[Sidefx-houdini-list] water droplets running off the side of a bottle

Ron Schab ron.schab at gmail.com
Thu Jan 21 08:35:09 EST 2016


Congrats to getting it done in the given timeframe  :)




On Thu, Jan 21, 2016 at 11:24 AM, Olivier Jeannel <facialdeluxe at gmail.com>
wrote:

> Cool !
>
> On Thu, Jan 21, 2016 at 10:49 AM, Gerbrand Nel <g at cannonballbunny.com>
> wrote:
>
> > Thanks everyone!!!
> > Thanks to you guys, my client is happy.
> > I never got to the double cross product, the bottle is standing upright,
> > so a simple "move to centre in x and z" force made the drops stick to the
> > bottle just fine :)
> >
> > I started with the rain otl on orbolt, to get the trail spawning going.
> > I also spawned another trail with a life of 100 to generate a wetmap.
> > I used attribute transfer to extract the bottle geo around these
> > particles, and used some noise displacements on these for the water
> trail.
> > The same wetmap particles had a pscale of 0, so I used another attribute
> > transfer with a small radius, on the other droplets on the bottle, to
> fake
> > the absorption of droplets as the main drop travelled down the bottle.
> >
> > I didn't use the liquid surface sop, I couldn't figure out how to get it
> > to look at pscale, so I used a copy sop with spheres, and a vdb from
> > polygons to create the liquid surface.
> >
> > The scene is a mess, but I will gladly share it if anyone needs to do
> > something like this.
> > G
> >
> >
> >
> > On 20/01/2016 21:46, Personal wrote:
> >
> >> Great idea with cross product. Would never thought about that, I am so
> >> crap in math. But it works nice.
> >>
> >>
> >> --
> >> Micic Srecko
> >> -------------------
> >> Mail:
> >> srecko.micic at gmail.com
> >> Skype:srecko.micic
> >> -------------------
> >> On 19/01/2016 21:39:07, Olivier Jeannel <facialdeluxe at gmail.com> wrote:
> >> The double cross product can be copied from Softimage's "flow on
> surface".
> >> The principe is the same.
> >>
> >> If you want to use the SDF,inside Popvop you'll gather the distance from
> >> an SDF surface using a Volume_Sample (if the value is negative the
> >> particle
> >> is inside, if it is positive the particle is outside, and if it returns
> >> zero you're on the surface)
> >> You sample the direction (equivalent to the Normal but for an SDF)
> using a
> >> Volume_Gradient.
> >>
> >> Just be focused, and respect the cross product order and normalize
> >> everything.
> >> You'll end up with a plate of spagehties, but it works.
> >>
> >> On Tue, Jan 19, 2016 at 7:16 PM, Gerbrand Nel wrote:
> >>
> >> Thanks everyone!!
> >>> I shall try
> >>> found this one too:
> >>> https://vimeo.com/40954039
> >>> Bit over the top for my 1 day budget, but there are some nice ideas in
> >>> there.
> >>> G
> >>>
> >>> On 19/01/2016 19:49, Javier Meroño wrote:
> >>>
> >>> if you want a reusable tool for dripping droplets like this one
> >>>> https://vimeo.com/artkill/dropletsrnd
> >>>>
> >>>>
> >>>> then Olivier is right on the money, you need to force the particle
> >>>> trajectory with a POPVOP using a double cross product and afterwards
> use
> >>>> VDB volumes so that the droplets merge together properly . It´s not an
> >>>> obvious tool to create, though, and it will take some research and
> >>>> development on your side, so be sure it´s something you will reuse
> >>>> before
> >>>> going into it.
> >>>> Javier Meroño
> >>>>
