[Sidefx-houdini-list] cloth sim possibilities

David Johnson daveinengland at gmail.com
Thu Oct 2 18:53:23 EDT 2008


I haven't seen anything like that for cloth. When all the forces are
balanced, it should stop, but it will continue to solve I think. That's a
good question for support.

Dave

On 10/2/08, Larry Giunta <larry at gcreativestudios.com> wrote:
>
> so, I guess one last question just to wrap it all up.
>
> Is there an equivalent to the RBDautofreeze node for cloth???
> Something that will help bring it all to a complete rest.
>
> I realize I can probably deal with this by blending to a static rest
> position back in SOPs.
> But it seems like it would be handy to have in DOPs in certain
> situations.
>
> However, maybe I'm missing and obvious option.
>
>
> Larry
>
>
> On Oct 2, 2008, at 12:36 PM, David Johnson wrote:
>
> > Oh, and also, check your damping settings if things seem to be
> > destabilizing.
> >
> > Dave
> >
> > On Thu, Oct 2, 2008 at 9:35 AM, David Johnson
> > <daveinengland at gmail.com>wrote:
> >
> >> Using a bit of drag can help to calm down energy in cloth. When
> >> using drag,
> >> you can do a number of things to get some extra control...
> >>
> >> Go ahead and set the Force Scale high to see if that does what you
> >> want.
> >> Also, if you set the torque scale to 0, you won't get any drag on the
> >> rotation of things. If you want to animate the amount of drag,
> >> make sure you
> >> set the mode for the Scale Force to "Set Always".
> >>
> >> Dave
> >>
> >>
> >> On Thu, Oct 2, 2008 at 7:40 AM, Larry Giunta
> >> <larry at gcreativestudios.com>wrote:
> >>
> >>> Thanks Dave. This is actually a lot to go on.
> >>>
> >>> I think I was on track with most settings ( and the version of H9.5
> >>> we're working with).
> >>> But tweaking that thickness setting really seems to help get some
> >>> control over the self intersecting problems.
> >>>
> >>> I still get a lot of hyper energy within the surface when turning
> >>> self intersecting on. So I guess I'll just have to play around with
> >>> some other setting to see if I can get that to settle down a bit.
> >>>
> >>> Thanks again. As everyone knows this stuff is slow to experiment
> >>> with, so your advice was most appreciated.
> >>>
> >>> Larry
> >>>
> >>> --
> >>> Larry Giunta
> >>> Creative Director
> >>> G Creative Studios
> >>> (781)393-0200
> >>> larry at gcreativestudios.com
> >>> www.gcreativestudios.com
> >>>
> >>>
> >>>
> >>> On Oct 1, 2008, at 8:57 PM, David Johnson wrote:
> >>>
> >>>> First of all, you should be using hfs9.5.240 or greater. They have
> >>>> done a
> >>>> lot of work on cloth in that build.
> >>>>
> >>>> After that, the Cloth Thickness needs to be significantly smaller
> >>>> than the
> >>>> distance between any of the points in your starting geometry, or it
> >>>> will
> >>>> start in a self intersected mode.
> >>>>
> >>>> Next check that your damping is set well. I have been using it at
> >>>> about 1%
> >>>> of the stiffness value, but YMMV.
> >>>>
> >>>> If you are using drag to get the "floating in the air" effect, you
> >>>> need to
> >>>> play with the mass of the points. Lower mass is affected by drag
> >>>> more than
> >>>> higher mass. Also be aware that drag is sensitive to the normal of
> >>>> the poly
> >>>> that it is affecting. There is less drag on the points if the poly
> >>>> is moving
> >>>> tangent to it's normal.
> >>>>
> >>>> On your ground plane, set the bounce to be 0, since sheets don't
> >>>> really
> >>>> bounce much, and you can play with the friction too.
> >>>>
> >>>> Other than that, I don't know what to tell you.
> >>>>
> >>>> Dave
> >>>>
> >>>> On Wed, Oct 1, 2008 at 3:10 PM, Larry Giunta
> >>>> <larry at gcreativestudios.com>wrote:
> >>>>
> >>>>> Hello all,
> >>>>>
> >>>>> We're trying to get a piece of cloth to drop down and gather at
> >>>>> rest
> >>>>> on the floor.
> >>>>> Kind of like a sheet coming loose from a clothesline and
> >>>>> settling on
> >>>>> the ground.
> >>>>>
> >>>>> The main problem is that it intersects with itself a lot when it
> >>>>> gathers on the ground plane and begins to settle.
> >>>>> Self collision seemed to be the obvious answer but when that is
> >>>>> turned on the whole sim jumps and bounces around a
> >>>>> lot ......... even
> >>>>> before it hits the ground plane, but much more then.
> >>>>> Kind of interesting, but not what we're after.
> >>>>>
> >>>>> I'm wondering if we're missing some key settings
> >>>>> somewhere ..........
> >>>>> or if it's just a bit to ambitious to expect this to settle on the
> >>>>> ground without the surface intersecting.
> >>>>>
> >>>>> As always, thanks in advance for any thoughts.
> >>>>>
> >>>>> Larry
> >>>>>
> >>>>> --
> >>>>> Larry Giunta
> >>>>> Creative Director
> >>>>> G Creative Studios
> >>>>> (781)393-0200
> >>>>> larry at gcreativestudios.com
> >>>>> www.gcreativestudios.com
> >>>>>
> >>>>>
> >>>>>
> >>>>>
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