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

Rick Fuentealba ricardof at gmail.com
Mon Oct 18 12:54:41 EDT 2010

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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