|
|
| (One intermediate revision by one other user not shown) |
| Line 1: |
Line 1: |
| 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| | {{warning|1=The media wiki content on this page is no longer maintained.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">
| |
| ./MeshDecimation sphere.vtk sphere_decimated.vtk N
| |
| </source>
| |
| where N is the number of target triangles.
| |
| | |
| The sample sphere file is [http://www.itk.org/Wiki/images/8/89/Sphere.vtk.zip here]. | |
| | |
| <source lang="cpp">
| |
| #include <iostream>
| |
| #include <string>
| |
| #include <sstream>
| |
| | |
| #include "/home/doriad/src/Insight/Code/Review/itkVTKPolyDataReader.h"
| |
| #include "/home/doriad/src/Insight/Code/Review/itkVTKPolyDataWriter.h"
| |
| #include "itkQuadEdgeMesh.h"
| |
| | |
| #include "itkQuadEdgeMeshDecimationCriteria.h"
| |
| #include "itkQuadEdgeMeshSquaredEdgeLengthDecimation.h"
| |
| | |
| const unsigned int Dimension = 3;
| |
| typedef itk::QuadEdgeMesh< float, Dimension > MeshType;
| |
| | |
| int main( int argc, char ** argv )
| |
| {
| |
| if(argc != 4)
| |
| {
| |
| std:: cout << "Required arguments: InputFilename OutputFilename" << std::endl;
| |
| exit(-1);
| |
| }
| |
|
| |
| std::string InputFilename = argv[1];
| |
| std::cout << "Input file: " << InputFilename << std::endl;
| |
|
| |
| std::string OutputFilename = argv[2];
| |
| std::cout << "Output file: " << OutputFilename << std::endl;
| |
|
| |
| std::string strTriangleCount = argv[3];
| |
| std::stringstream ssTriangleCount;
| |
| ssTriangleCount << strTriangleCount;
| |
| unsigned int TriangleCount;
| |
| ssTriangleCount >> TriangleCount;
| |
|
| |
| typedef itk::VTKPolyDataReader< MeshType > ReaderType;
| |
| | |
| ReaderType::Pointer polyDataReader = ReaderType::New();
| |
| | |
| typedef ReaderType::PointType PointType;
| |
| typedef ReaderType::VectorType VectorType;
| |
| | |
| polyDataReader->SetFileName(InputFilename.c_str());
| |
|
| |
| try
| |
| {
| |
| std::cerr << "Trying to read..." << std::endl;
| |
| polyDataReader->Update();
| |
| }
| |
| catch( itk::ExceptionObject & excp )
| |
| {
| |
| std::cerr << "Error during Update() " << std::endl;
| |
| std::cerr << excp << std::endl;
| |
| return EXIT_FAILURE;
| |
| }
| |
|
| |
| std::cout << "polyDataReader:" << std::endl <<
| |
| polyDataReader << std::endl;
| |
| | |
| MeshType::Pointer mesh = polyDataReader->GetOutput();
| |
| | |
| typedef itk::NumberOfFacesCriterion<MeshType> CriterionType;
| |
| CriterionType::Pointer criterion = CriterionType::New();
| |
| criterion->SetTopologicalChange(false);
| |
| criterion->SetNumberOfElements(TriangleCount);
| |
|
| |
| typedef itk::QuadEdgeMeshSquaredEdgeLengthDecimation<MeshType,MeshType,CriterionType> DecimationType;
| |
|
| |
| DecimationType::Pointer decimate = DecimationType::New();
| |
| decimate->SetInput(mesh);
| |
| decimate->SetCriterion(criterion);
| |
| decimate->SetRelocate(true);
| |
| decimate->Update();
| |
|
| |
| MeshType::Pointer OutputMesh = decimate->GetOutput();
| |
|
| |
| {
| |
| typedef itk::VTKPolyDataWriter< MeshType > WriterType;
| |
| | |
| WriterType::Pointer polyDataWriter = WriterType::New();
| |
| | |
| polyDataWriter->SetFileName(OutputFilename.c_str());
| |
| polyDataWriter->SetInput(OutputMesh);
| |
| polyDataWriter->Update();
| |
| polyDataWriter->Write();
| |
| }
| |
|
| |
| return 0;
| |
| }
| |
| </source>
| |
