Boolean Intersection

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gsandy
Posts: 115
Joined: Sun Jan 27, 2019 7:07 pm
Location: Auckland New Zealand

Boolean Intersection

Postby gsandy » Sun Aug 18, 2019 1:52 am

If I preform a Boolean intersection with Extrude001 and Extrude002 (see attached) the result disappears from view! Can anyone tell me why?
Thanks Sandy.

OS: Windows 7
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.16131 (Git)
Build type: Release
Branch: releases/FreeCAD-0-18
Hash: 3129ae4296e40ed20e7b3d460b86e6969acbe1c3
Python version: 3.6.6
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/NewZealand (en_NZ)
Attachments
Front Wheel 18-8-19A.FCStd
(39.19 KiB) Downloaded 5 times
Last edited by gsandy on Sun Aug 18, 2019 8:25 pm, edited 1 time in total.
chrisb
Posts: 17585
Joined: Tue Mar 17, 2015 9:14 am

Re: BOOLEAN INTERSECTION

Postby chrisb » Sun Aug 18, 2019 2:53 am

Coplanar faces are not recommended for boolean operations, they frequently fail. Raise one of your objects a tiny little bit and it will succeed.
gsandy
Posts: 115
Joined: Sun Jan 27, 2019 7:07 pm
Location: Auckland New Zealand

Re: BOOLEAN INTERSECTION

Postby gsandy » Sun Aug 18, 2019 3:28 am

Thanks Chris that worked and all is now OK. Cheers Sandy
chrisb
Posts: 17585
Joined: Tue Mar 17, 2015 9:14 am

Re: BOOLEAN INTERSECTION

Postby chrisb » Sun Aug 18, 2019 9:06 am

You're welcome. Although this issue is well known, there is not much that the FreeCAD developers can do about it. It comes directly from the geometric kernel. Users of proffesional multithousand $$ programs have reported that even those programs can show such behaviour, albeit less often.
gsandy
Posts: 115
Joined: Sun Jan 27, 2019 7:07 pm
Location: Auckland New Zealand

Re: BOOLEAN INTERSECTION

Postby gsandy » Sun Aug 18, 2019 7:11 pm

I certainly have no complaint about Freecad and are very grateful that it is available, free, to non-professionals like me. Cheers Sandy.
openBrain
Posts: 1846
Joined: Fri Nov 09, 2018 5:38 pm

Re: BOOLEAN INTERSECTION

Postby openBrain » Sun Aug 18, 2019 8:08 pm

Would be appreciated if you can avoid a whole caps title next time. ;)
My eyes are bleeding. :lol:
gsandy
Posts: 115
Joined: Sun Jan 27, 2019 7:07 pm
Location: Auckland New Zealand

Re: BOOLEAN INTERSECTION

Postby gsandy » Sun Aug 18, 2019 8:19 pm

OK, yes it is rather loud! Never thought about it when I submitted the question.
openBrain
Posts: 1846
Joined: Fri Nov 09, 2018 5:38 pm

Re: BOOLEAN INTERSECTION

Postby openBrain » Sun Aug 18, 2019 8:21 pm

Notice that you can always change that by editing the OP's title field. ;)
gsandy
Posts: 115
Joined: Sun Jan 27, 2019 7:07 pm
Location: Auckland New Zealand

Re: Boolean Intersection

Postby gsandy » Sun Aug 18, 2019 8:27 pm

I got the first post title changed but not the rest!
openBrain
Posts: 1846
Joined: Fri Nov 09, 2018 5:38 pm

Re: Boolean Intersection

Postby openBrain » Sun Aug 18, 2019 8:31 pm

Yep. But it also changes the title as displayed in the topic list. ;)
My eyes are happy. :lol: