Edge definition

@EDGE_NAME { EdgeName} {
@CONNECTED_TO_VERTEX {Vertex0Name, Vertex1Name}
@CURVE_NAME {CurveName}
@TRIAD_NAME {Triad0Name, Triad1Name}
@COMMENTS {CommentText}


Figure 1. Configuration of an edge.

An edge is a topological entity, see fig 1, which points to two vertices, Vertex0Name and Vertex1Name. Figure 1 shows the configuration of an edge with its two vertices.

In some instances, it will be required to distinguish the order in which the two vertices were defined. Figure 1 shows the names of the vertices as VertexA and VertexB; the labels v0 and v1 indicate the order in which the were defined; in this case, Vertex0Name = VertexA and Vertex1Name = VertexB.


  • Optionally, the edge is associated with geometric components, a curve, CurveName, or one or two triads, Triad0Name, Triad1Name.
  • It is possible to attach comments to the definition of the object; these comments have no effect on its definition.