[Sidefx-houdini-list] Air Bubbles in Liquid

Andy Nicholas andy at andynicholas.com
Tue Nov 4 17:53:44 EST 2008


Haven't had time to read through the thread so far in huge detail, so I
don't know how relevant this is to what you're doing.

In the project I'm working on at the moment, I need to have bubbles being
propagated along with a liquid that's being poured. I'm just using a POP
solver in a DOP network and I'm using a Field Force with it set to "wind
force" to get the correct interaction between the the particles and the
fluid. It generally seems to work pretty well, not perfect but it's a
fairly quick and cheap way of doing it.

Cheers

Andy



> Well, I haven't played too much with houdini fluids myself, but certainly
> with other fluid solvers. So my help is more on the theoretical side. But
> I
> think that if you plan to make a cheat layer with those bubbles, you just
> need the dropped object motion to generate those bubbles. The counterpart
> is
> that those bubbles won't be afecting the object's motion, but depending on
> the accuracy you're looking for it won't matter.
> For me the prominant air is part of the same bubble sim, like you have to
> make th object to emit the fluid particles that will simulate the
> prominent
> air and the bubbles.
>
> Water surface interaction. That might be the most problematic area. You
> can
> try to do the sim in passes, having the interaction with the initial
> surface
> (object+water surface sim), and then create a second water surface
> displaced
> based on the position of those points.
>
> I don't know if I'm following you or not.
> Hope it helps
> Cheers
>
> Beatriz
>
> 2008/11/4 Jaideep Khadilkar <iamjaideep80 at yahoo.com>
>
>> Hi Beatriz
>>
>> This is exactly what I want, but can I do it in houdini. And Instead of
>> bubble to be filled, can they be empty and part of the same simulation
>> where
>> my object drops into the water.(It doesn't mean  that I want them to
>> generate automatically as object hits the water. I can add them as a
>> separate cheat layer, but they have to be part of the same sim, so that
>> they
>> can interact with the original object,water and the prominant air that
>> enters the water as the object enters the water)
>>
>> -----iamjaideep80
>> (Jaideep Khadilkar)
>>
>> --- On *Wed, 5/11/08, Beatriz Lorenzo <bealobo at gmail.com>* wrote:
>>
>> From: Beatriz Lorenzo <bealobo at gmail.com>
>> Subject: Re: [Sidefx-houdini-list] Air Bubbles in Liquid
>> To: sidefx-houdini-list at sidefx.com, iamjaideep80 at yahoo.com
>> Date: Wednesday, 5 November, 2008, 1:09 AM
>>
>>
>> I think you can use the fluid sim to make the bubbles alone, without any
>> liquid surrounding. So that you avoid the two fluids interaction.
>> Like this
>> http://www.youtube.com/watch?v=1lRw7_DfWEM
>> or if you go to lab/improved object emission at www.oddmood.com
>>
>> I hope it makes sense
>>
>> 2008/11/4 Jaideep Khadilkar <iamjaideep80 at yahoo.com>
>>
>>>
>>> Hi...
>>>
>>>
>>> Here is the reference of what I want.
>>> http://in.youtube.com/watch?v=IfTKKfdFOow
>>>
>>> Simple particles won't give the feel. I have seen one shot in h9 sneak
>>> peek, where
>>> bubbles are generated inside liquid, and they travel upwards.
>>> here is the link....
>>>
>>> http://www.sidefx.com/index.php?option=com_content&task=view&id=545&Itemid=66
>>>
>>> I
>>> did a simulation of object dropped in a liquid, Liquid reacts properly
>>> but the bubbles are not created. I thought, i would add them, inside
>>> the liquid in the same simulation.
>>> I tried adding another fluid  inside a sphere which is below the water
>>> level (as a bubble), and pumping it up, but it doesn't interact
>>> properly
>>> with the water.
>>>
>>>
>>> -----iamjaideep80
>>> (Jaideep Khadilkar)
>>>
>>>
>>> --- On Wed, 5/11/08, Erika Salatiello <tictacer at hotmail.com> wrote:
>>> From: Erika Salatiello <tictacer at hotmail.com>
>>> Subject: Re: [Sidefx-houdini-list] Air Bubbles in Liquid
>>> To: "user group" <sidefx-houdini-list at sidefx.com>
>>> Date: Wednesday, 5 November, 2008, 12:49 AM
>>>
>>> Yes! that's it - my apologies, I forgot it was in the downloadable
>>> shelf.
>>>
>>> Thanks for the correction Steve.
>>>
>>> > Date: Tue, 4 Nov 2008 13:42:54 -0500
>>> > From: stucker at sidefx.com
>>> > To: sidefx-houdini-list at sidefx.com
>>> > Subject: Re: [Sidefx-houdini-list] Air Bubbles in Liquid
>>> >
>>> > Maybe you have a custom shelf tool Erika?  I don't see a dop shelf
>>> tool
>>> > for underwater bubbles, but there is a tool on the downloadable FX
>>> shelf
>>> > for doing particle based bubbles.
>>> >
>>> > -Steve
>>> >
>>> > Erika Salatiello wrote:
>>> > > There is a shelf tool for underwater bubbles on the DOPS shelf - I
>>> don't know that it behaves exactly as you need, but if I recall it just
>>> sends tiny bubbles upwards in a stream from under water. Perhaps if you
>>> start
>>> from there then dive into the network, you can get a basis for how to
>>> create
>>> your own version?  Just an idea....
>>> > >
>>> > >
>>> > >> Date: Tue, 4 Nov 2008 00:05:30 +0000
>>> > >> From: pablogipi at gmail.com
>>> > >> To: sidefx-houdini-list at sidefx.com; iamjaideep80 at yahoo.com
>>> > >> Subject: Re: [Sidefx-houdini-list] Air Bubbles in Liquid
>>> > >>
>>> > >> You really need to make a fluid simulation?
>>> > >> How is the shot?
>>> > >> Maybe you can so it with simple particles....
>>> > >>
>>> > >> 2008/11/3 Jaideep Khadilkar <iamjaideep80 at yahoo.com>
>>> > >>
>>> > >>
>>> > >>> Hi......
>>> > >>>
>>> > >>> I want to emit some air bubbles from an object inside a
>>> liquid.
>>> > >>> In houdini 9 sneak peek I have seen the same effect. So I
>>> know that it is
>>> > >>> possible in houdini.
>>> > >>> I think they have used SDF fluid for it.
>>> > >>> I tried using sink object with SDF fluid. It created a bubble
>>> inside the
>>> > >>> fluid.
>>> > >>> But the bubble doesn't travel up, as it should. Does
>>> anybody know how to do
>>> > >>> it???
>>> > >>> I tried using pump object, but the whole fluid gets affected
>>> and moves up.
>>> > >>>
>>> > >>>
>>> > >>> ---iamjaideep80
>>> > >>> (Jaideep Khadilkar)
>>> > >>>
>>> > >>>
>>> > >>>
>>> > >>>
>>> > >>>      Add more friends to your messenger and enjoy! Go to
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>>> > >>>
>>> > >>
>>> > >> --
>>> > >> Un saludo
>>> > >> Best Regards
>>> > >> Pablo Giménez
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>>> > Stephen Tucker
>>> > Product Specialist
>>> > Side Effects Software Inc.
>>> > (416) 504 9876 x:331
>>> > stucker at sidefx.com
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