Cloth Simulation

208•adamch•2mo ago

Comments

iberator•1mo ago

Maya and Cloe 3D and almost all fashion design software have it for decades already. Niche and fascinating software. Check out some demos.

Cool stuff in software you don't even know exists:)

zokier•1mo ago

Of course cloth sims of varying fidelity are everywhere. Even games have had cloth sims for decades at this point.

But it is also something that remains a research problem how to do efficiently and with good results; pretty much every year in siggraph you see couple of new papers around cloth sims. For example this year we got this https://youtu.be/d9TZhtXeMio

ChrisMarshallNY•1mo ago

As an artist, I needed to get it right. Wasn't as easy as I thought it would be. I had to think in 3D, to make 2D.

https://littlegreenviper.com/art/Tarsus.png

https://littlegreenviper.com/art/Gym.png

fao_•1mo ago

One of the best ways to practice this is just throwing a towel on a chair, sitting down opposite it, and sketching it

regularfry•1mo ago

The cloth sim in Blender remains one of the most frustratingly un-updated features. I would dearly love to see it get an algorithmic refresh.

brontosaurusrex•1mo ago

At least solver seems faster (if not better) in later versions? p.s. My try at 'flag in the wind' in Blender from around 2022: https://0x0.st/s/aJ6DNj2pEHzRdBiscEIsbQ/KCsK.mp4 I do remember it took me all day to get somehow realistic motion.

Miraltar•1mo ago

Exactly as discussed in Sebastian Lague's video https://www.youtube.com/watch?v=PGk0rnyTa1U

TwoFx•1mo ago

I highly recommend watching the relevant section of that video (4:38 to 8:59) and then implementing it yourself in whatever system you know that can draw lines and circles (I did it in Godot; it took only a few minutes to learn enough Godot to start on the algorithm).

It's absolutely mind-blowing that so little code can produce such a beautiful result. It's also fun to play with the parameters and see how they affect how the cloth feels.

mclau153•1mo ago

would you share your godot code to github?

atan2•1mo ago

A very nice article by Marian Pekár on Verlet integration and cloth simulation:

https://pikuma.com/blog/verlet-integration-2d-cloth-physics-...

jeffreygoesto•1mo ago

For me, "Large Steps in Cloth Simulation" [0] made implicit methods accessible... Seminal paper.

[0] https://dl.acm.org/doi/10.1145/280814.280821

chombier•1mo ago

For inextensible cloth there's also "Efficient simulation of inextensible cloth" [0] that is particularly clever and efficient

[0] https://dl.acm.org/doi/10.1145/1276377.1276438

bogtog•1mo ago

It tearing when I waved my mouse around was a nice surprise

clbrmbr•1mo ago

The tearing was unexpectedly disturbing!

Suggestion: use an accelerometer data on mobile and use that to directly replace gravity. I expect to be able to tip the phone to drape the cloth, and shake the phone to get waves of motion.

Hobadee•1mo ago

This.

I can tear real cloth if I try, but I need to try. A flick of the finger has never once in my life torn cloth.

afandian•1mo ago

Clear you must bite your nails!

fainpul•1mo ago

Literally unplayable

brookst•1mo ago

It feels a bit like shooting at cloth.

eddieroger•1mo ago

I think the little tears were fine, but my expectation of the weight of the cloth wasn't so much that it would start to rip on its own after a certain point. It felt more like a wet dough at a certain point than cloth.

jan_Sate•1mo ago

Looks like that I can cut it without right click by swiping fast enough.

taeric•1mo ago

First, kudos on this. Really cool to play with.

Reminds me of a great video not long ago that went over the main ideas behind weaving and knitting. Feels like you almost certainly have to take some of those ideas in mind when doing a simulation like this. Would be curious to read a breakdown of how this was made and how it incorporates the concepts that go into different fabric.

fiiisssh•1mo ago

There's actually really no knowledge of cloth involved, it's just a bunch of spring constraints: https://github.com/mkhan45/clothsim

AFAIK more advanced realism-focused cloth sims are still mostly bundles of spring constraints, and most fabric behaviors are encoded as different spring tolerances, forces, and friction.

Cloth self-collision and friction seem to be a very difficult problem in which progress has been made recently: https://graphics.cs.utah.edu/research/projects/ogc/Offset_Ge...

OptionOfT•1mo ago

I remember the first time playing Splinter Cell.

Walking back and forth through a curtain to see how it wraps around the body. So cool.

RankingMember•1mo ago

Pretty cool! I kept trying to cut the piece I had just cut again by doing a "Zorro"-style motion, but no such luck.

samcheng•1mo ago

This is great! The only part that broke the immersion (for me) was that the cloth bits fell at a constant rate - I'd expect them to accelerate due to gravity, and maybe flutter as they fell.

Nice art!

robertheadley•1mo ago

I wonder how far away we are from realtime Marvelous designer in games.

mrkramer•1mo ago

Reminds me of Fruit Ninja but this one is Cloth Ninja.

LyalinDotCom•1mo ago

I was curious and was able to build something very similar quickly using Gemini 3 via Google AI Studio. Never would have imagined a few years ago how easy some of this has become to prototype.

cyber_kinetist•1mo ago

There's a lot of simple cloth sim examples on the internet, so I see why LLMs can code these kinds of demos easily.

LyalinDotCom•1mo ago

yeah makes sense. Im sitting here evolving my little prototype its too much fun.

jcims•1mo ago

The 'Build' feature in AI studio has been pretty incredible for a few use cases I've thrown at it.

hoppersoft•1mo ago

I spent entirely too much time finding out exactly how much "cloth" could be supported by two "strings."

zenoprax•1mo ago

I'm going to assume it is "more than you think; not as much as you'd like" because I don't have the time to burn this morning to replicate your research.

cloudfudge•1mo ago

It's rust compiled to wasm. Dude's got a lot of interesting stuff on his projects page: https://mikail-khan.com/portfolio

jakemanger•1mo ago

That's super cool (and FAST -> hard to do from my personal attempts).

But, please, give us some nitty gritty of how you made it

fiiisssh•1mo ago

The repo is at https://github.com/mkhan45/clothsim, it's pretty compact and most of the relevant code is in src/main_state.rs

raylad•1mo ago

Feels more like a spiderweb simulation. The fibers are sticky and stretchy.

flet•1mo ago

I like it!

I made this a bit ago for fun and funnies to test the idea of tearaway ads. It's very prototype but still pretty satisfying (desktop only but there's a gif on the repo)

https://github.com/Flet/tearaway

sliken•1mo ago

Nice first approximation. The cloth has no momentum, a piece of cloth that clearly would swing down, past vertical, and then swing up just damps down and stops at vertical.

Also the falling pieces don't accelerate downward, which looks unnatural

xnx•1mo ago

Thought this was going to be a repost of https://oimo.io/works/cloth/, which is also excellent.

eternityforest•1mo ago

I wonder if cloth simulation could be integrated as a CAD primitive that somehow outputs reasonable BRep geometry?

Could you take an AI 3D scan of someone's face, virtually lay a heavy cloth over it, then add whatever you wanted to make a mask?

Could you make the deformed cloth surface into one side of a cube, where the other side was flat for easily working with it, and use that to make custom pseudo-vacumformed cases for things?

Or just stack up boxes and simple shapes, and use the cloth simulation to build organic looking industrial design within a more traditional CAD workflow?

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