PK_EDGE_set_blend_constant_o_t

struct PK_EDGE_set_blend_constant_o_s
    {
    int                    o_t_version;  --- version number of option structure
    PK_EDGE_t              cliff_edge;   --- top of cliff (PK_ENTITY_null) [NF]
    PK_blend_properties_t  properties;   --- properties of blend
                                         --- (PK_blend_properties_t) [PF]
    PK_blend_xs_shape_t    xs_shape;     --- cross section shape
                                         --- (PK_blend_xs_shape_conic_c) [NF]
    };

typedef struct PK_EDGE_set_blend_constant_o_s PK_EDGE_set_blend_constant_o_t;



Holds optional controls for setting a constant radius blend.


Specific Errors:
    PK_ERROR_illegal_cliff      attempted to specify a 'cliff_edge' in
                                conjunction with a curvature-continuous
                                blend (i.e., 'xs_shape' set to
                                PK_blend_xs_shape_g2_c).
                                (MILD)

Used in:

PK_EDGE_set_blend_constant

The option structure defines options applicable to setting a constant radius
blend.

Description of fields:

    'cliff_edge'
        Tag of edge at cliff top.
        Creates a blend tangent to the face adjacent to the blended edge
        and touching the edge at the 'top' of the cliff. This option is
        only allowed when 'n_edges' = 1.
        Note that an unfixed cliffedge blend will be invalidated if stored
        between sessions.

    'properties'
        Properties of the blend.
        Note that some fields of 'properties' must be set to specific values
        for facet geometry.

    'xs_shape'
        This option controls the cross-sectional shape of the blend.
        It may be set to PK_blend_xs_shape_conic_c for a standard rolling-
        ball blend with a circular cross-section, or PK_blend_xs_shape_g2_c
        for a curvature-continuous cross-section.
        Note: when setting this option to PK_blend_xs_shape_g2_c,
         1. 'properties' must be set, with its fields
                'ov_cliff'      set to  PK_blend_ov_cliff_no_c,
                'ov_cliff_end'  set to  PK_blend_ov_cliff_end_no_c;
         2. 'cliff_edge' must be set to PK_ENTITY_null.