Curves workbench

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karlsinn
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Joined: Mon Dec 05, 2022 10:00 am

Re: Curves workbench

Post by karlsinn »

that works,
nice!!

thanks
karlsinn
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Joined: Mon Dec 05, 2022 10:00 am

Re: Curves workbench

Post by karlsinn »

now I have another problem.

In the test file I will attach. When I select the lines in order from top to bottom and then the left and last the right line and then try to make a Gordon surface. The whole freecad freezes which leaves two questions:

- why can't I create this gordon?
- it freezes, is this a bug?

thanks,
Karl
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Chris_G
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Re: Curves workbench

Post by Chris_G »

Curves must have a grid-like pattern.
The black curve that joins the bulb of the green curve isn't compliant with that requirement.
karlsinn
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Re: Curves workbench

Post by karlsinn »

ok

so how I would connect something like this to a surface?
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onekk
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Re: Curves workbench

Post by onekk »

Post amended to save thread space.
Last edited by onekk on Mon Mar 13, 2023 7:29 am, edited 1 time in total.
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Vincent B
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Re: Curves workbench

Post by Vincent B »

gordon doesn't like this kind of corner. :roll:
it's better to use filling feature for a flat surface here.
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onekk
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Re: Curves workbench

Post by onekk »

Post amended to save space on thread.
Last edited by onekk on Mon Mar 13, 2023 7:30 am, edited 2 times in total.
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- In deep articles on FreeCAD.
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rScott
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Re: Curves workbench

Post by rScott »

I am trying to make a simple curved object. It is a wingtip but it could be a boat or canoe. I want to parameterize it with a spreadsheet. I have tried several approaches. Using a ruled surface, sweep2rails, and Approximate works but only to the outer profiles. I can not get the point cloud to extend to the front and back (bow & stern). Sometimes the Gordan surface works and sometimes it fails. Often when it fails, it gives the spinning wheel and requires killing freecad.

I would certainly appreciate any suggestions on a workflow for creating this type of object. I suspect, there are restrictions on the bow and stern profiles but I don't currently understand them. ;)

Thanks,

Code: Select all

OS: Arch Linux
Word size of FreeCAD: 64-bit
Version: 0.21.0.31917 (Git) AppImage
Build type: Release
Branch: master
Hash: 4639283b459f9ff9093e289908cc003db8745b82
Python 3.10.9, Qt 5.15.6, Coin 4.0.0, Vtk 9.1.0, OCC 7.6.3
Locale: English/United States (en_US)
Installed mods: 
  * Plot 2022.4.17
  * Curves 0.6.5
  * AirPlaneDesign 0.4.0
  * CurvedShapes 1.0.4
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Chris_G
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Re: Curves workbench

Post by Chris_G »

For Gordon surface you need to have a grid-like pattern :
viewtopic.php?t=29632&start=70#p280130
Same for the approximate tool, where you must provide a list of objects that all contain the same amount of points.
Surfaces that degenerate to a single point at the ends are not supported.
Both tools can only generate curved rectangles (= with 4 sides).
edwilliams16
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Re: Curves workbench

Post by edwilliams16 »

rScott wrote: Sun Mar 12, 2023 11:08 pm I am trying to make a simple curved object. It is a wingtip but it could be a boat or canoe.
Have you looked at this thread? viewtopic.php?p=665470#p665470
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