[Sidefx-houdini-list] [n00n] issue particle selfcollission

Georg Duemlein, Dipl.-Des. info at preset.de
Wed Feb 28 11:36:14 EST 2007


thanks for the explanation.

As for the interact POP:
I copy boxes on the particles.
If the particles pervade, is this caused by to much velocity and they 
cannot break?


Abdul-Kareem Abo-Namous wrote:
> For some details on the clip you cited (from the Gatorade spot), see
> http://forums.odforce.net/index.php?showtopic=2720&hl=gatorade
> "Particle interaction" is the interact POP. "RBD <-> particle interaction"
> can go both ways (particles influencing RBDs and vice versa), there are 
> some
> nice examples in the help tab for the POP Solver, such as
> $HFS/demo/helpcards/dop/sopsolver/DOP_EXAMPLE_sopsolver_DentingWithPops.cmd
> As for "particle selfcollision", I'm not aware of any direct way to do 
> that,
> seeing that particles don't have a surface or volume, so apart from their
> charge and scale (which are both taken into consideration in the interact
> POP), no properties exist that enable a collision check.
> Of course, you could instanciate geometry using the copy DOP onto 
> particles,
> run it through an RBD solver, and retrieve the original point positions 
> back
> afterwards.
> br,
> Abdelkareem
> On 2/28/07, Georg Duemlein, Dipl.-Des. <info at preset.de> wrote:
>> Dear List,
>> I need some clarification on this topics:
>>   * particle selfcollision
>>   * particle intraction
>>   * rigidbody particles interaction
>> A friend of mine cites Houdini as the application that offers particle
>> self collision and this movie:
>> http://deko.lt/tmp/Forums/fracture_DD_houdini.mov
>> I already found the interactSOP, which offers great possibilities.
>> But to understand things right, this *just* is an simulation of charge
>> based on a radial forcefield around the particle?
>> Fractured objects can't interact through particles and need to be a
>> rigid body thing? I have seen the Pre/Post-ROP-Script fields, and I
>> guess, here POP and DOPs cann communicate?
>> Please drop me a few sop/dop/pop names to look up in the help or point
>> me to a paper.
>> I guess my main problem is the lack of
>> houdini-speak-how-to-call-things-right.
>> Thank you,
>> Georg
>> -- 
>> Dipl.-Des. Georg Dümlein
>>   http://www.preset.de/
>>   http://www.count-as-one.org/
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Dipl.-Des. Georg Dümlein


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