template<typename TInputIdType, typename TFaceIdType>
class vtkStaticFaceHashLinksTemplate< TInputIdType, TFaceIdType >
Templated on types of ids defining an edge.
templated hashLinks for extracting faces from a vtkUnstructuredGrid
vtkStaticFaceHashLinksTemplate is a templated class for grouping faces of an unstructured grid. The faces are grouped by their hash value. Their hash value is the minimum of the ids of the points defining the face of a 3D cells, or the the number of points of the unstructured grid if the cell is a 1D-2D.
To use this class first you need to call BuildHashLinks() with the vtkUnstructuredGrid as argument. Then you can use the methods 1) GetNumberOfFaces() to get the number of faces in the grid 2) GetNumberOfHashes() to get the number of hashes 4) GetNumberOfFacesInHash() to get the number of faces in a particular hash 5) GetCellIdOfFacesInHash() to get the cell id of the faces in a particular hash 6) GetFaceIdOfFacesInHash() to get the face id of the faces in a particular hash
In general, this class tries to minimize the memory usage as much as possible. For that reason while to get a face you need to cell id and the face id, so they could be a struct, it's more efficient to store them in two different arrays to minimize the memory usage.
Template parameters: 1) TInputIdType: the type of the id of the cells and points of the input grid. If Number of points and number of cells Cells < 2^31 then use vtkTypeInt32. Otherwise, use vtkTypeInt64. 2) TFaceIdType: the type of the id of the faces of the input grid. Most of the times a cell can have less than 2^7 faces, so use vtkTypeInt8. Otherwise, use vtkTypeInt32 when the input grid has polyhedron cells.
- Warning
- This class handles only linear cells.
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This class has been threaded with vtkSMPTools. Using TBB or other non-sequential type (set in the CMake variable VTK_SMP_IMPLEMENTATION_TYPE) may improve performance significantly.
- See also
- vtkStaticEdgeLocatorTemplate, vtkStaticCellLinksTemplate
Definition at line 63 of file vtkStaticFaceHashLinksTemplate.h.
1.13.2