【求助】关于函数UF_MODL_ask_extrusion（）

ptjmy

使用UF_MODL_ask_extrusion(feature,num_objects,objects,trim_ptr,taper_angle,limits,offset,region_point,region_specified,solid_creation,direction)能判断特征是凸的还是凹的吗？我查了一下document
struct UF_MODL_SWEEP_TRIM_object_s
{
   tag_t *trim_objects,
   int  trim_count,
   UF_MODL_SWEEP_TRIM_SIGN sign,
   tag_t  *thru_bodies,
   int  num_thru_bodies
}莫非根据变量sign?如果是，请问sign分别是多少时，特征是凸的和凹的？