[Sidefx-houdini-list] pop previous velocity

Luca Zappala luca at cinesite.co.uk
Tue Apr 17 05:52:54 EDT 2007


In order to get the previous frame's pAge I could easily calculate 1/24 
and subtract it to the current pAge..... geez I haven't had my coffee 
yet......... :)
Luca

Luca Zappala wrote:
> Ok, I found a decent solution by storing the v to n, use the trail (1 
> frame) and compute velocity, copy v to oldVel, copy n back to v. This 
> way I get correct oldVel except for the last frame before the particle 
> dies, but I can live with that.
>
> Now I'm getting stuck with the particle Age (life[0]): I would also 
> like to store the previous frame's particle Age.  :)
> Any ideas?
> I guess this would be an interested topic on how to store simulation 
> variables at a different time from current time.
> thanks
> Luca
>
> Luca Zappala wrote:
>> Hello there,
>>
>> I'm trying to cache the particle oldVel (velocity at the previous 
>> frame).
>> I read the upvector node should create a previousVelocity local 
>> variable (PV) but this doesn't seem to be working properly, in fact 
>> PV is the same as V.
>> Do you have any other idea on how to store the oldVel as well?
>>
>> thanks a lot
>> Luca
>>
>>
>>
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