• Mathieu Westphal's avatar
    Adds a new vtk dataType vtkExplicitStructuredGrid and related filters: · 8af35b88
    Mathieu Westphal authored
    * 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).
     */
    
    ```
    8af35b88
CMakeLists.txt 838 Bytes