Unable to Sweep in Path WB

[browntoastjam]

Hello All,
I have a Bspline path and a sketch object.
I tried to sweep the sketch along the path and can't seem to do it.
The error is "BRepFill_Sweep::BuildEdge"

Screenshot_2022-11-26_13-57-56.png (8.91 KiB) Viewed 647 times

I have attached a MWE with this post.

Any ideas what I am doing wrong?

Code: Select all

OS: Ubuntu 20.04.5 LTS (XFCE/xubuntu)
Word size of FreeCAD: 64-bit
Version: 0.21.31097 (Git) AppImage
Build type: Release
Branch: master
Hash: ccf074008774f1bdfed8fec09ed60e2c0fe77cae
Python 3.10.8, Qt 5.15.4, Coin 4.0.0, Vtk 9.1.0, OCC 7.6.3
Locale: English/United States (en_US)
Installed mods: 
  * Assembly4 0.12.3
  * fasteners 0.3.50
  * sheetmetal 0.2.54
  * Defeaturing
  * Curves 0.5.2
  * Behave-Dark-Colors 0.1.1
  * Assembly3 0.11.3
  * kicadStepUpMod 10.16.5
  * PieMenu
  * ProDarkThemePreferencePack 1.0.0

Thanks.

EDIT: Uploaded file again.

[drmacro]

Empty file..

[drmacro]

Are you trying to do something like this?

Snip macro screenshot-110475.png (53.97 KiB) Viewed 620 times

There is a handy macro by @mario52 in this thread that makes it pretty easy.
https://forum.freecadweb.org/viewtopic. ... 9&start=40

[browntoastjam]

Empty file..

Sorry. Don't know how that happened.
Re-attaching

[browntoastjam]

Are you trying to do something like this?

Snip macro screenshot-110475.png

There is a handy macro by @mario52 in this thread that makes it pretty easy.
https://forum.freecadweb.org/viewtopic. ... 9&start=40

The sweep path isn't as complicated as that.
There are 30 points in the b-spline.
I tried to make another bspline with fewer control points and that seems to sweep fine.

[chrisb]

When I remove the last point the sweep sort of succeeds and shows a rather weird shape, so I guess it is something with the B-spline.

[browntoastjam]

When I remove the last point the sweep sort of succeeds and shows a rather weird shape, so I guess it is something with the B-spline.

It may well be the case that the bspline is somehow "incorrect".
I created the bspline with this code:

Code: Select all

import numpy as np
import Draft
points=30
zpoints=np.linspace(0,2.6,points)
sketch=FreeCAD.getDocument('MakeCable').getObjectsByLabel('Path')
b=sketch[0].Shape.makeOffset2D(4).discretize(points)
for i,j in enumerate(b):
	j.z=zpoints[i]
spline1 = Draft.make_bspline(b,closed=False)

The path is a 2d sketch, and I offset it and stretch it along the z-axis to make it 3D.
Is there something wrong with this code?
Thanks.

[browntoastjam]

Here is another similar example that fails.
The text document within the freecad doc has the exact commands used to create the bspline.

[chrisb]

I created the bspline with this code:

If nobody weighs in, you may repost this in the Python subforum.