用sendcommand做剖切问题

linboying

strpnt1 = pt1(0) & "," & pt1(1) & "," & pt1(2)
strpnt2 = pt2(0) & "," & pt2(1) & "," & pt2(2)
strpnt3 = pt3(0) & "," & pt3(1) & "," & pt3(2)
strpnt4 = pt4(0) & "," & pt4(1) & "," & pt4(2)

用strpnt1,strpnt2,strpnt3这三点剖切实体,保留strpnt4点所在的一侧实体,我写的语句如下:Thisdrawing.SendCommand "_slice" & vbCr & "3" & vbCr & strpnt1 & vbCr & strpnt2 & vbCr & strpnt3 & vbCr & strpnt4,可是运行的结果只选择了被剖切的实体(高亮),而未做剖切,不知错在哪里?另,用slicesolid(pt1,pt2,pt3,true/false)做剖切,无法按要求保留需要的实体,请高手门指点!