[Sidefx-houdini-list] DOP's: 20,000+ cube wall

Andrew D Lyons tstexture at gmail.com
Mon Oct 18 13:01:11 EDT 2010


Yep.

1./ Put your box on the origin with no rotations.
2./ Bring it into DOPS. Use "Implicit box" as the volume mode.
3./ Point position DOP to create stack.
4./ On Solver try "RBD" solver engine and set Collision culling method to
"Implicit box".

Cheers


On 18 October 2010 09:54, Rick Fuentealba <ricardof at gmail.com> wrote:

> Ack, good luck with this in DOPs land.
>
> One of the things that can help "optimize" this is using RBD Point Object.
> If the objects are the same size, you can instance the same object over a
> point cloud, and with that you can also use simpler SDF collisions. Also
> writing out your SDF for your RBD objects is essential.
>
> And one way I'd recommend actually running the sim and writing it out, is
> via hbatch or hrender. That way you don't force Houdini to display.
>
> Hope this helps.
>
>
> On Sun, Oct 17, 2010 at 5:05 PM, Miles Green <Miles.Green at al.com.au>
> wrote:
>
> > Doh as text only version:
> > ------------------------
> >
> >
> > Hi,
> >  we're trying to create huge wall of cubes that collapses after a basic
> > collision with a sphere..
> >
> > The problem is after 20,000 cubes ODE just crashes with a Segfault on
> > our 64bit linux v10.5 houdini (it does not seem to be an out of memory
> > issue). Looking at a few threads on the forum it seems that others have
> > experienced this too.. so currently our workarounds are :
> >
> > 1) to spit the simulation into chunks of columns and reading subsequent
> > chunks as passive collision objects, but this has the problem of getting
> > the walls to interact with each other properly,  i.e at the sides of
> > each column having no bricks to collide with means the cubes are free to
> > move without resistance
> >
> > 2) try houdini 11, hope the crashing goes away
> >
> > 3 ) or swap to the open source bullet implementation...  although so far
> > with this I find the wall can't self stand, and the bricks seems to push
> > each other away (its like they want to move away from each other)
> >
> > any DOPS guru's out there have any handy tricks up their sleeves..
> >
> > thanks
> >   Miles
> >
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Andrew D Lyons | Digital Artist | http://www.tstex.com
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