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* The new class vtkExplicitStructuredGrid * Two new filter vtkImageDataToExplicitStructuredGrid and vtkUnstructuredGridExplicitStructuredGrid for converting to the new type * A new filter vtkExplicitStructuredGridToUnstructuredGrid for converting from the new type * A new filter vtkExplicitStructuredGridCrop , as a first filter specific to the new type * A few tests for these filters ``` /* vtkExplicitStructuredGrid is a data object that is a concrete implementation * of vtkDataSet. vtkExplicitStructuredGrid represents a geometric structure * that is a topologically regular array of hexahedron. The topology is that of * a cube that has been subdivided into a regular array of smaller cubes. * Each cell can be addressed with i-j-k indices, however neighbor hexahedrons * does not necessarily share a face and hexahedron can be blanked (turned-off). * * Like unstructured grid, vtkExplicitStructuredGrid has explicit point coordinates * and cell to point indexing. * Unlike unstructured grid, vtkExplicitStructuredGrid does not keep a cell type * list as all cells are known to be hexahedra. * vtkExplicitStructuredGrid can take advantage of its layout to perform operations * based on the i, j, k parameters, similar to structured grid. This makes some * operations faster on this class, without loosing the flexibility of the * cell -> points mapping. * The most common use of this class would be in situations where you have all * hexahedra but the points used by the cells are not exactly defined by the * i, j, k parameters. One example of this is a structured grid with a half voxel * shift occurring in the middle of it such as with a geologic fault. * * The order and number of points is arbitrary. * The order and number of cells must match that specified by the dimensions * of the grid minus 1, because in vtk structured datasets the dimensions * correspond to the points. * The cells order increases in i fastest (from 0 <= i <= dims[0] - 2), * then j (0 <= j <= dims[1] - 2), then k ( 0 <= k <= dims[2] - 2) where dims[] * are the dimensions of the grid in the i-j-k topological directions. * The number of cells is (dims[0] - 1) * (dims[1] - 1) * (dims[2] - 1). */ ```
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