Curves workbench

[freecad-heini-1]

Dear Chris_G,
thank you so much for your workbench. I installed it and now I'm experimenting with.

Here is a FC file. Please can you explain how to create a surface out of two rails and 3 other curves.
That would be very helpful.

two-rail-surface.fcstd

(24.76 KiB) Downloaded 219 times

Excuse me, but this tool is not included under my icon toolbar:

birail-object.png (96.7 KiB) Viewed 8277 times

This is my icon toolbar

icons-curve-workbench.png (12.33 KiB) Viewed 8277 times

[Jee-Bee]

Maybe combining with https://forum.freecadweb.org/viewtopic.php?f=22&t=23243 ?
With a bit of C++ i think it would a realy powerfull workbench time to beat rhino3D

[Chris_G]

Here is a FC file. Please can you explain how to create a surface out of two rails and 3 other curves.
That would be very helpful.

Take a look at the attached file.
Steps are :
- select Sketch003 and Sketch004
- Part WB -> Ruled Surface
- select Ruled_Surface / Sketch / Sketch002 / Sketch006
- Curves WB -> Sweep on 2 rails
- Select Sweep_2_rails
- Curves WB -> Curve Approximate ( bad name, since it works on surface also ... ) 5th icon of the toolbar.

EDIT : about the missing icon. I removed this intermediate object ( birail ) tool. Please use a Part->Ruled_Surface instead.

[freecad-heini-1]

I found a great tool inside the curve workbench and my hope ist that it can create a copy of selected edges and convert into a bspline without inbetween segments. Please check out my new video, and sorry my lala English ...
http://www.dailymotion.com/video/x5senpd

[Chris_G]

Would you share your example FC file, please
What you can try is to discretize one of the segments (4th tool in my WB), and see if Target property offers to switch to "Wire".
In that case, the whole wire is discretized, you can adjust the number of points, and run "approximate" tool on them.

[chrisb]

time to beat rhino3D

Had a look at their website, it announces more than 2000 improvements.
I guess that every commit in the git repository is an improvement. So FreeCAD usually has this amount of improvements in a couple of weeks, sometimes only days!

[hammax]

...if the Problem once is solved, all other is rather easy.
The newly introduced intermediate step with the part=>ruled_surface was simple to memorize.
Another thing was the understanding of the 20x20 Wireframe-grid. Is it always 20x20 ?
Looking at the pictures, the grid is equally spaced along the rails and endprofiles, what must get some "distortion".
If I want parallel profiles, I have to apply part=>cross_sections.

Sail_2.PNG (83.01 KiB) Viewed 8187 times

[freecad-heini-1]

Would you share your example FC file, please

Thank you for your help.
My Freecad file:

fc017-flaechen-aus-kanten.fcstd

(593.97 KiB) Downloaded 190 times

[Chris_G]

Another thing was the understanding of the 20x20 Wireframe-grid. Is it always 20x20 ?

In the data tab of the properties of the sweep2rails object, you can adjust the RailSamples and ProfileSamples numbers :

data.jpg (18.32 KiB) Viewed 8139 times

[microelly2]

I found a great tool inside the curve workbench and my hope ist that it can create a copy of selected edges and convert into a bspline without inbetween segments. Please check out my new video, and sorry my lala English ...
http://www.dailymotion.com/video/x5senpd

There is a way to transform (allmost all useful) curves into bspline curves and concatenate them to a single nurbs.
here is a picture of a composite of two half circles, a line an bspline curve merged to a single (non uniform) bspline curve.

using this we need no more discretize and approximate to get such curves.
I have to extend it into 3D
but here is a first testcase to understand the idea

bp_551.png (4.11 KiB) Viewed 8127 times