[Sidefx-houdini-list] Simulating long hair with Houdini

Peter Bowmar pbowmar at gmail.com
Tue Nov 27 13:39:50 EST 2007


Yes, in all the cases I know of directly, for film work, the hair
dynamics were custom-written in-house. Having said that, I have had
success with the Wire solver for drool :) My experiments attempting to
make hair (on a Torus) were successful, but I wasn't too concerned
with the speed. The flexibilty was a lot more important :)

Having said that, I've found when SESI receive test cases of things
either not working or going too slow, they're good about making
improvements so don't suffer in silence!


Peter B

On 27/11/2007, Marc-Andre Carbonneau <marc-andre.carbonneau at ubisoft.com> wrote:
> Thanks Andy and Peter for your replies...
> I'm surprised only two people replied, I thought Houdini would be used often to create long hair due to it's dynamic simulation reputation.
> I'm suspicious studios actually develop their own dynamic tools when it comes to hair. I read they wrote one for Beowulf.
> I'll keep fiddling around in Houdini, see if I can lower the solving time.
> Cheers,
> -----Original Message-----
> From: Andy Boyd [mailto:andy at methodstudios.com]
> Sent: November 26, 2007 5:30 PM
> To: sidefx-houdini-list at sidefx.com
> Cc: Marc-Andre Carbonneau
> Subject: Re: [Sidefx-houdini-list] Simulating long hair with Houdini
> Hi
> I'm finding the same thing on long or short hair. I am using the DOPs
> wire solver to simulate the dynamics on the hair on my object and I'm
> finding it very slow.
> To compare speeds I did a test...houdini vs. maya
> I created the same setup in maya and houdini - a torus with 900 curves
> each with 4 points. There was no collisions on either set up. To play
> through 50 frames in maya took 24 seconds, in houdini it took 90
> seconds!!! that more than 3 times slower.
> I've attached both scenes for you to look at. I've emailed support these
> scenes, hopefully they'll recommend a faster setup or just make the
> solver faster:)
> Even thought houdini is slower the plus side of being procedural makes
> it worth the longer simulation for what I'm doing. Pity it can't be
> better and faster!
> Andy
> Marc-Andre Carbonneau wrote:
> > Hi there,
> >
> > First email here! I just started learning Houdini.
> >
> > I'm evaluating the possibilities of using Houdini in production but I'm finding it to be very slow even with few hair guides and as little segments as I can afford.
> > Does anyone use Houdini to simulate long hair for feature films or such high-quality product?
> >
> > Any advice, tricks or recommendations?
> >
> > Thank you
> >
> > Marc-André Carbonneau
> > VFX artist
> > Ubisoft Digital Arts
> > Montréal
> > 514.490.2000 x:3443
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