[求助]：如何用intersectWith求AcDb3dPolyline与AcDbPolyline的交点？

yusongrong

如何用intersectWith求AcDb3dPolyline线与AcDbPolyline线的交点？
下面的代码只能对AcDbPolyline线与AcDbPolyline线的交点：
ads_name ename;
AcDbObjectId id1,id2;
ads_point p1;
AcDbEntity *pE1,*pE2;
AcGePlane plane;
AcDb::Planarity flag;
if(ads_entsel("\nÑ¡Ôñ:",ename,p1)!=RTNORM)  return ;
acdbGetObjectId(id1, ename);
if(ads_entsel("\nÑ¡Ôñ:",ename,p1)!=RTNORM)  return ;
acdbGetObjectId(id2, ename);
AcGePoint3dArray aa;
if(acdbOpenObject(pE1,id1,AcDb::kForRead)!=Acad::eOk) return ;
if(acdbOpenObject(pE2,id2,AcDb::kForRead)!=Acad::eOk){
  pE1->close();
  return ;
  }
pE1->getPlane(plane,flag);
if(pE1->intersectWith(pE2,AcDb::kOnBothOperands,plane,aa)!=Acad::eOk) return ;
pE1->close();
pE2->close();
if(aa.length()<=0) return;
ads_printf("\nx=%lf y=%lf",aa[0].x,aa[0].y);
郁闷啊？

小树袋熊

AcDb3dPolyline 与 AcDbPolyline 都是从 AcDbEntity  继承而来，怎么不能求呢？