Crossbeam exercise

saso · Post by **saso** » Thu Jul 18, 2019 12:45 pm

Are we up for a new challenge? How far can we push existing FC surface design, what is working, what is missing, what are the workarounds,... ?
https://grabcad.com/library/crossbeam-e ... ns-nx-12-1 <- file with the base curves available here

Vincent B · Post by **Vincent B** » Thu Jul 18, 2019 9:13 pm

First step something looks like. not so easy without fillet feature for surface.
and offset doesn't want work.

saso · Post by **saso** » Thu Jul 18, 2019 10:42 pm

Thanks for the main curves and your model

I quickly played a bit with it and got a bit further... but not the best workflow

microelly2 · Post by **microelly2** » Fri Jul 19, 2019 8:20 pm

: cp_005.png (140.86 KiB) Viewed 887 times

Here is the pyflow graph for the first surface.
The idea was starting with 9 points create some helper poles and then build the poles matrix for the bspline surface.

: cp_006.png (338.07 KiB) Viewed 887 times

bb.FCStd: (29.8 KiB) Downloaded 23 times

microelly2 · Post by **microelly2** » Sat Jul 20, 2019 3:36 pm

here my solution for the 2nd task:pad something onto a nonplanar surface.
I have problems with fillet and chamfer on bspline surfaces, so for rounded edges its need some more tricks and a little bit of time.
I made two new nodes
FreeCAD UV projection uses methods from the nurbs workbench - draw on face it uses the parameter method of a Bspline Surface.
FreeCAD Parallel projection uses the makeParallelProjection method of a Face
Other projection methods may come later.

phpBB [video]

Post by **Kunda1** » Sat Jul 20, 2019 4:00 pm

microelly2 wrote: ↑Sat Jul 20, 2019 3:36 pm

This is next level stuff! Nice!

Vincent B · Post by **Vincent B** » Sat Jul 20, 2019 4:20 pm

microelly2 wrote: ↑Fri Jul 19, 2019 8:20 pm and then build the poles matrix for the bspline surface.

which tool you use to make the surface?

microelly2 · Post by **microelly2** » Sat Jul 20, 2019 5:14 pm

GlouGlou wrote: ↑Sat Jul 20, 2019 4:20 pm
microelly2 wrote: ↑Fri Jul 19, 2019 8:20 pm and then build the poles matrix for the bspline surface.
which tool you use to make the surface?

you can inspect the code
the whole workflow is scripted in crossbeamexample()
https://github.com/microelly2/NodeEdito ... L830-L1110
https://github.com/microelly2/NodeEdito ... #L840-L866
and the real code is still swapped to
https://github.com/microelly2/NodeEdito ... #L144-L180

lines will change with next commit

microelly2 · Post by **microelly2** » Sat Jul 20, 2019 5:28 pm

Kunda1 wrote: ↑Sat Jul 20, 2019 4:00 pm This is next level stuff! Nice!

I watched sverchok for years, but it was not possible to port it to freecad in freetime:
With Pyflow we have the ability get comparable design power.
praise ilgar and pedro who gave us this wounderful framework.

Vincent B · Post by **Vincent B** » Wed Jul 24, 2019 7:45 pm

after spent few hours, step2.

Crossbeam exercise

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