struct PK_replace_help_points_s
    {
    int                n_topologies; --- number of topologies (0)
    const PK_TOPOL_t  *topologies;   --- topologies needing help points (NULL)
    const PK_VECTOR_t *positions;    --- help point positions (NULL)
    };

typedef struct PK_replace_help_points_s PK_replace_help_points_t;



This structure is part of the PK_FACE_replace_surfs_o_t options
structure. It contains the help point positions to be used to
calculate the new geometries of the specified topologies.
For each topology, its closest geometry solution to its related
help point is prefered to any possible other.
The topologies must be of the same type, all edges or all vertices.


Description of fields:



n_topologies      Number of topologies to help modify. Length of the
                    topologies and positions arrays.
                    The default value is 0.


topologies        Array of the topologies to help modify. All the topologies
                    in this array must be of the same type, edges or vertices.
                    The array default value is NULL.


positions         Array of the user-provided help positions for
                    the specified topologies. The array default value is NULL.