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History of FOLD Specifications

Version 1 = 1.0

  • Initial public draft

Version 1.1

  • Rename edges_foldAngles → edges_foldAngle and edges_lengths → edges_length for consistent pluralization with the rest of the spec.

Version 1.2

  • Add join edge ("J") option to edges_assignment.
  • Add cut/slit edge ("C") option to edges_assignment (optional).
  • Add joins/noJoins and cuts/noCuts to frame_attributes.
  • Add convexFaces/nonconvexFaces to frame_attributes.
  • Define vertices_edges and faces_faces.
  • Extend definition of vertices_faces, edges_faces, and faces_faces to allow null values, allowing for consistent ordering of all arrays and consistent orientation.
  • Specify correspondence between "faces" and "material", to clarify that the exterior (unbounded) face of a planar graph is not typically a face.
  • Clarify that support for multiple frames is optional.