PK_blend_setback_shape_data_t

struct PK_blend_setback_shape_data_s
    {
    PK_blend_setback_shape_t
                              default_shape; --- the default configuration of
                                             --- faces in setback vertex blends
                                             ---(PK_blend_setback_collar_all_c)
                                             --- [PF]
    int                       n_vertices;    --- number of vertices at which
                                             --- the blend vertex patch will
                                             --- have a configuration other
                                             --- than the default
                                             --- (0) [NF]
    const PK_VERTEX_t        *vertices;      --- array of vertices at which the
                                             --- blend vertex patch will have a
                                             --- configuration other than the
                                             --- default
                                             --- (NULL) [NF]
    const PK_blend_setback_shape_t
                             *shapes;        --- configurations of blend vertex
                                             --- patches at 'vertices'
                                             --- (NULL) [NF]
    };
typedef struct PK_blend_setback_shape_data_s PK_blend_setback_shape_data_t;


This structure contains information specifying whether or not collar
faces should be added to setback vertex blend patches, and a list
of vertices specifying  where to add them.

Used in:

PK_BODY_fix_blends_o_t

When setback is to be applied at a vertex, the blend may be completed at
the vertex using one of two patch configurations: with or without collars.

See here for more information and illustrations
of the collared and non-collared results.

'default_shape'   This is the vertex blend patch configuration that will
                  be constructed unless otherwise specified.
                  The default is PK_blend_setback_collar_all_c.
                  This option must be set to PK_blend_setback_collar_none_c for
                  facet geometry.

'vertices'        This is an array of length 'n_vertices' specifying on
                  which vertices to use a blend patch configuration
                  other than the default.

'shapes'          This is an array of length 'n_vertices' specifying the
                  blend patch configurations for 'vertices'.