NXcg_half_edge_data_structure¶
Status:
base class, extends NXobject
Description:
Computational geeometry description of a half-edge data structure.
Such a data structure can be used to efficiently circulate around faces and iterate over vertices of a planar graph.
Symbols:
The symbols used in the schema to specify e.g. dimensions of arrays.
d: The dimensionality, which has to be at least 2.
n_v: The number of vertices.
n_f: The number of faces.
n_he: The number of half-edges.
- Groups cited:
none
Structure:
dimensionality: (optional) NX_POSINT {units=NX_UNITLESS}
number_of_vertices: (optional) NX_POSINT {units=NX_UNITLESS}
number_of_faces: (optional) NX_POSINT {units=NX_UNITLESS}
number_of_half_edges: (optional) NX_POSINT {units=NX_UNITLESS}
vertex_identifier_offset: (optional) NX_INT {units=NX_UNITLESS}
In this half-edge data structure vertex identifiers start at 1. Vertices are identified with consecutive integers up to number_of_vertices. This field can be used to document which constant integer has to be added to another set of vertex_identifier to assure that these other identifiers also start at 1.
face_identifier_offset: (optional) NX_INT {units=NX_UNITLESS}
In this half-edge data structure face identifiers start at 1. Faces are identified with consecutive integers up to number_of_faces. This field can be used to document which constant integer has to be added to another set of face_identifier to assure that these other identifiers also start at 1.
The face identifier zero is reserved for the NULL face !
half_edge_identifier_offset: (optional) NX_INT {units=NX_UNITLESS}
In this half-edge data structure half-edge identifiers start at 1. Half-edges are identified with consecutive integers up to number_of_half_edges. This field can be used to document which constant integer has to be added to another set of half_edge_identifier to assure that these other identifiers also start at 1.
position: (optional) NX_NUMBER (Rank: 2, Dimensions: [n_v, d]) {units=NX_LENGTH}
The position of the vertices.
vertex_incident_half_edge: (optional) NX_UINT (Rank: 1, Dimensions: [n_v]) {units=NX_UNITLESS}
Identifier of the incident half-edge.
face_half_edge: (optional) NX_UINT (Rank: 1, Dimensions: [n_f]) {units=NX_UNITLESS}
Identifier of the (starting)/associated half-edge of the face.
half_edge_vertex_origin: (optional) NX_UINT (Rank: 1, Dimensions: [n_he]) {units=NX_UNITLESS}
The identifier of the vertex from which this half-edge is outwards pointing.
half_edge_twin: (optional) NX_UINT (Rank: 1, Dimensions: [n_he]) {units=NX_UNITLESS}
Identifier of the associated oppositely pointing half-edge.
half_edge_incident_face: (optional) NX_UINT (Rank: 1, Dimensions: [n_he]) {units=NX_UNITLESS}
If the half-edge is a boundary half-edge the incident face identifier is NULL, i.e. 0.
half_edge_next: (optional) NX_UINT (Rank: 1, Dimensions: [n_he]) {units=NX_UNITLESS}
Identifier of the next half-edge.
half_edge_prev: (optional) NX_UINT (Rank: 1, Dimensions: [n_he]) {units=NX_UNITLESS}
Identifier of the previous half-edge.
weinberg_vector: (optional) NX_CHAR
Users are referred to the literature for the background of L. Weinberg’s work about topological characterization of planar graphs:
and how this work can e.g. be applied in space-filling tessellations of microstructural objects like crystals/grains.
Hypertext Anchors¶
List of hypertext anchors for all groups, fields, attributes, and links defined in this class.
/NXcg_half_edge_data_structure/half_edge_identifier_offset-field
/NXcg_half_edge_data_structure/half_edge_incident_face-field
/NXcg_half_edge_data_structure/half_edge_vertex_origin-field
/NXcg_half_edge_data_structure/vertex_identifier_offset-field
/NXcg_half_edge_data_structure/vertex_incident_half_edge-field
