tutorials for my NURBS macros

[triplus]

...i have a special non-bezier grid and surface just for that task.

I like the sound of that.

[emills2]

Yes this is similar to the version i used. If you will try the latest one (Version: 0.17.10101):

https://github.com/FreeCAD/FreeCAD/releases

You will likely observe the same issue as mentioned earlier. Note that i didn't check the code and i don't know if anything changed in FreeCAD. If it's tolerance related something like this should fix it (in pseudocode):

i just tried it out, you are correct
i can open my files in 0.17.10101

NURBSlib_EVM model in 0.17 10101- 01 open ok.png (373.55 KiB) Viewed 1802 times

but any edit that recomputes the grid fails in the 'orient_a_to_b' routine (as Microelly correctly determined)

NURBSlib_EVM model in 0.17 10101- 02 edit breaks vertex equality.png (226.67 KiB) Viewed 1802 times

i'm fine with adding tolerance checks in principle, but i don't know if i can keep up with the release schedule. And the icons would look different all the time, the tutorial pictures would never match...this is a big deal.

So i can't write for 0.17, but the system is basically useless without sketch attchment in 0.16

I wish an official .17 would get released so i could write my tools against that i might have to host a particular binary that works with my tools. But even that is extra work, and it will turn people away. I'm really big on the principle that 'it has to actually work'.

[emills2]

You will likely observe the same issue as mentioned earlier. Note that i didn't check the code and i don't know if anything changed in FreeCAD. If it's tolerance related something like this should fix it (in pseudocode):

Code: Select all

if abs(p1 - p2) < 1e-07:
    points equal
else:
    points not equal

you are right, and i do use a similar mechanism in many spots. However, it was really nice to not need it in cases where the points are identically equal.

[emills2]

I wish an official .17 would get released so i could write my tools against that i might have to host a particular binary that works with my tools. But even that is extra work, and it will turn people away. I'm really big on the principle that 'it has to actually work'.

I need to apologize for all the whining sorry!

I know the solution, and no one owes it to me! i just need to learn to compile FreeCAD, then i can maintain my own version exactly how i like it.

Until then, i am thankful for whichever binaries others prepare for me.

[emills2]

i have fixed the issue that affects this tutorial on 0.17.10133, so it should be functional. The other issues i mentioned don't come up as far as the tutorial 0.01 and 0.02 are concerned.

[emills2]

turns out it was just the tolerance...over...and over...and over. With different error messages each time, and sometime no error messages, just a subtly broken model, that appears to work. But it's fixed!

Bezier primary Surface Volume 67 - in 0.174.10133 - 02 fully recovered.png (230.96 KiB) Viewed 1757 times

[triplus]

There you have it. Being tolerant is not always easy but it can prove to be useful!

[emills2]

As i was committing new stuff today, i realized today that i had not uploaded the fix i did 9 days ago to the problems reported by Triplus and Microelly2 sorry!

Everything is tested up to 0.17.10291 (and 0.17.10131)

Tutorial 0.03 Point_onCurve ControlPoly4_Segment ControlPoly6 and CubicCurve6 on the way. model and images ready. I hope to have it ready this weekend.

shown below: G2 blend of a line segment to a true circular arc. Shown as generated by default. There are many degrees of freedom remaining that are available for design purposes or for manual tuning towards G3

ControlPoly6 Auto G2.gif (607.96 KiB) Viewed 1689 times

Once again, if anyone tries this and finds it broken, please let me know!

[triplus]

Was the last post in this thread edited?

As i don't remember:

Tutorial 0.03 Point_onCurve ControlPoly4_Segment ControlPoly6 and CubicCurve6 on the way. model and images ready. I hope to have it ready this weekend.

Reading this. And i was waiting for the thread to be bumped again. But as it didn't happen i decided to ask today on the current status of things. And as for the Tutorial 0.03 itself it wasn't published yet?

[chrisb]

Was the last post in this thread edited?

If a post is edited after someone has read it, it shows the time and number of edits at the bottom. I know this because I had to correct at least typos in my posts more than once, although I always preview them. (Example: https://forum.freecadweb.org/viewtopic. ... 69#p171527)