[Sidefx-houdini-list] Trail pop particles

François Duchesneau sidefx at trinix.ca
Wed Aug 3 12:16:35 EDT 2016


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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