typedef int PK_render_param_t;


This field can take any one of the following values.
    PK_render_param_no_c        : no parametric hatching (default)
    PK_render_param_attrib_c    : parametric hatch faces which have
                                    parametric hatch attribute
    'PK_render_param_free_c'      : parametric hatch using spec in
                                    PK_TOPOL_render_line_o_t without
                                    locking parametric positions to a
                                    point
    PK_render_param_yes_c       : parametric hatch using spec in
                                    PK_TOPOL_render_line_o_t