Lofting problem
Printed From: CAD Forum
Category: EN
Forum Name: AutoCAD
Forum Description: Discussion about AutoCAD and AutoCAD LT, viewers, DWG and DXF formats, Design Review, AutoCAD web, Drive, add-ons
URL: https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10659
Printed Date: 05.Sep.2026 at 09:57
Topic: Lofting problem
Posted By: Mali Zeleni
Subject: Lofting problem
Date Posted: 06.Sep.2014 at 16:36
|
I prepared closed profiles for lofting, but I encountered a problem. Can somebody tell what could be the problem? Here are some picture illustrating the problem:  Profiles in red denote the place of irregularity in the lofted 3D solid.    Thank you for any help. ------------- Kind regards, Hrvoje |
Replies:
Posted By: John Connor
Date Posted: 06.Sep.2014 at 18:16
|
A copy of the drawing would be needed to troubleshoot the problem. ------------- "Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>> |
Posted By: Mali Zeleni
Date Posted: 06.Sep.2014 at 19:57
|
Thank you John for your answer. Here is the file with the drawing: uploads/497931/VL_za_krmenu_protustatvu_-_2.dwg" rel="nofollow - uploads/497931/VL_za_krmenu_protustatvu_-_2.dwg In the meantime I found out that the closed profiles are not of the same type. There are polylines (green), splines (yellow) and 3D polylines (blue).  In the next step I added one profile on the place where the solid has discontinuity in the form. The first blue line, lower. Also, I started to loft from the top (!?) and the form was better. On two places I have the irregularity in the surface. I don't know yet, how to solve this problem.   ------------- Kind regards, Hrvoje |
Posted By: Mali Zeleni
Date Posted: 06.Sep.2014 at 21:02
 If I avoid critical part of the solid it looks fine.  Now must find the way how to close the gaps. ------------- Kind regards, Hrvoje |
Posted By: John Connor
Date Posted: 06.Sep.2014 at 22:18
|
I guess you aren't going to upload a copy of the drawing. OK. Good luck. ------------- "Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>> |
Posted By: Mali Zeleni
Date Posted: 06.Sep.2014 at 22:19
|
If I use each third profile solid looks much better. Also the geometry is not accurate as it can be. ------------- Kind regards, Hrvoje |
Posted By: Mali Zeleni
Date Posted: 06.Sep.2014 at 22:21
P.S. I checked: it is possible to open the drawing. ------------- Kind regards, Hrvoje |
John Connor wrote:Posted By: Mali Zeleni
Date Posted: 07.Sep.2014 at 21:43
I refined the geometry and the 3D solid looks better.  I still have two places on the solid which should be put in order. Is the lofting bad approach for such body? I see that only one surface is not good: all surfaces located in one plane are OK. The flow of lines on curved surface seems to be "drunk".  Here is the copy of the drawing: uploads/497931/VL_za_krmenu_protustatvu_-_2_-_Copy.dwg" rel="nofollow - uploads/497931/VL_za_krmenu_protustatvu_-_2_-_Copy.dwg I thank for each answer. ------------- Kind regards, Hrvoje |
Posted By: John Connor
Date Posted: 08.Sep.2014 at 12:24
|
Looks like you are getting helped over at CADTutor so there is no need to continue the conversation here. ------------- "Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>> |
Posted By: Mali Zeleni
Date Posted: 08.Sep.2014 at 13:26
------------- Kind regards, Hrvoje |
Posted By: John Connor
Date Posted: 08.Sep.2014 at 14:34
That's entirely up to you. No one is suggesting you leave. ------------- "Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>> |
Posted By: SEANT
Date Posted: 09.Sep.2014 at 09:54
I suggest isolating loft operations to just the pertinent geometry. Extend the geometry as needed to create a surface large enough to slice a solid made from more basic (Box) primitives.
|