OUGEEF ( ed_fn, parms, curve, cutype, start, st_t, end, end_t, sense, ifail )
=============================================================================
Output geometry of edge or fin
Can be called from the GO.
Receives:
KI_tag_topology *ed_fn --- edge or fin being queried
KI_cod_logical *parms --- request for parameters
Returns:
KI_tag_curve *curve --- tag of curve
KI_cod_tycu *cutype --- type of curve
KI_vec_position start --- start position
KI_dbl *st_t --- parameter of 'start'
KI_vec_position end --- end position
KI_dbl *end_t --- parameter of 'end'
KI_cod_logical *sense --- true if 'curve' is in same
--- direction as 'ed_fn'
KI_cod_error *ifail --- failure code
Specific errors:
KI_missing_geom Insufficient geometry to represent 'ed_fn'
KI_wrong_entity wrong entity
Description:
This function receives an item of topology, 'ed_fn', which may be an edge
or a fin, and returns geometry representing it. The geometry comprises
the tag of a curve, the curve type, position vectors on the curve
corresponding to the end points of the item, and optionally the curve
parameters of these position vectors. Together these represent a bounded
portion of curve corresponding to 'ed_fn'.
The position vectors 'start' and 'end' are returned such that movement
from 'start' to 'end' along the curve is in the same direction as the curve.
If 'sense' is returned as KI_false, then the curve direction is in the
opposite direction to 'ed_fn', though this can only occur for fins and
laminar edges on sheet bodies.
Note that 'curve' is attached to the model and should not be modified
or deleted without due care.
If 'parms' is set to KI_true, the curve parameters corresponding to 'start'
and 'end', ( 'st_t' and 'end_t' respectively ) will be calculated. 'st_t'
will always be smaller than 'end_t', the period of parametrisation being
added to 'end_t' if necessary. If 'parms' is set to KI_false, the parameters
will be arbitrarily returned as zero.
If 'ed_fn' has no curve attached, an attempt will be made to return
equivalent geometry that lies in the same surface. Thus if 'ed_fn' is an
edge, fin geometry may be returned, and vice versa. However if 'ed_fn'
is a fin, the geometry of the other fin will not be returned.
If 'ed_fn' is a ring, 'start' and 'end' will both be returned as the
position vector corresponding to the lowest value in the parameter range
for the curve. 'st_t' will be this lowest parameter value, and 'end_t' this
value plus the period of parameterisation.
Where no geometry representing 'ed_fn' can be found, this will give rise to
ifail KI_missing_geom.
