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Virtual World Dynamics F.A.Q (Last Updated: 2024 Sep 21 11:29 am)




Subject: Steps to Cure exploding cloth


headwax. ( ) posted Tue, 25 July 2017 at 7:26 PM · edited Sun, 06 October 2024 at 5:40 PM

Hya, sometimes I have a cloth that settles down for a minute then goes shooting off into hyperspace. At first I thought it was because there was too much poke through with the collision target.

But that doesn't seem to be the case with this one. I'm pretty sure I have self collision off.

I wonder what steps I should look at to fix it - thanks in advance.


headwax. ( ) posted Tue, 25 July 2017 at 7:47 PM

oh the cloth had an inner lining which I made invisible - but still same problem.


VirtualWorldDynamics ( ) posted Wed, 26 July 2017 at 5:41 AM

Hello, could you give the name of the cloth on which you have this issue. Some clothes and many hair have some inner parts that create a very dynamic movement at the beginning of the simulation or a unwanted stress. Dynamic clothes never have these errors. To correct this issue, the best way is to :

  • Make a first static simulation without the inertia. This simulation will repel the "bad" vertices outside the collision actor.
  • Press on the "Send pose to Host".
  • Rename the "_VWD" dynamic element. "Object_VWD" to "Object_NEW" for example.
  • Make a second dynamic simulation using your previous settings.

I hope this will help you to resolve your issue.

____________________________________________

Follow me on Twitter : @VWDynamics

Watch demo videos on Youtube


headwax. ( ) posted Wed, 26 July 2017 at 6:47 AM

Thanks for that advice! One of them was a simple dress I made myself with creases and folds. I'll check what the other was.

Cheers :)


dzonatan ( ) posted Fri, 18 August 2017 at 3:13 AM

I recall having the same problem with MMD Hair models converted to OBJ. Increasing collision distance might do the trick.


VirtualWorldDynamics ( ) posted Sun, 20 August 2017 at 4:28 AM

Hello dzonatan, your problem is now resolved? If you want, you can tell me a model on which you have an issue. I could make some tests and then, give you my settings.

____________________________________________

Follow me on Twitter : @VWDynamics

Watch demo videos on Youtube


dzonatan ( ) posted Sun, 20 August 2017 at 5:40 AM · edited Sun, 20 August 2017 at 5:46 AM

Here's the hair OBJ https://ufile.io/5ywv9

DO NOTE that it's a MMD ripped model that you have to manually adjust in order to align it properly.

Personally I use it on Genesis with modified AIko Shapes for anime look.

I get the best result with the following:

Collision Object:

Collission distance 0.2

default friction

no subdivide

Hair Object:

Stretch 0.01

Softness 0.01

Self method By Normals

use extension

extension count 6~8 (depending on how dense the mesh is or if I bothered to decimate it)

softness 0.01

use neighbourhood

distance 0.5

softness 0.01

After presing Show Hair verices I go:

Selection Distance 0.5

Softness 0.01

Self colission by extension

and perhaps rigidify/inflate if it looks like a flat tire.

The results are so so but I'd like to have the hair behave like it does in these videos

https://www.youtube.com/watch?v=VqAomocVWGE (NSFW)

https://www.youtube.com/watch?v=s4tOJK5n-JU

https://www.youtube.com/watch?v=ogrCKvRoqLM

If you can achieve it then that would be grand!


VirtualWorldDynamics ( ) posted Sun, 20 August 2017 at 11:40 AM

I made two tests.

The first one will be too smooth for you because the hair almost behave like real hair. The second one seems correct but I don't know if this corresponds to your wish. My settings are not so different as yours.

I send a link to two videos and two RIP files that correspond to the simulations. https://drive.google.com/open?id=0B9c39Rz2Ec-JWG9ELTBKS0JESUU

Could you send the results you had by using your settings?

____________________________________________

Follow me on Twitter : @VWDynamics

Watch demo videos on Youtube


dzonatan ( ) posted Sun, 20 August 2017 at 6:16 PM · edited Sun, 20 August 2017 at 6:21 PM

Really like the second result although it could be just a little bit more stiff. Still it's much better compared to what I was to create.

How do you handle those RIP files?


dzonatan ( ) posted Mon, 21 August 2017 at 2:27 AM

EDIT: nevermind I found the Recorded Imports folder.

I'll now do two tests with my settings and yours and see which place I could make it better.


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