Creating B-Splines from imported ASC file

[hooshsim]

Does FreeCAD have an option to convert points imported from ASC file into B-Splines automatically or we have to create them ourselves manually using B-Spline in draft WB?
Thanks - Hooshsim

[jnxd]

Maybe my own ignorance: what is an ASC file? Juwt ASCII text?

[jnxd]

@hooshsim forgot to tag you for above question. I don't know if it works if I edit.

[wmayer]

Maybe my own ignorance: what is an ASC file? Just ASCII text?

It's a very simple format of a point cloud where in each line you have three coordinates:
Example:

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0.0000 0.0000 0.0000
0.1234 1.0345 2.6578
....

[thschrader]

Does FreeCAD have an option to convert points imported from ASC file into B-Splines automatically or we have to create them ourselves manually using B-Spline in draft WB?
Thanks - Hooshsim

As far as I know there is no automatic method to create B-Splines from the point cloud.
The cloud is represented as one object in the model tree.
See the example below from the Dehler-Yacht.
How should the algorithm know which points to connect?

Dehler.asc.txt

(5.21 KiB) Downloaded 16 times

Example taken from @hammax:
https://forum.freecadweb.org/viewtopic.php?f=13&t=74839

[onekk]

It is not very complicated to convert such a file in something that FreeCAD can utilize to be passed to a BSPline method, already done for NACA airfoil profiles sone time ago, and more recently to scan some molecular Data from an ASCII file.

Sorry I have no computer at hand for some time to supply dome code. But probably earching for "airfoil" and my nickname probably will give some results.

Regards

Carlo D.

[edwilliams16]

This is very easy. Import your ascii file splinedat.asc using the Points workbench. In the python console:

Code: Select all

import Draft
doc = App.ActiveDocument
shp = doc.getObject("splinedat").Points
Draft.makeBSpline(shp.Points)
doc.recompute()

[Vincent B]

Surfaces can be made manually if points are not too many.

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import Draft
selobj = Gui.Selection.getSelection()
obj = selobj[0]
count = len(obj.Points.Points)
i = 0
comp = App.activeDocument().addObject("Part::Compound","Points_Compound")
for pt in obj.Points.Points:
    p = Draft.makePoint(pt)
    comp.Links += [p]
    i += 1
print ("Nb points = "+str(count))
App.ActiveDocument.recompute()

[hooshsim]

Vincent,
What’s this code and how to use it. I’m not an expert on freecad. Please advice
Thanks-Hooshsim