[Sidefx-houdini-list] cloth sim possibilities

David Johnson daveinengland at gmail.com
Wed Oct 1 20:57:54 EDT 2008

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.


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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