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Erkan Özgür Yılmaz
Saturday, 24 April 2010 Sat, 24 Apr '10
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 Y?lmaz 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 Y?lmaz <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 > _______________________________________________ Sidefx-houdini-list mailing list Sidefx-houdini-list at sidefx.com https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list