Hi guys,

There is a specific method of creasing the fabric to make a simple seat like this ... is it possible to make it?

Why not ? :)
Joint is your friend!

Of course Pilou I had done this test but I meant around the perimeter of the seat as it is in the picture .... that I was not able to do :)

The folds are only around the perimeter

What is the difference ?

Joint can be always made between 2 boundaries! (even if one or both are circonvoluted)

So that is shown above will work with your model!

I meant the folds around the perimeter ... I don't know if I made myself clear :)

Will be naturally distributed between your 2 boundaries!

But in this way the creases remain .... or am I wrong?

The more difficult is to find the 4 directions for the top face ! ;)



Another thing can be used : Nsided but works only with polylines edges and not curves!
You can regulate the Bulge!

Hi Tony, small localized bumps and folds like that are not handled very well by CAD geometry, that's something that can be done better in a polygon modeling program rather than in MoI.

3D Coat and ZBrush are pretty good for that type of thing.

- Michael

You can also try the funny subdivision inside Moi Itself ;)
https://moi3d.com/forum/index.php?webtag=MOI&msg=9689.1

I like Pilou's method, but I would make the blend distance much longer.

Make one "C" curve along the sewn seam, with the open end facing downward.
Place the "random" wave along the C curve. Offset the C curve upwards and wider.
Flow the wave to the upper, bigger C curve. Sweep a line along the two waves. The bottom edge of the wave surface will be used for a blend, downward, to a 3rd C arch surface without any wave. It's top edge is the edge to blend to.

Well I still have to try this:-)

Brian

There is a curved crease origami article. They used Rhino and Grasshopper..- B

I did a quick test following your advice .... now I try to apply it to the shape of my seat and see how it comes out

I tested a process.
A possible way to do what you want.
You can have creases in all directions with this method.

First, I did a cushion. I took a revolve by rail choice.



Next I took 3 iso curves to extract zones where we will do creases.
I used script DistortCuvresRebuild to do creases only with Z dimension (red curve).
I used the same script to have a non regular zone where creases will disapear but only with X and Y distortions (orange curve).
The third iso is green to have a base of the side of cushion.

I use loft/loose to create creases with the 3 curves I had now.
Then I fix the jointure to have a solid by blending surfaces (creating the blue curve by cloning orange to cut the plane before blending).






I add a small border too.





You could do better with small adjustments, I think.

Looks good Philo.

Please correct me if I am wrong:

The red, orange, and blue curves began life as "smooth" iso-curves of the cushion.
They are concentric, due to the revolve rail used to create the cushion.
( The red curve began as the green curve, to which z distortions was done. )
The parent curve of the orange curve had xy distortion applied to it.
Similarly for the blue curve. Wonder why the blue curve appears to be a scaled down version of the orange curve?

- Brian

Thanks Phiro

could you kindly explain me the speech of the iso curves? ... do you extract them from the model or build them directly?

I didn't understand the whole process .... it's definitely what I need

You're globaly right Brian.

The green, red and orange curves began life as "smooth" iso-curves of the cushion.

Yes, they are concentric because of the revolve rail used to construct the cushion.

The red curve is an iso as is the green an another iso.
The red one has a z distortion

Yes, the Orange is an iso with a XY distortion applied.

But the blue is a clone of the orange with a scale (the cause of the similarity). I made the blue because when I did the lofting I didn't have sufaces which could be joined as solid.
Blue is used to cut the flat top before doing a blending.
The blending gave me a surface to join and have a solid.

I always do solids because I always do models for 3dprinting.
But for a illustration it's not so important... or useless.

I don't remember when I add rebuild or reconstructcurve, but I do it often to smooth or delete the hard angles.


Have a fun Moment Of Inspiration !

Francois

Sorry Tony,

I will detail the process.
My first post was not detailled and I forgot steps...

But don't worry ... it was just to understand better :)

Ok I redo step by step but I don't remember well... so I do a new process too.


I do a revolve with rail to have a single surface and have next simple iso curves.




I do 3 iso curves orange red and green






I used the "DistortCurvesRebuid" script.
The orange one is distorted on X and Y. You can rescale if the waves created are too big.

I have trimed the cushion with iso curves before deleting the useless border (and top) we will recreate with creases.

The red curves is Z distorted to have some waves for the creases. You can rescale on Z to have more amplitude on creases.





Verify if you have closed curves red orange and green
I duplicate and rescale to have another orange smaller

You can now do the lofting (with loose loft to have smooth loft). orange, orange, red and green. (don't cap your loft).








Next, i can "blendcap" to redo a the top with the closed edge created by loft.

You can join surfaces to have a solid.

You can border the edge with a sweeped circle.






I hope to have been more clear with this version.