Banner Rollout - nCloth problem

#1

I’ve been trying to create a banner rolling down, so I start with a rolled in plane, then I transform-constraint the top row of vertexes, then I try to simulate it.

Everything kinda works, but I have one problem, and that is that the banner doesn’t stretch to be long enough. If I try to turn down the stretch resistance it will get long enough, but then it’ll bounce like crazy, and I don’t really want it to stretch, I just want it to unroll to it’s original length.

I’ve uploaded an example video here:
[VIMEO]81988472[/VIMEO]

I’ve uploaded the file here (maya 2014): planeRollout.mb

Any tips would be greatly appreciated!

#2

You rolled up your banner in a method that has the inner segments shorter… that’s the actual length of your banner given the start shape.

A workaround without needing to do a different rollup is use the unrolled shape (on right) as a rest shape. Select the rolled up cloth and the plane on the right then do “nMesh:Rest Shape: Connect selected mesh to rest shape”. The inner part will think its under compression, so to avoid strong forces make the compression resistance just 1… you could animate it getting stronger after the banner unfurls if desired. As well make selfCollisionFlag full surface and selfCollideWidthScale 1. make the Damp 0 and instead set the stretch damp to something like 2 to avoid bouncing.

It might also help to make the friction less than 1.0. This will make it easier for the roll to uncoil internally as the inner part attempts to expand.

#3

Duncan: Thank you so much Duncan! Great explanation, it worked! :smiley: I really appreciate your help mate :slight_smile:

#4

Just one small question, is there some way to stop it from compressing to the side? If I adjust the compression it affects the way the plane rolls down (as you said), but if possible I would like to just define the compression to the sides, is that possible?

I’ve attached an example picture:

Image

#5

Or go all the way and do it like this :smiley:

https://vimeo.com/26032273

#6

Duncan does this method require that the cloth objects have the same topology?

#7

Yes.

But I’m no Duncan :wink:

#8

hah thanks!

#9

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