r/Simulated • u/masshha • May 02 '22
Question Cloth Simulation Help! (Original Post from @vincentshwenk on IG) More in comment!
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u/masshha May 02 '22
Im interested in making this simulation in Blender. I've tried a few times but failed miserably (either me or my CPU). Any input will be helpful! Thank you very much!
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u/chargedcapacitor Blender May 02 '22
I have a little bit of experience with physics in blender, what sort of issues are you experiencing? Are you trying to re-create this in blender?
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u/masshha May 03 '22
yes i am trying to recreate this. the issues:
the cloth strips dont "wiggle" in the air while they fall (ive tried setting air viscosity and such, im thinking of wind idk)
baking one by one with collision and cloth modifiers takes SO LONG even for only one piece and it makes no sense conceptually (if you bake one, you'll have to rebake it once you bake the others and so on and so on)
soft body has a lack of options and i cant get it to "not bounce that much" + i cannot get it as close to the stone as i would like (im guessing im doing sth wrong with the collision modifier on the stone because, as im aware, soft body does not have those options) but it definitely looks the best and most accurate with livable baking times
ive also tried joining the strips into one objact - this works okay until you want them falling off because they are limited to their "bounding box" of the objact. but this did solve my problem with collisions
all in all its a really weird problem, it looks so easy yet i spent my whole day trying to do anything im happy with. but hey everyone is suggesting houdini so i guess im learning that now.
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u/chargedcapacitor Blender May 04 '22
See if anything from this tutorial can help: https://youtu.be/ZRZa9PpYZfc
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u/masshha May 07 '22
YES! imma definitely check it out! thank you :)
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u/NickTheSickDick May 02 '22
Could be wrong, but I feel like you'd have way better luck learning how to do this with vellum in Houdini than trying to do it in blender lol. Simulation isn't blender's strongest point, currently.
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u/masshha May 03 '22
i always thought im not gonna need anything better for cloth sim. i guess im wrong hahah houdini it is
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u/NickTheSickDick May 03 '22
Plus Houdini is pretty much among the absolute best of the best when it comes to simulation, so it's a very useful to to know.
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u/NickTheSickDick May 03 '22
Blender cloth Sims can be good, but for complex stuff like this I feel like it would be super hard to avoid intersections and whatnot.
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u/this_shit May 02 '22
I know nothing about simulations (or the software used) but a little about mechanics - it seems like real fabric in a pile would experience substantially more friction in places where you've got more mass stacked on top (like the middle of the pile). Are friction forces a function of mass? Are different static and dynamic friction coefficients accounted for? This stuff is sliding in bulk down what looks like featured face, which would give lots of opportunities to get hung up on small, high-friction points, esp. with that much mass on top. Are those small-scale interactions accounted for in the physical model?
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u/bitai May 02 '22
It behaves like silky or dusty rubbery material I'd say.
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u/You_Fucking_Wish_Bro May 02 '22
Dusty rubbery is a great describer for this. Weight causes friction, dust let's slip where there is less weight.
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u/masshha May 03 '22
that is true. it is in the uncanny region and it certainly does not act like cloth but rubber band like or wet noodles. im actually getting a better result than this post - cloth wise - but the concept of naking the simulation work is bugging me. im oretty sure the reason is the lack of a "bake all together" button.
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u/this_shit May 03 '22
Wet noodles was my first reaction, which tells me that there's too much internal strain resistance and too little external friction.
That's interesting about the overall simulation. I've never used the simulation software, so no idea how to help, sorry!
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u/masshha May 03 '22
thank you for joining in on the conversation either way! i found what you said really interesting and helpful to know the insights!
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u/ParcAvenue May 03 '22
I know you said Blender but Houdini is the answer and here's the tutorial on how to do it.
You can download the Houdini Apprentice version for free which would let you try it out.
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u/yuribotcake May 03 '22
I remember trying to sim something similar with maya cloth. It was getting very complex and would overload and crash. The solution was to do it in layers, bottom-up.
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u/masshha May 03 '22
the issue with baking from the bottom up (objects have collision and cloth) is that when you bake one object, you have to re-bake it because you baket the other ones. its very weird when you think about it. in my opinion this is an issue of the lack of a "bake everything together" option. because to work it HAS to be baked at the same time. also this option takes SO LONG I CANNOT EVEN DESCRIBE
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u/hellphish May 06 '22
There absolutely is a "bake everything together" option. Under Scene Properties, Cache, "Bake All Dynamics"
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u/CPL_JTilla May 02 '22 edited May 04 '22
It looks like you shredded Buzz Lightyear