topic Re: Tube command 3d parts not aligned in GDL

Tube command 3d parts not aligned

Piotr Dobrowolski — Tue, 16 Dec 2025 17:51:29 GMT

I am creating an object that will be a parametric car ramp using a tube command as a base of geometry. The geometry is then cut to parametric outline in plan to fit the needed geometry.

And I found out that tube command (1st or 2nd) is buggy as hell with alignment of the geometry parts.

It is not visible from the outside, but doing a section reveals the "secret". Easy to check with the railing tool with the profile of the slab 3m wide with 2 layers one finish - 5cm and base - 20 cm.

The left is a non cut one the right is using the cut to fit the outline.

Plan i rotated 90 deg from what is seen in 3d

Here goes the section of the non cut one:

The outside is aligned...but not what happens inside.

But when it is cut it becomes even "funnier":

Any fix of this command is on the "go"?

It is very usable in many cases.

For finishing the tool I have on the workshop I will probably need to do a series of bolean operations which will slow down the model...or I will give the advice to use single, non composite slab...which sounds no good.

Piotr

Re: Tube command 3d parts not aligned

rudl — Thu, 18 Dec 2025 11:06:15 GMT

My guess is:

Because its very thin and depending on how top and bottom faces are triangulated
-> some self intersection could happen.
And when you apply the cut it probably tries to "fix" it.
Solution would be to make the Tube more detailed, more controlpoints in the recetangle aswall as in the path curve

-rudl

Re: Tube command 3d parts not aligned

Piotr Dobrowolski — Wed, 17 Dec 2025 17:37:07 GMT

More detailed...meaning more vertices...does not help much - the triangulation algorithm is not aligned unfortunately.

What i noticed - the top surfaces of say. both tubes are aligned, but the top and bottom surface never. It seems the initial designer of this command did not take care about it 😞

So finally I will do the bolean ops 😞

Re: Tube command 3d parts not aligned

rudl — Wed, 17 Dec 2025 17:59:33 GMT

Well you could use MULZ -1 to mirror it and code in the oposite Z-direction in addition one tube
So that two top or bottom surfaces touch 😅 that could work

Re: Tube command 3d parts not aligned

Piotr Dobrowolski — Thu, 18 Dec 2025 11:03:54 GMT

Not that easy...because the the path of the tube would have to be also mirrored in Z...and I need it to be universal and more layers as in the real life 😛

Betreff: Tube command 3d parts not aligned

Hmooslechner — Fri, 19 Dec 2025 05:19:02 GMT

Not exact the topic, but as reminder..

(Piotr - Thanks for the Profile-Code some Years before)

Do You Know the Ramps i made? Straight and rotated- even as Spiral?

https://bimcomponents.com/GSM/Details/23828

https://bimcomponents.com/GSM/Details/24250

Betreff: Tube command 3d parts not aligned

Piotr Dobrowolski — Fri, 19 Dec 2025 10:00:58 GMT

If there is one material solution...it fairly ok with the tube, but when more (also profile with more than one element) it gets "dirty"

I am trying to make an element where first step is to draw/modify a path like a reference line in the wall/beam - and it will create a shape based on the tube.

The second step would be "unlink" the outline from the initial shape and further modify the outline to fit space sometimes not regular (like outline of the shell).

So when cutting of the tube is kicking-in...the tube kicks back with the irregularities of triangulation (which is always there but not so much visible when not cut).

Betreff: Tube command 3d parts not aligned

Hmooslechner — Fri, 19 Dec 2025 10:47:27 GMT

in my recent codet Stair-Tool, using the Goodies-addon for Polylines, i did not use the tube-command - of that reason - but instead i used some SEO-operations to get similar forms - rough so far, but geometrically ok. (german, but i thin you get the point.. The script - Made by Google-KI Gemeni3Pro (and me)..

Betreff: Tube command 3d parts not aligned

cuba — Tue, 23 Dec 2025 10:16:38 GMT

Very cool! crazy!

Betreff: Tube command 3d parts not aligned

Hmooslechner — Sat, 27 Dec 2025 10:20:02 GMT

a ramp with mass-command - not directly with tube. Tubes just for the ramp edges - made 95% with Google-Gemini3Pro AI and my corrections in a few hours. You just have to make very little steps (prompts) and have patience, let it correct the errors from Archicad's test routines - simply copy the error messages to the prompts - it mostly corrects it, if not, try again. Sometimes it "halluzinates" commands from other Script-languages, but Archicad's test-routine will point at it, so You can send a correction-promt to the AI.

(german)
https://www.youtube.com/watch?v=3kemRVxB1PA

AC29EduAut-Version: https://www.dropbox.com/scl/fi/kepw3jkgl9uiketrpj2hi/Strassen-T-8-und-Rampe-29a.pln?rlkey=r5b5hqamqv0tidzoejly8y9kf&st=d2lur8b6&dl=0

Re: Tube command 3d parts not aligned

Piotr Dobrowolski — Thu, 22 Jan 2026 22:36:19 GMT

For now I partially solved the issue (because there are still funny irregularities but much smaller) with every single composite to be slightly thicker and a bool subtraction of the offseted dummy element below - so the top & bottom surface is almost the same way triangularized.

Betreff: Tube command 3d parts not aligned

Otavio A — Mon, 13 Apr 2026 01:12:37 GMT

that's amazing!