PK_EDGE_set_blend_variable_o_t

struct PK_EDGE_set_blend_variable_o_s
    {
    int                    o_t_version;  --- version number of option structure
    PK_blend_properties_t  properties;   --- properties of blend
                                         --- (PK_blend_properties_t)
    PK_blend_rho_t         rho_type;     --- whether to use absolute,
                                         --- relative or centre rho
                                         --- (PK_blend_rho_absolute_c)
    PK_blend_xs_shape_t    xs_shape;     --- cross section shape
                                         --- (PK_blend_xs_shape_conic_c)
    };

typedef struct PK_EDGE_set_blend_variable_o_s PK_EDGE_set_blend_variable_o_t;



Holds optional controls for setting a variable radius blend.

Used in:

PK_EDGE_set_blend_variable

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

Description of fields:

    'properties'
        Properties of the blend.

    'rho_type'
        This option controls how 'rhos' in PK_blend_edge_shape_t is handled
        when creating conic shaped blends.
        If 'rho_type' is set to PK_blend_rho_absolute_c, 'rhos' are
        independent of the angle subtended by the blend.
        If 'rho_type' is set to PK_blend_rho_relative_c, 'rhos'
        are relative to the angle subtended by the blend. For example, a
        relative rho value of 0.5 will produce a circular or least tension
        elliptical conic, while an absolute rho value of 0.5 will produce a
        parabolic conic.
        If 'rho_type' is set to PK_blend_rho_centre_c, the 'rhos' are
        the radii of curvature at the centre of the conic blend cross-section.

    '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 or conic 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. 'rho_type' must be set to its default value
            (PK_blend_rho_absolute_c).