Loft with Shapebinder

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johansson
Posts: 7
Joined: Mon Jul 12, 2021 3:51 pm

Loft with Shapebinder

Post by johansson »

It seems Loft with two ShapeBinder is not possible. Can someone confirm that this is intended behaviour?
Or am I doing something wrong? (On a side note: Padding the ShapeBinder works.)

Please find attached a project file. The Loft works with the the Sketches in Body but does not succeed in Body001 with the ShapeBinder.

OS: Windows 10 Version 2009
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.24291 (Git)
Build type: Release
Branch: releases/FreeCAD-0-19
Hash: 7b5e18a0759de778b74d3a5c17eba9cb815035ac
Python version: 3.8.6+
Qt version: 5.15.2
Coin version: 4.0.1
OCC version: 7.5.0
Locale: German/Germany (de_DE)
noloft.FCStd
(15.63 KiB) Downloaded 21 times
Thanks in advance.
Regards, Johannes
drmacro
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Posts: 8865
Joined: Sun Mar 02, 2014 4:35 pm

Re: Loft with Shapebinder

Post by drmacro »

I think that is correct.
Star Trek II: The Wrath of Khan: Spock: "...His pattern indicates two-dimensional thinking."
johansson
Posts: 7
Joined: Mon Jul 12, 2021 3:51 pm

Re: Loft with Shapebinder

Post by johansson »

Do you perhaps have a little background on this topic?
Why is padding possible but not loft?
As a beginner I'm always thinking I'm doing something wrong.
drmacro
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Posts: 8865
Joined: Sun Mar 02, 2014 4:35 pm

Re: Loft with Shapebinder

Post by drmacro »

I don't know if there is a technical reason.

But, Pad-ing/Pocket-ing ShapeBinders is a relatively recent addition.

So, it doesn't surprise me.

It could be it is a limitation of the Loft capabilities of the OpenCASCADE modelling engine. But, I'd guess it is because the Loft tool expects a particular type of edge construct and the ShapeBinder really being reference geometry would need intermediary to interpret what is stored in the ShapeBinder.

I suspect this is what has been done for the Pad operation.

Interestingly, other than the out of scope warning, a Part workbench Loft of the ShapBinders does work. So, I'm guessing it has just not been implemented in Part Design Loft as yet.
Star Trek II: The Wrath of Khan: Spock: "...His pattern indicates two-dimensional thinking."
TheMarkster
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Posts: 5505
Joined: Thu Apr 05, 2018 1:53 am

Re: Loft with Shapebinder

Post by TheMarkster »

It's probably expecting a sketch-based object and maybe the shapebinder isn't that, so it isn't finding the Wire1 property. See my reply to drmacro's other post on the subject.
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