[Sidefx-houdini-list] sand inside glass container

David Johnson daveinengland at gmail.com
Wed May 2 11:54:16 EDT 2018


That's a really nice piece. I love that film. Nice job!

On Wed, May 2, 2018 at 8:45 AM, Marco Melantonio <mmelantonio at gmail.com>
wrote:

> Hi Gerbrand.
>
>
> I just did a shot like that but unfortunately they changed the camera to a
> closeup shot and we don't had time to increase the resolution due the
> dealine..
> https://vimeo.com/267591296
>
> But the collisions worked fine.
>
> The mainly issues that we had were:
>
> - The girl animation was to fast, so I had to increase gravity and sub
> steps a lot (6 to 7 times I guess)
> - The final sand resolution must be ridiculous high. We tried to use Sand
> Upres, but it has limitations...
> - I was expecting a bounce of sand particles when the girl hits the ground
> but I couldn't find a way.
> - I tried to render a UpRes sim inside Maya using Houdini Engine, but 64Gb
> of memory wasn't enough.
>
> Pay attention to your scene scale.
> Tweak your collisions like when simulating flip fluids.
>
> I migrate to Houdini a year ago and that was my first time using the grain
> solver, so probably there are more things that I missed.
>
> There is a high resolution sand simulation baked to switch, but we are
> trying to render. Probably we will have to render in Houdini using Mantra
> because Maya with Arnold are crashing every try.
>
> Any tips with this would be great too!
>
> Good Luck
>
>
>
> Marco
>
> 2018-04-20 0:54 GMT-03:00 Gerbrand Nel <g at cannonballbunny.com>:
>
> > Hey guys.
> > I need to do a shot where an hourglass filled with sand, falls and breaks
> > on the floor.
> > Anyone have tips or know of tutorials that might help?
> > I'm finding it hard to get the sand to stay inside the container while
> its
> > falling.
> > Any help or tips will be much appreciated.
> > Thanks so much
> > Gerbrand
> >
> >
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