[Sidefx-houdini-list] cloth sim possibilities

David Johnson daveinengland at gmail.com
Thu Oct 2 12:36:04 EDT 2008


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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