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| This example reads a sphere from a vtk file. It then decimates the mesh, attempting to get to a target number of triangles, N. It should be run with
| | {{warning|1=The media wiki content on this page is no longer maintained.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.}} |
| <source lang="text">
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| ./MeshDecimation sphere.vtk sphere_decimated.vtk N
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| </source>
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| where N is the number of target triangles.
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| The sample sphere file is [http://www.itk.org/Wiki/images/8/89/Sphere.vtk.zip here]. | |
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| <source lang="cpp">
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| #include <iostream>
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| #include <string>
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| #include <sstream>
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| #include "/home/doriad/src/Insight/Code/Review/itkVTKPolyDataReader.h"
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| #include "/home/doriad/src/Insight/Code/Review/itkVTKPolyDataWriter.h"
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| #include "itkQuadEdgeMesh.h"
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| #include "itkQuadEdgeMeshDecimationCriteria.h"
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| #include "itkQuadEdgeMeshSquaredEdgeLengthDecimation.h"
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| const unsigned int Dimension = 3;
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| typedef itk::QuadEdgeMesh< float, Dimension > MeshType;
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| int main( int argc, char ** argv )
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| {
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| if(argc != 4)
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| {
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| std:: cout << "Required arguments: InputFilename OutputFilename" << std::endl;
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| exit(-1);
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| }
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|
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| std::string InputFilename = argv[1];
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| std::cout << "Input file: " << InputFilename << std::endl;
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|
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| std::string OutputFilename = argv[2];
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| std::cout << "Output file: " << OutputFilename << std::endl;
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|
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| std::string strTriangleCount = argv[3];
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| std::stringstream ssTriangleCount;
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| ssTriangleCount << strTriangleCount;
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| unsigned int TriangleCount;
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| ssTriangleCount >> TriangleCount;
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|
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| typedef itk::VTKPolyDataReader< MeshType > ReaderType;
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| ReaderType::Pointer polyDataReader = ReaderType::New();
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| typedef ReaderType::PointType PointType;
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| typedef ReaderType::VectorType VectorType;
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| polyDataReader->SetFileName(InputFilename.c_str());
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|
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| try
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| {
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| std::cerr << "Trying to read..." << std::endl;
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| polyDataReader->Update();
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| }
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| catch( itk::ExceptionObject & excp )
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| {
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| std::cerr << "Error during Update() " << std::endl;
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| std::cerr << excp << std::endl;
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| return EXIT_FAILURE;
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| }
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|
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| std::cout << "polyDataReader:" << std::endl <<
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| polyDataReader << std::endl;
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| MeshType::Pointer mesh = polyDataReader->GetOutput();
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| typedef itk::NumberOfFacesCriterion<MeshType> CriterionType;
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| CriterionType::Pointer criterion = CriterionType::New();
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| criterion->SetTopologicalChange(false);
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| criterion->SetNumberOfElements(TriangleCount);
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|
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| typedef itk::QuadEdgeMeshSquaredEdgeLengthDecimation<MeshType,MeshType,CriterionType> DecimationType;
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|
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| DecimationType::Pointer decimate = DecimationType::New();
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| decimate->SetInput(mesh);
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| decimate->SetCriterion(criterion);
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| decimate->SetRelocate(true);
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| decimate->Update();
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|
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| MeshType::Pointer OutputMesh = decimate->GetOutput();
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|
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| {
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| typedef itk::VTKPolyDataWriter< MeshType > WriterType;
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| WriterType::Pointer polyDataWriter = WriterType::New();
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| polyDataWriter->SetFileName(OutputFilename.c_str());
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| polyDataWriter->SetInput(OutputMesh);
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| polyDataWriter->Update();
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| polyDataWriter->Write();
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| }
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|
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| return 0;
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| }
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| </source>
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