PK_CURVE_degen_t

struct PK_CURVE_degen_s
    {
    PK_CURVE_degen_type_t type;
    PK_LOGICAL_t          have_position;
    PK_VECTOR_t           position;
    PK_INTERVAL_t         range;
    PK_GEOM_t             geom;
    };

typedef struct PK_CURVE_degen_s PK_CURVE_degen_t;



A structure packaging information about a degeneracy on a curve.

Used in:

PK_CURVE_degens_t

Each structure contains information on a single region where the curve is
degenerate.

The structure has the following fields:

'type'              Indicates the type of degeneracy.

'have_position'     If set to PK_LOGICAL_true, then a three-space position is
                    returned in 'position'.

'position'          If 'have_position' is set to PK_LOGICAL_true, this
                    indicates the position of the degeneracy in three-space.
                    If 'range' is not zero-width, then the position corresponds
                    to the parametric centre.

'range'             The range of the degeneracy in parameter space. Note that
                    it is possible to have zero-width parameter ranges.

'geom'              The geometric node containing the degeneracy. If 'type' is
                    PK_CURVE_degen_type_phys_c or PK_CURVE_degen_type_param_c,
                    this will be the input 'curve'. Otherwise if 'type' is
                    PK_CURVE_degen_type_on_surf_c, this will be the underlying
                    surface containing the degeneracy.