PK_blend_vx_blend_data_t

struct PK_blend_vx_blend_data_s
    {
    PK_LOGICAL_t         vertex_blend; --- whether to vertex blend
                                       --- (PK_LOGICAL_false)
    int                  n_vertices;   --- number of vertices (0)
    const PK_VERTEX_t   *vertices;     --- array of vertices to blend (NULL)
    };
typedef struct PK_blend_vx_blend_data_s PK_blend_vx_blend_data_t;




Vertex blending allows users to blend smoothly past sharp edges of opposite
convexity to the blend. This structure contains information specifying
whether or not vertex blending is required, and a list of vertices specifying
where to apply it.

Used in:

PK_BODY_fix_blends_o_t

The structure contains a single switch controlling whether or not vertex
blending is required.

'vertex_blend'    when set to PK_LOGICAL_true switches vertex blending on.
                  If the blends to be fixed are curvature-continuous (i.e.
                  'xs_shape' was set to PK_blend_xs_shape_g2_c when the blend
                  was set), this must be set to PK_LOGICAL_false.
                  The default is PK_LOGICAL_false.

'vertices'        is an array of length 'n_vertices' specifying on
                  which vertices to apply vertex blends.

If vertex blending is switched on and no vertices are supplied all
suitable vertices are blended.

See Blending sharp edges at vertices for more information.