[Sidefx-houdini-list] Fwd: Re: Flip collision in normal direction only?

François Duchesneau sidefx at trinix.ca
Mon Feb 24 09:23:57 EST 2014


Hi Dominik,

I don't think you can include images with the mailing list. You'll need 
to use the forum for that.

Just an idea because I haven't used Flip for a while but my bet for 
applying custom collision behavior is by using it in combination with a 
Sop Solver and deal with the exception inside it.

François

Dominik Kirouac wrote:
> Sorry for the double msg, I've deleted the image from the previous one 
> because It being held by moderator for size limit (52.7kb and maximum 
> is 45kb) :)
>
> Here is my question:
>
> "How can I chose in which FLIP object the source volume will emit is
> particles ?
> There is a Particle fluid object parameter under the source
> volume/particle operation, but even if I forced a FLIP object there ie
> Milk_OUTSIDE, Milk_INSIDE also contain the particle of the other source
> volume.
>
> I've attached an image to show what I want to achieve.(Maybe the image 
> will be sent later )
>
> Thanks"
>
> Le 24/02/2014 7:38 AM, Nick Nimble a écrit :
>> Hi Dominik,
>>
>> How about splitting it into two simulations? You can source the fluid
>> from your desired location outside the sphere, when particles collide
>> with the sphere you kill them. Then in SOP's you build a new source
>> from the particles that die on the current frame, but slightly
>> displaced by the normal of the sphere, so they are inside. Then in the
>> second simulation you can source from those points and have this fluid
>> collide with the inside of the sphere.
>> The cool thing about this, is that it can work in any situation with
>> any piece of enclosed geometry :-)
>>
>> Cheers,
>> Nick, be Nimble
>> -- 2014 the year where things become clearer --
>> +31 622 4243 94 | www.nicknimble.com | www.facebook.com/nicknimble
>>
>> On 24/02/14 13:30, Dominik wrote:
>>> Hey list,
>>>
>>> Is it possible to make flip collide but only from the normal
>>> direction. Let me explain. Ie: I want to pour liquid from the outside
>>> of a sphere, but when the liquid enter the sphere, I want it to start
>>> colliding with the sphere interior.
>>>
>>> I'm thinking about giving a group to particles inside the collision
>>> object and use this group in my static object. But I'm not sure it
>>> will work because the collision is apply to the flip object and not
>>> per particle. I will try some ideas today, but if you think to a
>>> solution, let me know.
>>>
>>> Thanks
>>>
>>> Doum
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>
>
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