HalfEdge

class compas.datastructures.HalfEdge(name=None, default_vertex_attributes=None, default_edge_attributes=None, default_face_attributes=None)[source]

Bases: Datastructure

Base half-edge data structure for representing the topology of open oor closed surface meshes.

Parameters

• name (str, optional) – The name of the datastructure.

• default_vertex_attributes (dict, optional) – Default values for vertex attributes.

• default_edge_attributes (dict, optional) – Default values for edge attributes.

• default_face_attributes (dict, optional) – Default values for face attributes.

Attributes

• attributes (dict[str, Any]) – General attributes of the data structure that are included in the data representation and serialization.

• default_vertex_attributes (dict[str, Any]) – Dictionary containing default values for the attributes of vertices. It is recommended to add a default to this dictionary using update_default_vertex_attributes() for every vertex attribute used in the data structure.

• default_edge_attributes (dict[str, Any]) – Dictionary containing default values for the attributes of edges. It is recommended to add a default to this dictionary using update_default_edge_attributes() for every edge attribute used in the data structure.

• default_face_attributes (dict[str, Any]) – Dictionary contnaining default values for the attributes of faces. It is recommended to add a default to this dictionary using update_default_face_attributes() for every face attribute used in the data structure.

Methods

add_face	Add a face to the mesh object.
add_vertex	Add a vertex to the mesh object.
clear	Clear all the mesh data.
cull_vertices	Remove all unused vertices from the mesh object.
delete_face	Delete a face from the mesh object.
delete_vertex	Delete a vertex from the mesh and everything that is attached to it.
edge_attribute	Get or set an attribute of an edge.
edge_attributes	Get or set multiple attributes of an edge.
edge_faces	Find the two faces adjacent to an edge.
edge_loop	Find all edges on the same loop as a given edge.
edge_sample	A random sample of the edges.
edge_strip	Find all edges on the same strip as a given edge.
edges	Iterate over the edges of the mesh.
edges_attribute	Get or set an attribute of multiple edges.
edges_attributes	Get or set multiple attributes of multiple edges.
edges_where	Get edges for which a certain condition or set of conditions is true.
edges_where_predicate	Get edges for which a certain condition or set of conditions is true using a lambda function.
euler	Calculate the Euler characteristic.
face_adjacency_halfedge	Find one half-edge over which two faces are adjacent.
face_adjacency_vertices	Find all vertices over which two faces are adjacent.
face_attribute	Get or set an attribute of a face.
face_attributes	Get or set multiple attributes of a face.
face_corners	Return triplets of face vertices forming the corners of the face.
face_degree	Count the neighbors of a face.
face_halfedges	The halfedges of a face.
face_max_degree	Compute the maximum degree of all faces.
face_min_degree	Compute the minimum degree of all faces.
face_neighborhood	Return the faces in the neighborhood of a face.
face_neighbors	Return the neighbors of a face across its edges.
face_sample	A random sample of the faces.
face_vertex_after	Return the n-th vertex after the specified vertex in a specific face.
face_vertex_ancestor	Return the n-th vertex before the specified vertex in a specific face.
face_vertex_before	Return the n-th vertex before the specified vertex in a specific face.
face_vertex_descendant	Return the n-th vertex after the specified vertex in a specific face.
face_vertices	The vertices of a face.
faces	Iterate over the faces of the mesh.
faces_attribute	Get or set an attribute of multiple faces.
faces_attributes	Get or set multiple attributes of multiple faces.
faces_where	Get faces for which a certain condition or set of conditions is true.
faces_where_predicate	Get faces for which a certain condition or set of conditions is true using a lambda function.
genus	Calculate the genus.
get_any_face	Get the identifier of a random face.
get_any_vertex	Get the identifier of a random vertex.
get_any_vertices	Get a list of identifiers of a random set of n vertices.
halfedge_after	Find the halfedge after the given halfedge in the same face.
halfedge_before	Find the halfedge before the given halfedge in the same face.
halfedge_face	Find the face corresponding to a halfedge.
halfedge_loop	Find all edges on the same loop as the halfedge, in the direction of the halfedge.
halfedge_strip	Find all edges on the same strip as a given halfedge.
has_edge	Verify that the mesh contains a specific edge.
has_face	Verify that a face is part of the mesh.
has_halfedge	Verify that a halfedge is part of the mesh.
has_vertex	Verify that a vertex is in the mesh.
index_key	Returns a dictionary that maps the indices of a vertex list to keys in a vertex dictionary.
index_vertex	Returns a dictionary that maps the indices of a vertex list to keys in a vertex dictionary.
is_closed	Verify that the mesh is closed.
is_edge_on_boundary	Verify that an edge is on the boundary.
is_empty	Verify that the mesh is empty.
is_face_on_boundary	Verify that a face is on a boundary.
is_manifold	Verify that the mesh is manifold.
is_orientable	Verify that the mesh is orientable.
is_quadmesh	Verify that the mesh consists of only quads.
is_regular	Verify that the mesh is regular.
is_trimesh	Verify that the mesh consists of only triangles.
is_valid	Verify that the mesh is valid.
is_vertex_connected	Verify that a vertex is connected.
is_vertex_on_boundary	Verify that a vertex is on a boundary.
key_index	Returns a dictionary that maps vertex dictionary keys to the corresponding index in a vertex list or array.
number_of_edges	Count the number of edges in the mesh.
number_of_faces	Count the number of faces in the mesh.
number_of_vertices	Count the number of vertices in the mesh.
remove_unused_vertices	Remove all unused vertices from the mesh object.
summary	Print a summary of the mesh.
unset_edge_attribute	Unset the attribute of an edge.
unset_face_attribute	Unset the attribute of a face.
unset_vertex_attribute	Unset the attribute of a vertex.
update_default_edge_attributes	Update the default edge attributes.
update_default_face_attributes	Update the default face attributes.
update_default_vertex_attributes	Update the default vertex attributes.
vertex_attribute	Get or set an attribute of a vertex.
vertex_attributes	Get or set multiple attributes of a vertex.
vertex_degree	Count the neighbors of a vertex.
vertex_edges	Find all edges connected to a given vertex.
vertex_faces	The faces connected to a vertex.
vertex_index	Returns a dictionary that maps vertex dictionary keys to the corresponding index in a vertex list or array.
vertex_max_degree	Compute the maximum degree of all vertices.
vertex_min_degree	Compute the minimum degree of all vertices.
vertex_neighborhood	Return the vertices in the neighborhood of a vertex.
vertex_neighbors	Return the neighbors of a vertex.
vertex_sample	A random sample of the vertices.
vertices	Iterate over the vertices of the mesh.
vertices_attribute	Get or set an attribute of multiple vertices.
vertices_attributes	Get or set multiple attributes of multiple vertices.
vertices_where	Get vertices for which a certain condition or set of conditions is true.
vertices_where_predicate	Get vertices for which a certain condition or set of conditions is true using a lambda function.

Inherited Methods

ToString	Converts the instance to a string.
copy	Make an independent copy of the data object.
from_data	Construct an object of this type from the provided data.
from_json	Construct an object from serialized data contained in a JSON file.
from_jsonstring	Construct an object from serialized data contained in a JSON string.
sha256	Compute a hash of the data for comparison during version control using the sha256 algorithm.
to_data	Convert an object to its native data representation.
to_json	Serialize the data representation of an object to a JSON file.
to_jsonstring	Serialize the data representation of an object to a JSON string.
validate_data	Validate the object's data against its data schema.
validate_json	Validate the object's data against its json schema.