https://forums.autodesk.com/t5/objectarx-forum/acdbpolyline-derived-custom-class-does-not-reply-for/m-p/2033547#M20831 This was due to an optimization for speed with AcDbPolylines in the osnap <BR /> code in AutoCAD. That problem was fixed in AutoCAD 2007 so that the <BR /> optimization only works on true AcDbPolylines not objects of derived <BR /> classes. Unfortunately, that doesn't help you with Acad 2002 and 2006. <BR /> Sorry. <span class="lia-unicode-emoji" title=":disappointed_face:">😞</span><BR /> <BR /> <CLS555> wrote in message news:5675889@discussion.autodesk.com...<BR /> Hello!<BR /> I made a class which is derived from AcDbPolyline.Everything is OK but <BR /> snap intersection point is always fail. So I place a breakpoint in the <BR /> intersectWith() function,and it doesn't work.<BR /> Rarely system can enter intersectWith() ,Trim Break command and object <BR /> trace mode use it.The breakpoint react at<BR /> this time.<BR /> Custom class derived from AcDbCurve does not have this problem,but It is <BR /> hard to change my class.<BR /> In Acad2002,Acad2006.<BR /> Best <BR /> wishes!<BR /> Thank <BR /> you.</CLS555> Wed, 01 Aug 2007 15:12:14 GMT Anonymous 2007-08-01T15:12:14Z https://forums.autodesk.com/t5/objectarx-forum/acdbpolyline-derived-custom-class-does-not-reply-for/m-p/2033546#M20830 Hello!<BR /> I made a class which is derived from AcDbPolyline.Everything is OK but snap intersection point is always fail. So I place a breakpoint in the intersectWith() function,and it doesn't work.<BR /> Rarely system can enter intersectWith() ,Trim Break command and object trace mode use it.The breakpoint react at<BR /> this time.<BR /> Custom class derived from AcDbCurve does not have this problem,but It is hard to change my class.<BR /> In Acad2002,Acad2006.<BR /> Best wishes!<BR /> Thank you. Wed, 01 Aug 2007 07:51:10 GMT https://forums.autodesk.com/t5/objectarx-forum/acdbpolyline-derived-custom-class-does-not-reply-for/m-p/2033546#M20830 Anonymous 2007-08-01T07:51:10Z https://forums.autodesk.com/t5/objectarx-forum/acdbpolyline-derived-custom-class-does-not-reply-for/m-p/2033547#M20831 This was due to an optimization for speed with AcDbPolylines in the osnap <BR /> code in AutoCAD. That problem was fixed in AutoCAD 2007 so that the <BR /> optimization only works on true AcDbPolylines not objects of derived <BR /> classes. Unfortunately, that doesn't help you with Acad 2002 and 2006. <BR /> Sorry. <span class="lia-unicode-emoji" title=":disappointed_face:">😞</span><BR /> <BR /> <CLS555> wrote in message news:5675889@discussion.autodesk.com...<BR /> Hello!<BR /> I made a class which is derived from AcDbPolyline.Everything is OK but <BR /> snap intersection point is always fail. So I place a breakpoint in the <BR /> intersectWith() function,and it doesn't work.<BR /> Rarely system can enter intersectWith() ,Trim Break command and object <BR /> trace mode use it.The breakpoint react at<BR /> this time.<BR /> Custom class derived from AcDbCurve does not have this problem,but It is <BR /> hard to change my class.<BR /> In Acad2002,Acad2006.<BR /> Best <BR /> wishes!<BR /> Thank <BR /> you.</CLS555> Wed, 01 Aug 2007 15:12:14 GMT https://forums.autodesk.com/t5/objectarx-forum/acdbpolyline-derived-custom-class-does-not-reply-for/m-p/2033547#M20831 Anonymous 2007-08-01T15:12:14Z https://forums.autodesk.com/t5/objectarx-forum/acdbpolyline-derived-custom-class-does-not-reply-for/m-p/2033548#M20832 Thank you all the same! Thu, 02 Aug 2007 00:25:52 GMT https://forums.autodesk.com/t5/objectarx-forum/acdbpolyline-derived-custom-class-does-not-reply-for/m-p/2033548#M20832 Anonymous 2007-08-02T00:25:52Z