PK_SURF_extension_t    


typedef int PK_SURF_extension_t;


This data type specifies how a surface is to be extended.  It has values:

    PK_SURF_extension_none_c        No extension requested
    PK_SURF_extension_point_c       Extend to a point.
    PK_SURF_extension_box_c         Extend to a box.
    PK_SURF_extension_uvbox_c       Extend to a uvbox.
    PK_SURF_extension_ratio_c       Extend parameter boundaries by a ratio of
                                    the current parameter range.