Curves workbench

[keithsloan52]

yes, why not?

So how do I make the curve in the attached file editable? or are you saying it might be possible in the future?

BezierCurve.FCStd

(4.46 KiB) Downloaded 33 times

The curve was created by importing a 3DM file (Rhino) with the Import ImportNurbs workbench.

[hammax]

... pointing to the behaviour of Freehand_BSpline I discretized the polycurve and applied a Freehand_BSpline.
Comb tools show the discrepancies and the "not so smooth" bending flaw.

PolyCurve.PNG (35.51 KiB) Viewed 1503 times

[keithsloan52]

... pointing to the behaviour of Freehand_BSpline I discretized the polycurve and applied a Freehand_BSpline.
Comb tools show the discrepancies and the "not so smooth" bending flaw.


PolyCurve.PNG

I was thinking more on the lines of the PolyCurve Shape was created with a call to Part.BSplineCurve(), so it has control points, knots, period, degree's etc so it should be able to access these directly and have it editable, even if this meant adding functionality to one or both the the workbenches

[Vincent B]

... pointing to the behaviour of Freehand_BSpline I discretized the polycurve and applied a Freehand_BSpline.

great. vertexes from discretized_edge could be copied into the freehand_bspline when creating it.
@Chris_G

[Chris_G]

... pointing to the behaviour of Freehand_BSpline I discretized the polycurve and applied a Freehand_BSpline.
Comb tools show the discrepancies and the "not so smooth" bending flaw.

Freehand_BSpline is a cubic interpolation curve. Every interpolated point introduces a knot, that breaks down the continuity to C2.
Nothing wrong here.
If you want very high continuity, maybe you should look at approximation instead.

great. vertexes from discretized_edge could be copied into the freehand_bspline when creating it.

I'll have a look.

[onekk]

So how do I make the curve in the attached file editable? or are you saying it might be possible in the future?

When I have problems I use the Curves WB command export to python console, that create a copy of the BSPline using definition data poles knots and similar.

Runnin the code in the macro editor will recreate the curve in 3d view and in the treeview (obviously).

The curve has to be a BSPline or could be converted to a BSPline.

Hope it helps

Carlo D.

[hammax]

... I tried onekk's recipe and created a Sketcher BSpline as an overlay.
Control/knot points position were from the "export" tool (visualized in ViewTab).
But they could not be used as external references => therefore they were only positioned by eye.
That gives a nearly identical and smooth "polyline".

PolyCurve_2.PNG (39.57 KiB) Viewed 1355 times

[keithsloan52]

... I tried onekk's recipe and created a Sketcher BSpline as an overlay.
Control/knot points position were from the "export" tool (visualized in ViewTab).
But they could not be used as external references => therefore they were only positioned by eye.
That gives a nearly identical and smooth "polyline".


PolyCurve_2.PNG

I am confused. I am not interested in re creating any overlays etc. I got the impression from these two posts

181A504E-3031-4993-8D7C-142F0B8EB0E8.jpeg (373.57 KiB) Viewed 1309 times

that there were new facilities to edit curves I am looking for a way to edit the curve.

[Chris_G]

I am confused. I am not interested in re creating any overlays etc. I got the impression from these two posts
that there were new facilities to edit curves I am looking for a way to edit the curve.

No. No curve editing has been implemented. The control points can only be displayed, not moved.

[chrisb]

Not sure if this is a feature request: When Geominfo mode is enabled, and I'm using TechDraw, then there are lots of errors shown in report view.

To reproduce:
- create a cube
- enable Geominfo mode
- create a TechDraw page
- select the cube (what would be done in order to place it on the page).

-> errors shown in Report view:

Code: Select all

  Traceback (most recent call last):
  File "/Users/cb/Library/Application Support/FreeCAD/Mod/Curves/./freecad/Curves/GeomInfo.py", line 445, in addSelection
    self.addHUD()
  File "/Users/cb/Library/Application Support/FreeCAD/Mod/Curves/./freecad/Curves/GeomInfo.py", line 413, in addHUD
    self.sg = self.view.getSceneGraph()
<class 'AttributeError'>: getSceneGraph
00:36:12  Traceback (most recent call last):
  File "/Users/cb/Library/Application Support/FreeCAD/Mod/Curves/./freecad/Curves/GeomInfo.py", line 445, in addSelection
    self.addHUD()
  File "/Users/cb/Library/Application Support/FreeCAD/Mod/Curves/./freecad/Curves/GeomInfo.py", line 413, in addHUD
    self.sg = self.view.getSceneGraph()
<class 'AttributeError'>: getSceneGraph

Code: Select all

OS: macOS 10.16
Word size of FreeCAD: 64-bit
Version: 0.21.30143 (Git)
Build type: Release
Branch: master
Hash: a72bf218f9917df37e811d7e73a36333282028f5
Python 3.10.5, Qt 5.15.4, Coin 4.0.0, Vtk 9.1.0, OCC 7.6.2
Locale: C/Default (C)
Installed mods: 
  * FC_SU
  * FeedsAndSpeeds 0.4.0
  * fcgear 1.0.0
  * fasteners 0.3.51
  * sheetmetal 0.2.56
  * ExplodedAssembly
  * Curves 0.5.4