk file. It then compute normals for the mesh.
{{warning|1=The media wiki content on this page is no longer maintained. The examples presented on the https://itk.org/Wiki/*  pages likely require ITK version 4.13 or earlier releases.  In many cases, the examples on this page no longer conform to the best practices for modern ITK versions.
}}


The sample sphere file is [http://www.itk.org/Wiki/images/8/89/Sphere.vtk.zip here].
[https://itk.org/ITKExamples[ITK Sphinx Examples]]
 
==QuadEdgeMeshNormalFilter.cxx==
<source lang="cpp">
#include "itkVector.h"
#include "itkQuadEdgeMesh.h"
#include "itkVTKPolyDataReader.h"
 
#include "itkQuadEdgeMeshExtendedTraits.h"
#include "itkQuadEdgeMeshNormalFilter.h"
#include <stdlib.h>
 
int main( int argc, char* argv[] )
{
  if( argc < 2 )
    {
    std::cout <<"This program requires at least 1 argument" <<std::endl;
    std::cout <<"1- Input filename" <<std::endl;
    std::cout <<"2- Weight type" <<std::endl;
    std::cout <<"  * 0:  GOURAUD" <<std::endl;
    std::cout <<"  * 1:  THURMER" <<std::endl;
    std::cout <<"  * 2:  AREA" <<std::endl;
    return EXIT_FAILURE;
    }
 
  const unsigned int    Dimension = 3;
  typedef double        CoordType;
 
  typedef itk::QuadEdgeMesh< CoordType, Dimension > InputMeshType;
 
  typedef itk::Vector< CoordType, Dimension > VectorType;
 
  typedef itk::QuadEdgeMeshExtendedTraits <
    VectorType,
    Dimension,
    2,
    CoordType,
    CoordType,
    VectorType,
    bool,
    bool > Traits;
 
  typedef itk::QuadEdgeMesh < VectorType, Dimension, Traits > OutputMeshType;
 
  typedef itk::VTKPolyDataReader< InputMeshType > ReaderType;
  typedef itk::QuadEdgeMeshNormalFilter< InputMeshType, OutputMeshType > NormalFilterType;
  NormalFilterType::WeightType weight_type;
 
  int param = atoi( argv[2] );
 
  if( ( param < 0 ) || ( param > 2 ) )
    {
    std::cout <<"Weight type must be either: " <<std::endl;
    std::cout <<"  * 0:  GOURAUD" <<std::endl;
    std::cout <<"  * 1:  THURMER" <<std::endl;
    std::cout <<"  * 2:  AREA" <<std::endl;
    return EXIT_FAILURE;
    }
  else
    {
    switch( param )
      {
      default:
      case 0:
        weight_type = NormalFilterType::GOURAUD;
        break;
      case 1:
        weight_type = NormalFilterType::THURMER;
        break;
      case 2:
        weight_type = NormalFilterType::AREA;
        break;
      }
    }
 
  ReaderType::Pointer reader = ReaderType::New( );
  reader->SetFileName( argv[1] );
 
  try
    {
    reader->Update( );
    }
  catch( itk::ExceptionObject & excp )
    {
    std::cerr << "Exception thrown while reading the input file " << std::endl;
    std::cerr << excp << std::endl;
    return EXIT_FAILURE;
    }
 
  InputMeshType::Pointer mesh = reader->GetOutput( );
 
  NormalFilterType::Pointer normals = NormalFilterType::New( );
  normals->SetInput( mesh );
  normals->SetWeight( weight_type );
 
  try
    {
    normals->Update( );
    }
  catch( itk::ExceptionObject & excp )
    {
    std::cerr << excp << std::endl;
    return EXIT_FAILURE;
    }
 
  OutputMeshType::Pointer output = normals->GetOutput( );
 
  std::cout << normals << std::endl;
 
  return EXIT_SUCCESS;
}
</source>
 
==CMakeLists.txt==
<source lang="cmake">
 
</source>

Latest revision as of 20:38, 31 May 2019

Warning: The media wiki content on this page is no longer maintained. The examples presented on the https://itk.org/Wiki/* pages likely require ITK version 4.13 or earlier releases. In many cases, the examples on this page no longer conform to the best practices for modern ITK versions.

[ITK Sphinx Examples]