NOTES

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| NOTES
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* Consider:

  - Exception source: locate first stack frame in input file?
  - Add -Werror=...
    - Useful e.g. with serious mesh warnings (e.g. self-intersections,
      which can occur with numeric operations).

  - Add -Wmesh-operations=...
    - Mesh warning flags, test on all operations results.  As a construction
      progresses, the results of even minor operations tend to be
      complex, so that tens or hundreds of costly tests on very
      similar meshes are necessary.
    - Furthermore most operations should be "safe" so that
      e.g. -Wmesh-operations=deform,fair could be used to check only
      certain "dangerous" operations.
    - Also -Wmesh-operations=pipe,write-stl could be used to test the
      output, so that more expensive tests can be done only when
      necessary.

  - Implement -Wmesh as separate check operations?
    - Take advantage of threading.

  - use BOUNDARY for bounding volumes?
    - e.g. (boundary (bounding-halfspace ...)) -> (bounding-plane ...)
    - similarly for other volumes

  - Minkowski:
    - Glide polylines?
      - Probably yes.  Need only new Polyline operation, like polygon but yielding Nef_3.
    - Minkowski difference?
      - Doable for 2D.  Tricky or impossible in 3D.
      - Sum doesn't work on Nef complement or Nef with hole ("manual complement").

  - Deform:
    - Support different modes and weights?

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| TODO
`----

* Fix loose ends
  - Edge selectors:
    - CGAL::Polygon_mesh_processing::detect_sharp_edges ?
    - by dihedral angle
    - by direction

  - Face selectors:
    - by segmentation

  - fix to/from_scheme for bignums.

* Selection
  - Add regularization (regularize_face_selection_borders).

* Make Write_operation work with Polyhedron.
* Make load/save use binary formats where possible.
  - At least for polyhedra, this should provide a speedup.

* Implement boolean culling.
  - See: https://doc.cgal.org/latest/Box_intersection_d/index.html

* Interesting CGAL functions:
  - tangential_relaxation
  - angle_and_area_smoothing

* Add Measure_operation
  - CGAL::Polygon_mesh_processing:
  - area
  - centroid
  - longest_border
  - volume

* Add solid primitives:
  - Dodecahedron