[Sidefx-houdini-list] Smorganic

Louis Dunlevy louisdunlevy at gmail.com
Tue Apr 20 02:17:42 EDT 2010


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
>>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>>
>>>       
>> _______________________________________________
>> Sidefx-houdini-list mailing list
>> Sidefx-houdini-list at sidefx.com
>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>
>>     
> _______________________________________________
> Sidefx-houdini-list mailing list
> Sidefx-houdini-list at sidefx.com
> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>   




More information about the Sidefx-houdini-list mailing list