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

Marc-Andre Carbonneau marc-andre.carbonneau at ubisoft.com
Tue Nov 27 13:32:17 EST 2007

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.


-----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

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!


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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