CAD Forum discussion (EN) : loft and polyline https://www.cadforum.cz/forum_en/ Fri, 17 Jul 2026 02:04:07 +0000 Wed, 03 Dec 2014 11:31:23 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://www.cadforum.cz/forum_en/RSS_post_feed.asp?TID=10806 <![CDATA[CAD Forum discussion (EN)]]> https://www.cadforum.cz/forum_en/forum_images/web_wiz_forums.png https://www.cadforum.cz/forum_en/ <![CDATA[loft and polyline : I unioned the two solids for the...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28586&title=loft-and-polyline#28586 Author: John Connor
Subject: 10806
Posted: 03.Dec.2014 at 11:31

I unioned the two solids for the sake of expediency.


]]> Wed, 03 Dec 2014 11:31:23 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28586&title=loft-and-polyline#28586 <![CDATA[loft and polyline : John it&#039;s a very good result....]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28581&title=loft-and-polyline#28581 Author: philippe JOSEPH
Subject: 10806
Posted: 03.Dec.2014 at 07:18

John it's a very good result.
This will make me stop doing it during my work time !
I will have to explore the "Guide Options" that you are talking about LOFT because I don't know them.
About MASSPROP, in fact you don't have to UNION the solids to have the total, you just need to select the various solids and massprop will give you characteristics of the assembly, this may interresting if you have to work each solid separately or come back on the solids each separately.
In fact JoĂŁo needs the volume in m3 ( and the .dwg file ) and I'd also add the C.O.G. + at least 3 3D dimensions in X , Y , Z.
Again good job John.


Edited by philippe JOSEPH - 03.Dec.2014 at 07:24]]> Wed, 03 Dec 2014 07:18:19 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28581&title=loft-and-polyline#28581 <![CDATA[loft and polyline : The finished product. Edited...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28575&title=loft-and-polyline#28575 Author: John Connor
Subject: 10806
Posted: 02.Dec.2014 at 17:53


The finished product.


Edited by John Connor - 02.Dec.2014 at 17:54]]> Tue, 02 Dec 2014 17:53:51 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28575&title=loft-and-polyline#28575 <![CDATA[loft and polyline : Success. Once again I created...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28574&title=loft-and-polyline#28574 Author: John Connor
Subject: 10806
Posted: 02.Dec.2014 at 17:27


Success.  Once again I created two polyline profiles (top and bottom perimeter) and lofted them.  No need to use the Guides option either.  At this point they just need to be unioned and MASSPROP run on the resultant solid.

The second smaller section confused me at first until I realized the sides were slightly curved. 

Edited by John Connor - 02.Dec.2014 at 17:27]]> Tue, 02 Dec 2014 17:27:09 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28574&title=loft-and-polyline#28574 <![CDATA[loft and polyline : OK...this one is better. I used...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28573&title=loft-and-polyline#28573 Author: John Connor
Subject: 10806
Posted: 02.Dec.2014 at 17:19


OK...this one is better.  I used the Loft command along with the Guides option.  Before lofting I drew a 3Dpolyline at each of the four corners starting from the bottom profile to the top profile.  I think this one is a keeper.  Now to figure out the best way to handle the remainder.


Edited by John Connor - 02.Dec.2014 at 17:27]]> Tue, 02 Dec 2014 17:19:29 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28573&title=loft-and-polyline#28573 <![CDATA[loft and polyline : I think the above may be wrong....]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28572&title=loft-and-polyline#28572 Author: John Connor
Subject: 10806
Posted: 02.Dec.2014 at 17:10

I think the above may be wrong.  A closer look at your drawing reveals that the bottom and top linework that form the perimeter of the object are not lined up exactly.  Extrude may not be the best command to use although I suspect that Loft will result in surfaces and not a solid.
]]> Tue, 02 Dec 2014 17:10:26 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28572&title=loft-and-polyline#28572 <![CDATA[loft and polyline : A big portion of your drawing...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28571&title=loft-and-polyline#28571 Author: John Connor
Subject: 10806
Posted: 02.Dec.2014 at 16:50


A big portion of your drawing created as a solid using the Extrude command.
I'm not sure why you continue to create surfaces first.  Please explain.


Edited by John Connor - 02.Dec.2014 at 16:51]]> Tue, 02 Dec 2014 16:50:16 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28571&title=loft-and-polyline#28571 <![CDATA[loft and polyline : If you separate the large, almost...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28570&title=loft-and-polyline#28570 Author: John Connor
Subject: 10806
Posted: 02.Dec.2014 at 14:17

If you separate the large, almost square, area from the rest of the drawing you'll find that both the top and bottom polylines are indeed flat.
]]> Tue, 02 Dec 2014 14:17:29 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28570&title=loft-and-polyline#28570 <![CDATA[loft and polyline : Yes John is wright. Loft not...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28569&title=loft-and-polyline#28569 Author: philippe JOSEPH
Subject: 10806
Posted: 02.Dec.2014 at 13:41

Yes John is wright.
Loft not predictable in his trajectories to create solids in that case.
I am taking a look at your 2nd file but it's difficult to create region to be extruded because the geometry is not 100% flat and after this the solids to add or remove are not so simple.
]]> Tue, 02 Dec 2014 13:41:53 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28569&title=loft-and-polyline#28569 <![CDATA[loft and polyline : I&#039;m not understanding why...]]> https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28568&title=loft-and-polyline#28568 Author: John Connor
Subject: 10806
Posted: 02.Dec.2014 at 12:53

I'm not understanding why you resort to using LOFT to solve the problem.  95% of what you show could be created as a solid by simply using the Extrude or PressPull command.
]]> Tue, 02 Dec 2014 12:53:07 +0000 https://www.cadforum.cz/forum_en/forum_posts.asp?TID=10806&PID=28568&title=loft-and-polyline#28568