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Cloth modifier problem
show user profile  twistedpancreas
Hi there hopefully this is something small and won't waste your time too much.

I've got a character with a gown on (it's a animation for nursing students and how to wash old patients, so don't get too excited :P), and i've a test gown and then used the Cloth Modifier on it.

Problem is when the character moves their arm the whole gown starts moving with it, see images below. Can I use Groups in the Sub-Object area to select certain gown vertices to certain character areas? Or is there some other way to make the bottom of the gown not follow the arm?

Thanks in advance,

Yorz Trooly,

Pancreasboy http://www.twistedpancreas.com


read 945 times
2/17/2009 10:05:58 PM (last edit: 2/17/2009 10:05:58 PM)
show user profile  twistedpancreas
you won't believe this but after coming back into work this morning (my first post was from yesterday), and reopening the file it now wants to work, eg

]

But if i erase the simulation and try to simulate it again, it starts mucking up again (ie bottom of gown follows hand)

So I try restarting Max but it still mucks up.

And when I restart the machine it seemed to fix it up. So I'd be interested how it works at your end.

So I've uploaded the file here...
http://www.twistedpancreas.com/3d/scene1_clothTest1.max.zip

Now my original file with another character in it is 43Mb so i dunno if that's mucking things up too.

Also when I opened the file it also moves the gown a bit backwards.

And the problem I've been having with making the gown more detailed (ie adding more illiterations to Meshsmooth, or Tessellating the Polys) is that when I hit Simulate it's like the dialogue box flicks up then disappears and then does nothing or gets to a certain frame and sits there for a while and then does nothing (vaguely i remember reading this somewhere that it might be vertices intersecting and screwing up the calculation but i cant remember where i read that).
Yorz Trooly,

Pancreasboy http://www.twistedpancreas.com


read 907 times
2/18/2009 5:24:20 PM (last edit: 2/18/2009 5:24:36 PM)
show user profile  Octopuzzy
First thing I'd do is lower the poly count on your human mesh to about 1/10th of what u have now and bring up the cloth poly count to a lot more..seems like u got it backwards.
That can possibly solve some problems right away. If not, it will at least speed everything up and get u more details into the cloth.




read 883 times
2/19/2009 1:12:48 AM (last edit: 2/19/2009 1:12:48 AM)
show user profile  twistedpancreas
yeah i just got myself re-educated in cloth from these 2 movies:
http://usa.autodesk.com/adsk/servlet/item?siteID=123112&id=5903982

got another question now though,

how can i keep the gown closed at the centre (i tired a tiny join but the problem is i need the gown to open later on), is there some way to use groups to hold to the other side of the gown and then release sometime later in the animation? See image below:

Yorz Trooly,

Pancreasboy http://www.twistedpancreas.com


read 858 times
2/19/2009 9:24:35 PM (last edit: 2/19/2009 9:24:50 PM)
show user profile  twistedpancreas
after a bit of fiddling around I'm slowly getting there but still having problems with keeping the gown closed until it needs to be removed.

See my file herehttp://www.twistedpancreas.com/3d/scene2_018.max.zip

Any ideas on how I can keep the gown closed but still look natural on the body?
Yorz Trooly,

Pancreasboy http://www.twistedpancreas.com


read 786 times
3/1/2009 10:27:37 PM (last edit: 3/1/2009 10:27:37 PM)
show user profile  markoid
File failed to open... must be 2009 huh?



read 774 times
3/2/2009 2:21:47 AM (last edit: 3/2/2009 2:21:47 AM)
show user profile  twistedpancreas
yeah sorry 2009, I should have noted that.
Yorz Trooly,

Pancreasboy http://www.twistedpancreas.com


read 752 times
3/2/2009 3:32:46 PM (last edit: 3/2/2009 3:32:46 PM)
show user profile  twistedpancreas
ok it finally clicked with me how to stop the gown sticking to the characters hands sometimes

ie I made a group on the gown's waist downwards and another group on the character's hands. Then on the hands group I made them NoCollide with the waist group as shown below.

