neighbors

ExplicitStructuredGrid.neighbors(ind, rel='connectivity') → list

Return the indices of neighboring cells.

Parameters:

indint or iterable(int)

Cell IDs.

relstr, optional

Defines the neighborhood relationship. If 'topological', returns the (i-1, j, k), (i+1, j, k), (i, j-1, k), (i, j+1, k), (i, j, k-1) and (i, j, k+1) cells. If 'connectivity' (default), returns only the topological neighbors considering faces connectivity. If 'geometric', returns the cells in the (i-1, j), (i+1, j), (i,j-1) and (i, j+1) vertical cell groups whose faces intersect.

Returns:

list(int)

Indices of neighboring cells.

Examples

>>> import pyvista as pv
>>> from pyvista import examples
>>> grid = examples.load_explicit_structured()  
>>> cell = grid.extract_cells(31)  
>>> ind = grid.neighbors(31)  
>>> neighbors = grid.extract_cells(ind)  
>>>
>>> plotter = pv.Plotter()
>>> plotter.add_axes()  
>>> plotter.add_mesh(cell, color='r', show_edges=True)  
>>> plotter.add_mesh(neighbors, color='w', show_edges=True)  
>>> plotter.show()