[Sidefx-houdini-list] Smorganic

Ozgur Yılmaz eoyilmaz at gmail.com
Sat Apr 24 07:12:43 EDT 2010


is point cloud given me a sorted set of points according to my query
position, or is it completely random?

E.Ozgur Yilmaz
Lead Technical Director
www.ozgurfx.com


On Tue, Apr 20, 2010 at 9:17 AM, Louis Dunlevy <louisdunlevy at gmail.com>wrote:

> I seem to remember there's a couple of per-particle attributes you can
> whack in there to fade in the effect of the solver on yer nice new
> particles... should be in the helpcard for the specific solver.
>
> Beers
> L
>
>
> Ozgur Yılmaz wrote:
> > jiversen, because I'm so new to the DOPs thing I can't really measure the
> > value of that RFE for now, should be something awesome.
> >
> > paul flanagan, thank you for your advice I will definitely look at that
> > example.
> >
> > alright, let me sum up what I have done last night. I was not able to
> > calculate the divergence by using the Gas Analysis node, I think the tool
> is
> > for volume fluids. And I tried to use Gas Particle to Field node to get a
> > volume representation of my particles, with no success. So I left the DOP
> > context and done the rest in SOP.
> >
> > Because the particle had all the information about the state of the fluid
> at
> > the particles position it was relatively easy to calculate the divergence
> of
> > every single particle. I've used point clouds to gather the information
> > about a particle and its environment which is needed to calculate the
> > divergence.
> >
> > But there was a subtle error ( may be bigger than subtle ), there is a
> > smoothing kernel term which I need to use while calculating the
> divergence
> > to add the influence of a nearby particle. The problem is, I don't know
> how
> > to change the point clouds interpolation so it matches the smoothing
> kernel
> > of the fluid nor how to iterate over every single particle that the point
> > cloud gives me. And actually there is another problem, I don't know what
> > smoothing kernel Houdini has used. May be it is related with the
> simulation
> > method parameter which is currently set to Runge-Kutta 3(2).
> >
> > Anyway, I calculated a divergence vector and used its length as the
> > divergence value at that position, then I grouped the particles with
> > relatively high divergences ( around 0.001-0.01 ) and used them as source
> > for new particles which led me to explosions again.
> >
> > I need to progress by first approving that I have a correct divergence
> > value. Than I need to change the way I calculate the source positions for
> > new particles.
> >
> > So I'll let you now if there is any good news.
> >
> > Cheers
> >
> > E.Ozgur Yilmaz
> > Lead Technical Director
> > www.ozgurfx.com
> >
> >
> > On Tue, Apr 20, 2010 at 1:31 AM, paul flanagan <paulflan at gmail.com>
> wrote:
> >
> >
> >> hey Ozgur,
> >>
> >> if your very new to Houdini particle fluids id recommend you load up
> >> the GrogSplash example file  have a look how its meshed etc.... its in
> >> the docs..  just a thought.
> >>
> >> p,
> >>
> >> On Fri, Apr 16, 2010 at 2:56 AM, Ozgur Yılmaz <eoyilmaz at gmail.com>
> wrote:
> >>
> >>> is there any idea how to do a similar effect with houdini particle
> >>>
> >> fluids:
> >>
> >>> http://www.fusioncis.com/pr_smorganic.html
> >>>
> >>> E.Ozgur Yilmaz
> >>> Lead Technical Director
> >>> www.ozgurfx.com
> >>> _______________________________________________
> >>> Sidefx-houdini-list mailing list
> >>> Sidefx-houdini-list at sidefx.com
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> >>>
> >>>
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