PK_FACE_euler_unslit

PK_ERROR_code_t PK_FACE_euler_unslit
(
--- received arguments ---
PK_FACE_t       face,       --- Face to be unslit
PK_EDGE_t       surviving   --- Edge to survive the unslit
)


This function replaces a 2-edge face with an edge.


Specific Errors:
    PK_ERROR_invalid_face         wrong number of loops or edges on 'face'
    PK_ERROR_bad_edge             'surviving' not on 'face'
    PK_ERROR_edge_not_manifold    'surviving' is not manifold or the other
                                  edge is neither manifold nor laminar


This function deletes a slit face.  'face' must have either one loop
and two edges or two loops each with one ring edge.

'surviving' must be manifold and the other edge of the face must be either
manifold or laminar.  The edges need not have the same direction.

The 'surviving' edge will be retained and the other edge will be deleted.

If face or the edge to be deleted have geometry attached then this will be
deleted.

Any curves attached to fins of the loop of 'face' will be deleted.  If
the other edge is tolerant then the other fin curve of this edge will be
attached as a fin curve to 'surviving'.

The resulting body will normally be invalid.

The inverse to this function is PK_EDGE_euler_slit.

See here for an illustration.