topic Re: shell tool : curve on 4 sides in Modeling

shell tool : curve on 4 sides

Anonymous — Wed, 24 May 2023 16:59:56 GMT

Hello, I need a shell plate with curves adjustable on 4 sides (not just 2 sides), how can I do?
or any other tools can achive this?
Thanks

Re: shell tool : curve on 4 sides

DGSketcher — Thu, 27 May 2021 11:08:59 GMT

See if this help article on ruled shells helps...

https://help.graphisoft.com/AC/24/INT/#t=_AC24_Help%2F040_ElementsVB%2F040_ElementsVB-124.htm&rhsearch=Shell&rhhlterm=Shell&rhsyns=%20

Re: shell tool : curve on 4 sides

Anonymous — Thu, 27 May 2021 11:24:47 GMT

Hello DGSketcher, but
in rules mode, there are still only 2 sides rules, now I need 4 rules on 4 sides....4 sides has to be curved
I had tried spliting it to 2 triangles with 2 rules each, but the joint not matched,

and any other methods?
Regards

Re: shell tool : curve on 4 sides

Barry Kelly — Thu, 27 May 2021 11:49:25 GMT

There is a very old post here with a "tentmaker" object.

https://archicad-talk.graphisoft.com/viewtopic.php?p=34271&sid=60f5113ac5263c2e02f4f07e260c8fd8#p34241

I did see a post in 2013 from Oliver Denton saying there was an updated object - but there is no longer any link in that post.

The old one should still work and once yo have the shape you can convert to a morph if need be (although that will be hard to edit further if you need to).

Maybe a bit of googling for "tentmaker" or "shade sail" might find some newer results.
Oliver hasn't been active here since 2014.

Barry.

Re: shell tool : curve on 4 sides

Anonymous — Thu, 27 May 2021 15:22:12 GMT

hello Barry,
yes that GSM is indeed good, and how to make it (with shell tool or etc?) because i have a precise fine curve by myself on 3 sides....

Regards

Re: shell tool : curve on 4 sides

Aaron Bourgoin — Thu, 27 May 2021 15:49:37 GMT

I seem to recall the Italians posting a NURBS GDL object. That might also work?

Re: shell tool : curve on 4 sides

DGSketcher — Thu, 27 May 2021 16:29:04 GMT

You should be able to achieve what you want with a Morph. In the attached I created a box Morph. Set the corner heights. Used the curve tool vertically on the top edges. The back edge was split in two and equal +/-ve curves used. You may see the top face distort with exaggerated edges while forming this. To get around this, delete just the top face and then use the Morph > Cover with faces or the Solidify option to put the top face back. This seems to even out the surface mesh. The other thing you can do is select the edges and use the Morph > Modify Segmentation option on the curves. If you need to give the surface a thickness, the best I can suggest is create a copy lowered by the required thickness and subtract the copy from the original.

Here's a GS video that might help you understand what I did...
https://helpcenter.graphisoft.com/user-guide/134883/

Re: shell tool : curve on 4 sides

Anonymous — Thu, 27 May 2021 16:39:02 GMT

I recall an old but still brilliant object scripted by the legendary Petri Leskinen. (Unfortunately we never had any feedback from him after all these years).
It was called "Mesh 3D". I think it will do the trick.
You can find it here.
It was also used in this thread.
Hope this helps.

Re: shell tool : curve on 4 sides

Anonymous — Fri, 28 May 2021 00:32:53 GMT

oh ya, morph made it. Mesh tool maybe tested later

Nurbs function is good at Maya etc but not in BIM softwares

Thanks DGSketcher and all