PK_bound_def_t

struct PK_bound_def_s
    {
    PK_bound_t        bound;        --- method of defining bound
    PK_LOGICAL_t      forward;      --- whether bound in positive sense of path
    double            distance;     --- extrusion distance
    PK_ENTITY_t       entity;       --- bounding entity
    PK_LOGICAL_t      nearest;      --- whether divisions are numbered from
                                    --- nearest to or furthest from the
                                    --- profile
    int               nth_division; --- select nth division
    PK_bound_side_t   side;         --- which side is the first division if
                                    --- the bound divides the profile
    };
typedef struct PK_bound_def_s PK_bound_def_t;



This structure describes how an extruded body or feature is bound in one
direction.

Used in:

PK_BODY_extrude_o_t

It has the following fields:

'bound'        method used for defining this bound.  See the documentation
               for PK_bound_t.

'forward'      whether the bound is on the side of the given 'profile'
               in the direction of the given 'path' vector, or on the other
               side.

'distance'     distance to bound when 'bound' is PK_bound_distance_c.
               This must be greater than or equal to zero.
               To extrude in the opposite direction to the 'path'
               vector, 'forward' is set to PK_LOGICAL_false.

'entity'       a bounding entity.  This may be a body, face or surface
               depending upon 'bound'.

'nearest'      if PK_LOGICAL_true then divisions are numbered starting
               from one and increasing in the direction moving away from
               the profile.  If 'nearest' is set to PK_LOGICAL_false then
               the first division is that furthest from the 'profile' and
               division numbers increase towards the 'profile'.

'nth_division' when 'bound' is one of: PK_bound_surf_c, PK_bound_face_c,
               PK_bound_body_c or PK_bound_sheet_c then 'nth_division' may be
               set to select a particular division.

'side'         which side of the bounding entity intersecting the profile
               is to count as the first division.  This can only be one of
               PK_bound_side_out_c or PK_bound_side_in_c when: 'bound' is
               PK_bound_body_c or PK_bound_face_c, 'entity' is solid
               and for the first and nearest division.