This still doesn't solve my opening gown problem, but I think I just might have 2 versions of the gown (one closed, the other in a state where it can be opened and maybe cut the camera to another angle when going to the gown coming off)

I might try the Surface Group as a last ditch effort, I'll update you on my progress.
Yorz Trooly,

Pancreasboy http://www.twistedpancreas.com


read 730 times
3/3/2009 9:22:34 PM (last edit: 3/3/2009 9:56:48 PM)
show user profile  twistedpancreas
Actually can you animate a seam breaking apart?

If so maybe I could do that?
Yorz Trooly,

Pancreasboy http://www.twistedpancreas.com


read 702 times
3/4/2009 9:50:09 PM (last edit: 3/4/2009 9:50:09 PM)
show user profile  Jollabollathan
There is a way to do this, and I even saw a video on Youtube a while ago explaining exactly how, but...I just can't find it again. :( Sorry. It's something along the lines of making lots of groups along the length of where you want it to split, maybe having the thing split to start with and assigning each of those groups to stick to the other side, then one by one animating them to come apart. I have no memory of exactly what type of group does this and cloth is entirely impenetrable to me so I can't figure it out either. You won't get a completely smooth split without making a group for every pair of connected vertices but it gets the job done. Hope you can figure it out.

read 692 times
3/5/2009 6:11:12 AM (last edit: 3/5/2009 6:11:12 AM)
show user profile  twistedpancreas
well it seems (hehe get the pun) that you do have a group which holds the verticies of the open edges of the gown, then click the Cloth button and select the gown. This keeps the gown pretty much closed until later on when you animate that group "off" to open up the gown.

Was this the movie you were thinking of?
http://www.joegunn3d.com/Tuts/ClothPullApart.htm

It was helpful too.

I've now documented my experience here http://www.twistedpancreas.com/3d/maxHelp.htm#cloth, and am doing some final tests just to make sure, thanks everyone for the help.
Yorz Trooly,

Pancreasboy http://www.twistedpancreas.com


read 650 times
3/10/2009 5:15:15 PM (last edit: 3/10/2009 5:15:15 PM)
show user profile  Jollabollathan
Ah, yes! That's the video! Guess it wasn't on Youtube after all. Glad you're progressing, though.

read 646 times
3/10/2009 5:29:28 PM (last edit: 3/10/2009 5:29:28 PM)
show user profile  twistedpancreas
one last (hopefully) thing,

is that after 800 frames the left arm has somehow popped out of the arm sleeve and into the gown itself. Is there some value I should be adjusting to better keep the arm in the sleeve, or is the collision of the sleeve with the gown mucking up?

Yorz Trooly,

Pancreasboy http://www.twistedpancreas.com


read 605 times
3/15/2009 9:22:59 PM (last edit: 3/15/2009 9:22:59 PM)
show user profile  Jollabollathan
I'm guessing it's just getting a bit stressed out around the armpit area which is leading to weird problems elsewhere, or something.

You may have to do more fiddling with groups to make them not collide with eachother. Reducing the cloth thickness or increasing the samples per frame may help, too, but sometimes these things are just luck. :|

read 580 times
3/16/2009 6:04:19 AM (last edit: 3/16/2009 6:04:19 AM)
show user profile  twistedpancreas
yeah I'm about to lose the plot.

i've attached a heap of screenshots because the file is too large (33Mb, unless yr keen to download a file that big) to show you the problems I'm having, but basically the arm is still not staying within the sleeves, even though I've done things like make sub samples 50!!! and adjusted the offset, depth, i couldn't use Behaviour Settings > Self Col or Use Soft Selection within the groups because the cloth would just remain in it's initial position and just fall on the character.

So heres a screenshot of the problem I'm thinking is happening, the character starts in a sitting position, but the arms are intersecting with the bottom of the gown (i need the arms in this position because the character is sitting in a narrow chair).

Then here's the problem, when the character gets up and starts walking off the sleeves have gaping holes, which later will cause problems as i take the gown off (ie they get caught around the wrist).

I've attached more screenshots here with all the settings I thought I'd need to show you...

So this is my last desperate attempt to get this working, cause if this doesnt work, i'm off back to the farm to live the rest of my days as a ludite :P

:)
Yorz Trooly,

Pancreasboy http://www.twistedpancreas.com


read 527 times
3/19/2009 3:49:33 PM (last edit: 3/19/2009 3:51:03 PM)
 
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