[Sidefx-houdini-list] Flipping viscosity

[Nick Zutphen]

Hi Nick,

Well I'm not allowed to talk about any of that, I'm sorry.

If you intern with a R&D company like SideFX, you have to sign a NDA (non disclosure agreement). Which basically says: you can't talk publicly about anything you read, hear, see or smell (:p) within the walls of the office. Such an agreement last for an x period of time, I guess a year after your contract ends. It's due to protect the intellectual property of a company like SideFx, especially when it comes down to competitors. This makes sense to me.

Cheers,
Nick van Zutphen
----
http://www.nickvanzutphen.com

On Sep 21, 2011, at 2:21 PM, nicholas pliatsikas wrote:

> Nice one Nick van Zutphen !! ;¬) Did you come up with fix too?
> Cheers
> Nick
> 
> On Wed, Sep 21, 2011 at 12:58 PM, Nick Zutphen <nvanzutphen at live.com> wrote:
> 
>> Hi Nick!
>> 
>> I just had a look at the file that you shared and I figured it looked very
>> familiar to me. Turns out, I made this file during my internship with SideFX
>> in Toronto last summer :p. When I started writing this email I suddenly
>> remembered that at  some point I was in contact with a 'Nick'.
>> 
>> Cheers!
>> Nick van Zutphen
>> ----
>> http://www.nickvanzutphen.com
>> 
>> On Sep 21, 2011, at 1:41 PM, nicholas pliatsikas wrote:
>> 
>>> Hey andy
>>> Ok there where various fixes that we came across and sidefx also sent
>>> heres one for surface tension
>>> 
>> http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=20359
>>> 
>>> and the text from me to sidefx support regarding this
>>> 
>>> Anyways Id like to put an rfe/bug report in for the flip fluid solver.
>> After
>>> some tests it seems that surface tension, viscosity and friction dont
>> work
>>> at all on the flipfluid solver, im thinking that they havent been
>> implement
>>> rather then they dont work.
>>> 
>>> Theres a wee thread on sidefx.com regarding some of this.
>>> 
>>> http://www.sidefx
>>> .com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=20359
>>> 
>>> The surface tension can be added to the flip solver very easily using a
>> gas
>>> surface tension microsolver. So im guessing it should be pretty easy to
>>> integrate correctly into the flip setup.
>>> 
>>> For viscosity, we tried gasblur on velocity etc but this messes with
>> general
>>> velocity to an extent it slows down the fluid as whole, for example the
>>> fluid would look like its floating as gravity doesnt have the same pull
>> on
>>> it due to blurred velocity.
>>> Sidefx sent me a better solution, Ive uploaded the file sent to me with a
>>> better working viscosity, i cant quite recall what the changes where off
>> the
>>> top of my head.. but i do think there where some notes in the file.
>>> 
>>> http://www.mediafire.com/?t1u8ts2gnntb1vp
>>> 
>>> Either way sidefx informed me that these issues should be solved in the
>> next
>>> houdini version.
>>> 
>>> Hope that helps
>>> Cheers
>>> Nick
>>> 
>>> On Wed, Sep 21, 2011 at 11:25 AM, andy at andynicholas.com <
>>> andy at andynicholas.com> wrote:
>>> 
>>>> Hi Nick! Thanks a lot, much appreciated :)
>>>> 
>>>> Cheers,
>>>> Andy
>>>> 
>>>> 
>>>> On 21 September 2011 at 10:28 nicholas pliatsikas
>>>> <nicholas.pliatsikas at gmail.com> wrote:
>>>> 
>>>>> I had the exact same problem, i ended up contacting support about this
>> as
>>>> it
>>>>> really became a big limitation. Let me do a wee search through my email
>>>> and
>>>>> will pass you the relevant information.
>>>>> Cheers
>>>>> Nick
>>>>> 
>>>>> On Tue, Sep 20, 2011 at 10:50 PM, andy at andynicholas.com <
>>>>> andy at andynicholas.com> wrote:
>>>>> 
>>>>>> Hi all,
>>>>>> I have a feeling I know what the answer to this'll be, but I need to
>>>> ask
>>>>>> just in
>>>>>> case... does anyone know if there's any way of getting FLIP fluids to
>>>>>> exhibit
>>>>>> some sort of viscosity?
>>>>>> 
>>>>>> I've had a quick play with SPH and the speed (or lack of) means that
>>>> it's
>>>>>> not
>>>>>> really an option. FLIP is so much faster, but I'm just lacking the
>>>> control
>>>>>> over
>>>>>> the thickness that I need to achieve. Anyone tried any POP or SOP
>>>> solver
>>>>>> hacks
>>>>>> to get this effect?
>>>>>> 
>>>>>> Any pointers gratefully received.
>>>>>> 
>>>>>> Thanks :)
>>>>>> 
>>>>>> Andy
>>>>>> _______________________________________________
>>>>>> 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
>>> 
>> 
>> _______________________________________________
>> 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
>