PK_blend_rib_control_t

struct PK_blend_rib_control_s
    {
    PK_blend_output_rib_t output_rib;       --- whether and how ribs are made
                                            --- (PK_blend_output_rib_no_c)
    PK_blend_group_rib_t  group_rib;        --- how to group ribs
                                            --- (PK_blend_group_rib_no_c)
    int                   max_n_ribs;       --- limit ribs made per group (0)
    int                   n_interval_parms; --- number of parameters (0)
    double               *interval_parms;   --- parameters dividing the spine
                                            --- into intervals (NULL)
    };
typedef struct PK_blend_rib_control_s PK_blend_rib_control_t;




This structure controls how blend ribs are output.

Used in:

PK_FACE_make_blend_o_t

                    Blend Rib Controls.

 'output_rib'       Control how ribs are produced.
                    This token controls under what circumstances face-face
                    blending will produce ribs.  The default is to not
                    output ribs.

 'group_rib'        Control how to group the ribs produced.
                    Grouping controls how the limit on the number of ribs
                    is applied.  This token defines whether the ribs are
                    grouped by blend face, or by the intervals along the
                    'parameter' curve defined by 'interval_parms',
                    or not at all (default).

 'max_n_ribs'       Limit on number of ribs produced per group.
                    The number of ribs produced in each group will be no
                    greater than this number. The default value is zero,
                    for which no ribs will be produced.

 'n_interval_parms' Number of 'interval_parms' supplied.
                    Default is zero.

 'interval_parms'   Interval parameters.
                    These are used to divide the 'parameter' curve into
                    intervals for grouping ribs.  They should have values
                    in the parameter range of the curve.

If 'output_rib' is not set to PK_blend_output_rib_no_c or to
PK_blend_output_rib_at_help_c then a curve must be supplied in the `
parameter' field of the 'shape' structure.
If 'output_rib' is set to PK_blend_output_rib_at_help_c then 'group_rib'
must be set to PK_blend_group_rib_no_c, 'n_interval_parms' to zero and
'interval_parms' to null. The help point at which the rib is evaluated
is that in the 'help_point' field of the PK_FACE_make_blend_o_t structure
containing the PK_blend_rib_control_t structure.

If 'group_rib' is set to PK_blend_group_rib_by_parms_c and 'n_interval_parms'
is zero, or either zero or one for closed blends, then the effect of
'max_n_ribs' will be identical to having no grouping.
If 'group_rib' is set to another value the 'interval_parms' will have
no effect.

If a user-supplied partition has been specified via the 'partition' field of
a PK_FACE_make_blend_o_t option structure any resulting ribs will be placed
in that partition.

For further details on the use of these options please refer to the Face-Face
Blending Chapter of the Parasolid Functional Description.