[Sidefx-houdini-list] cloth sim possibilities

Larry Giunta larry at gcreativestudios.com
Thu Oct 2 14:47:02 EDT 2008


ahhh .......... that was a huge help.

I was playing with animated drag but neglecting to "Set always".  
doh ..........

yeah, that goes a long way in helping to settle things down when the  
cloth begins to gather on the floor.
Big, big difference ......... thanks!!

Larry


On Oct 2, 2008, at 12:35 PM, David Johnson 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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