[Sidefx-houdini-list] reducing dops simulation time

Simon Barrick simon at primalpictures.com
Fri Apr 13 04:51:17 EDT 2007

Have you tried the RBDautofreeze tool? I don't know if it will speed up
your sim but it should bring it to rest at least.


-----Original Message-----
From: sidefx-houdini-list-bounces at sidefx.com
[mailto:sidefx-houdini-list-bounces at sidefx.com] On Behalf Of Velazquez,
Sent: 13 April 2007 00:56
To: sidefx-houdini-list at sidefx.com
Subject: [Sidefx-houdini-list] reducing dops simulation time


I was wondering if anybody had any useful tips for reducing dops
simulation times. My dops simulation is actually pretty straight
forward. I have a bunch on spheres that move around and interact with
one another. They never stop moving. One optimization I found was the
"implicit sphere" for the sdf representation. Another is "sphere" for
the culling method in the rbd options. Other than that, I'm kinda stuck.
Dops doesn't seem to do sdf->sdf collision detection that I know of. So
I'm stuck 
each point in the sphere with the sdf of nearby spheres.  With the
potential of thousands of spheres, my simulation times are becoming
unworkable. Seems like there should be a built-in optimization for using
spheres since collision detection between spheres is pretty

thanks for any suggestions.


 Cesar Velazquez                   Walt Disney Feature Animation 
 FX Animator                           500 S. Buena Vista Street 
 cesar.velazquez at disney.com                        Mailcode:4870 
 818-460-8797                             Burbank, CA 91521-8965

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