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| This example demonstrates how to add points and edges to a mesh.
| | For N-D meshes, use itkMesh. For 2D surfaces embedded in 3D, use itkQuadEdgeMesh (in the Review directory). |
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| <source lang="cpp">
| | [[ITK/InsightClopedia/Meshes/AddPointsAndEdges|Add points and edges to a mesh.]] |
| #include "itkMesh.h"
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| #include "itkLineCell.h"
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| const unsigned int Dimension = 3;
| | [[Mesh Decimation]] |
| typedef itk::Mesh< float, Dimension > MeshType;
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|
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| MeshType::Pointer CreatePointOnlyMesh();
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| void CreateMeshWithEdges();
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| int main(int, char *[])
| | [[Mesh Subdivision]] |
| {
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| //CreatePointOnlyMesh();
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| CreateMeshWithEdges();
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| return 0;
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| }
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| | |
| MeshType::Pointer CreatePointOnlyMesh()
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| {
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| MeshType::Pointer mesh = MeshType::New();
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| | |
| //create points
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| MeshType::PointType p0,p1,p2,p3;
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| p0[0]= -1.0; p0[1]= -1.0; p0[2]= 0.0; // first point ( -1, -1, 0 )
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| p1[0]= 1.0; p1[1]= -1.0; p1[2]= 0.0; // second point ( 1, -1, 0 )
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| p2[0]= 1.0; p2[1]= 1.0; p2[2]= 0.0; // third point ( 1, 1, 0 )
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| p3[0]= 1.0; p3[1]= 1.0; p3[2]= 1.0; // third point ( 1, 1, 1 )
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| | |
| mesh->SetPoint( 0, p0 );
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| mesh->SetPoint( 1, p1 );
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| mesh->SetPoint( 2, p2 );
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| mesh->SetPoint( 3, p3 );
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| std::cout << "Points = " << mesh->GetNumberOfPoints() << std::endl;
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| | |
| //access points
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| typedef MeshType::PointsContainer::Iterator PointsIterator;
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| PointsIterator pointIterator = mesh->GetPoints()->Begin();
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| PointsIterator end = mesh->GetPoints()->End();
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| while( pointIterator != end )
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| {
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| MeshType::PointType p = pointIterator.Value(); // access the point
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| std::cout << p << std::endl; // print the point
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| ++pointIterator; // advance to next point
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| }
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| return mesh;
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| }
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| | |
| void CreateMeshWithEdges()
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| {
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| MeshType::Pointer mesh = CreatePointOnlyMesh();
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|
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| typedef MeshType::CellType::CellAutoPointer CellAutoPointer;
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| typedef itk::LineCell< MeshType::CellType > LineType;
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| //create a link to the previous point in the column (below the current point)
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| CellAutoPointer colline;
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| colline.TakeOwnership( new LineType );
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|
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| //unsigned int pointId0 = 0;
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| //unsigned int pointId1 = 1;
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|
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| unsigned int pointId0 = 2;
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| unsigned int pointId1 = 3;
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|
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| colline->SetPointId(0, pointId0); // line between points 0 and 1
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| colline->SetPointId(1, pointId1);
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| //std::cout << "Linked point: " << MeshIndex << " and " << MeshIndex - 1 << std::endl;
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| mesh->SetCell( 0, colline );
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| | |
| typedef MeshType::CellsContainer::Iterator CellIterator;
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| CellIterator cellIterator = mesh->GetCells()->Begin();
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| CellIterator CellsEnd = mesh->GetCells()->End();
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|
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| while( cellIterator != CellsEnd )
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| {
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| MeshType::CellType * cellptr = cellIterator.Value();
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| LineType * line = dynamic_cast<LineType *>( cellptr );
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|
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| /*
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| typePointIdConstIterator PointIdsBegin (void) const
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| PointIdIterator PointIdsBegin (void)
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| PointIdConstIterator PointIdsEnd (void) const
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| PointIdIterator PointIdsEnd (void)
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| */
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| long unsigned int* linePoint0 = line->PointIdsBegin();
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| //long unsigned int* linePoint1 = line->PointIdsEnd();
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| long unsigned int* linePoint1 = linePoint0+1;
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| std::cout << "line first point id: " << *linePoint0 << std::endl;
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| std::cout << "line second point id: " << *linePoint1 << std::endl;
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| ++cellIterator;
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| }
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|
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| }
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| </source>
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