> >>>> From: parker.jon at gmail.com
> >>>>> Date: Tue, 19 Jan 2016 12:03:42 -0500
> >>>>> To: sidefx-houdini-list at sidefx.com
> >>>>> Subject: Re: [Sidefx-houdini-list] water droplets running off the
> side
> >>>>> of a bottle
> >>>>>
> >>>>> How about scattering some points around your surface, then scatter a
> >>>>> separate group near the bottom of your object and use the
> >>>>> findShortestPath node to draw lines that connect them. The lines
> >>>>> should follow the contours of your object in a fairly realistic way
> >>>>> and you can then just animate the droplets to follow the curve paths,
> >>>>> no simulation needed.
> >>>>>
> >>>>> Jon
> >>>>>
> >>>>> On Tue, Jan 19, 2016 at 10:46 AM, Ron Schab wrote:
> >>>>>
> >>>>> jep particles or u can have a look at this thing here:
> >>>>>>
> >>>>>> https://www.orbolt.com/asset/SideFX::vfx_rain
> >>>>>>
> >>>>>>
> >>>>>> SideFx-made HDA that going of the description should offer what u
> are
> >>>>>> after. Haven't downloaded and tested, just remembered seeing it a
> >>>>>> while
> >>>>>> ago.
> >>>>>>
> >>>>>> At least should give u some ideas - it's free too
> >>>>>>
> >>>>>> good luck.
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> On Tue, Jan 19, 2016 at 4:25 PM, Olivier Jeannel
> >>>>>> facialdeluxe at gmail.com>
> >>>>>> wrote:
> >>>>>>
> >>>>>> Double cross product is the way to get some slide on surface based
> on
> >>>>>>
> >>>>>>> incoming velocity.
> >>>>>>> But there might be a pop doing that, already.
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>> On Tue, Jan 19, 2016 at 3:52 PM, Srecko Micic
> >>>>>>> wrote:
> >>>>>>>
> >>>>>>> And for moving particles, I did once similar with particle
> collision
> >>>>>>>
> >>>>>>>> POP,
> >>>>>>>> and Respond set to slide. But not sure will that work in your
> case.
> >>>>>>>> --
> >>>>>>>> Srecko Micic
> >>>>>>>> 3D Generalist
> >>>>>>>> -------------------------------------------
> >>>>>>>> Skype: srecko.micic
> >>>>>>>> Email: srecko.micic at gmail.com
> >>>>>>>>
> >>>>>>>> On Jan 19, 2016, at 3:04 PM, Srecko Micic
> >>>>>>>> wrote:
> >>>>>>>>
> >>>>>>>> Try to scatter particles on surface. And than use Particle Fluid
> >>>>>>>>>
> >>>>>>>>> Surface
> >>>>>>>> to mesh them, for example?
> >>>>>>>>
> >>>>>>>> --
> >>>>>>>>> Srecko Micic
> >>>>>>>>> 3D Generalist
> >>>>>>>>> -------------------------------------------
> >>>>>>>>> Skype: srecko.micic
> >>>>>>>>> Email: srecko.micic at gmail.com
> >>>>>>>>> http://sreckom.webworkman.com
> >>>>>>>>>
> >>>>>>>>> On Jan 19, 2016, at 2:21 PM, Gerbrand Nel <>
> >>>>>>>>>>
> >>>>>>>>>> wrote:
> >>>>>>>>>>
> >>>>>>>>> Hey guys
> >>>>>>>>>
> >>>>>>>>>> This one client called me and needs photo real droplets on a
> >>>>>>>>>> bottle
> >>>>>>>>>> by
> >>>>>>>>>>
> >>>>>>>>>> the end of tomorrow.
> >>>>>>>>> I've done this in softimage in the past, but I was wondering if
> >>>>>>>>>
> >>>>>>>>>> anyone
> >>>>>>>>>>
> >>>>>>>>>> knows of a nice tutorial or demo file of this in houdini?
> >>>>>>>>> The static droplets is not the problem,
> >>>>>>>>>
> >>>>>>>>>> I'm looking for some ideas on how to create the run-offs, how
> they
> >>>>>>>>>>
> >>>>>>>>>> pick
> >>>>>>>>>
> >>>>>>>> other droplets up on the way, and leave a trail behind.
> >>>>>>>>
> >>>>>>>> Thanks guys
> >>>>>>>>>
> >>>>>>>>>> G
> >>>>>>>>>> _______________________________________________
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