[Sidefx-houdini-list] Trail pop particles

Olivier Jeannel facialdeluxe at gmail.com
Wed Aug 3 12:30:41 EDT 2016


Fresh restart of Houdini and it all works :/

Thank you François ;)


On Wed, Aug 3, 2016 at 6:16 PM, François Duchesneau <sidefx at trinix.ca>
wrote:

> If I try with just attribute id in the Add Sop it works. Make sure the
> Trail Lenght on the Trail Sop is long enough.
>
>
> On 08/03/2016 12:05 PM, Olivier Jeannel wrote:
>
>> Trying to build a "clean" trail, I'm doing an
>> Attribute Create name "x" value @id
>> TrailSop in "preserve original" mode
>> AddSop "by attribute" attribute name "x"
>>
>> But still, as soon a particle is delete, the remaining trailed particles
>> are doing a "mess" connecting .
>>
>> On Wed, Aug 3, 2016 at 5:47 PM, Olivier Jeannel <facialdeluxe at gmail.com>
>> wrote:
>>
>> you're right the particles that are killed have their id disapeared (from
>>> the Geometry Spreadsheet), and are not replaced with a particle with the
>>> same id number.
>>> My bad ;)
>>>
>>>
>>>
>>> On Wed, Aug 3, 2016 at 5:42 PM, François Duchesneau <sidefx at trinix.ca>
>>> wrote:
>>>
>>> Hi Olivier,
>>>>
>>>> Are you sure the id is changing? It's not supposed to. The point number
>>>> will change on the other hand but that's normal.
>>>>
>>>> Francois
>>>>
>>>>
>>>> On 08/03/2016 11:39 AM, Olivier Jeannel wrote:
>>>>
>>>> Hi guys,
>>>>> I'm emitting a massive amount of particles with a Dopnet / Pop vop.
>>>>> The particles are birthing, have a life of 3seconds (with some
>>>>> variance)
>>>>> and then are killed by the pop.
>>>>>
>>>>> All went well until I wanted to trail them.
>>>>>
>>>>> As the particles are diying, their id is changing creating a "decay" in
>>>>> the
>>>>> trail and everything looks like a mess.
>>>>>
>>>>> A part from having forever living particles that would be deleted after
>>>>> the
>>>>> simulation Dopnet and after the Trailsop (which would be a bit heavy)
>>>>>
>>>>> I can't think of a method that would stick an attribute to a particle
>>>>> at
>>>>> birth and wouldn't change.
>>>>>
>>>>> Any idea to properly trail ?
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>>>>>
>>>>>
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>
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