Rings

• Ring – a sequentially connected set of edges that bound a face

  • External Ring – defines the outer boundary of a face
    • The outer ring includes any edges contained within the face, but connected to the outer boundary
  • Internal Ring – defines an inner boundary of a face (i.e., a "hole" in the face)
    • A collection of one or more edges that are connected to one another, but which are not connected to the outer boundary of the face, form an inner ring even if they do not enclose an area

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