Topology & Scatter-Gather

The topology module in iskra ✨ allows you to extract topology defined in a mesh.

iskra.topology

assemble_incidence_matrix(n_faces, ...[, signed])	Assembles face-subface relationships into a matrix.
boundary(faces)	Finds all boundary subfaces of a mesh.
connected_components(n_vertices, faces)	Finds the connected components of a mesh.
edge_flaps(faces)	Returns a tensor denoting the right and left faces of an edge.
face_index(data, faces[, squeeze])	Gathers subface values onto the faces that contain them.
face_to_subface_idcs(face_dim[, subface_dim])	Returns canonical indices for subfaces within faces.
find_cliques(edges, max_d)	Finds all cliques in a graph for all sizes up to max_d.
get_subfaces(faces[, subface_dim])	Finds all subface_dim-dimensional subfaces contained in a set of faces.
get_vert_vert(faces)	Vertex-vertex adjacencies.
incidence_matrix(faces[, subface_dim, signed])	Constructs the face-subface incidence matrix.
ordered_boundary_edges(edges)	Orders boundary edges into contiguous loops.
ordered_boundary_vertices(edges)	Orders boundary vertices into contiguous loops.
reduce_on_subface(data, faces, n_subfaces, ...)	Scatter-reduce data from faces onto constitutive subfaces.
scatter_edge_to_vert_vert(values)	Scatters scalar edge data to vertex-vertex data.
simplex_parity(faces)	Parity of each simplex's vertex ordering relative to sorted order.
vertex_adjacency_matrix(n_vertices, faces)	Undirected vertex-vertex adjacency matrix.