[Sidefx-houdini-list] Fast moving smoke?

Sam Klock klock.sam at gmail.com
Fri Nov 15 22:41:14 EST 2013


To default auto resize container completely fails at fast moving objects
for multiple reasons. You should never use the stock one with sims that are
either moving through space quickly or emitting lots of vel/divergence into
the sim. More than likely it will fail for these cases.

Sam


On Fri, Nov 15, 2013 at 10:49 AM, Craig Hoffman <craigleehoffman at aol.com>wrote:

> Yes, and enabling and multiplying velocity on the other tab to be a little
> higher.
>
> It is necessary to make it work (why isn't it on as default?!?) but
> default container auto resize doesn't work well for fast moving sources (I
> disable and it seems to work as expected..) and you need to crank up
> subsamples.
>
> Also scale doesn't seem to work as expected (making units 1 m vs .01m)
> doesn't seem to act as I would expect for the big change in scale.
>
> Thanks,
> -craig
>
> -----Original Message-----
> From: "Tony Atherton" <tony_atherton at hotmail.co.uk>
> Sent: 11/15/2013 7:44 AM
> To: "sidefx-houdini-list at sidefx.com" <sidefx-houdini-list at sidefx.com>
> Subject: Re: [Sidefx-houdini-list] Fast moving smoke?
>
> Hi Craig,
>
> Have you had a look at the motion blur tab on the fluid source node. I
> find this can be useful when you need to create a smooth emitter from a
> fast moving object.
>
> Cheers,
>
> Tony
>
> > From: jclark2900 at gmail.com
> > Date: Thu, 14 Nov 2013 09:30:37 -0800
> > To: sidefx-houdini-list at sidefx.com
> > Subject: Re: [Sidefx-houdini-list] Fast moving smoke?
> >
> > Hey Craig,
> >
> >  this should help get you part way there. I agree, it would be awesome
> for
> > something like this to be a standard setup!
> >
> > http://forums.odforce.net/index.php?/topic/17266-smoke-trail-on-path/
> > http://vimeo.com/61015448
> >
> >
> > On Thu, Nov 14, 2013 at 9:18 AM, Craig Hoffman <craigleehoffman at aol.com
> >wrote:
> >
> > >
> > >
> > > Hi everyone,
> > >
> > > I am struggling to make a super fast moving object leave a nice smooth
> > > smoke trail using Pyro FX smoke- think something like a jet leaving an
> > > exhaust trail.
> > >
> > > Are there any good hints to make this work reasonably fast without
> leaving
> > > behind discreet puffs or just brute forcing it with DOP substeps?
> > >
> > >
> > > Also, I think it would be great if Sidefx made a Pyro Shelf tool that
> > > works well for fast moving objects since right out of the box none of
> the
> > > tools seem to be able to handle that well.  And it is really hard to
> find
> > > information on the proper way to set container resizing or utilize
> velocity
> > > from the source in an expected manner for fast moving objects
> > >
> > > Thanks,
> > > Craig
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