[Sidefx-houdini-list] particles and point sop

Rangi Sutton rangi at kanuka.com.au
Tue Apr 3 02:06:38 EDT 2007


Johnson, Dave (Space Technology) wrote:
> Sorry for the late post, but is there any reason you don't want to set the mass/drag of the particles in the POP network?
This thread was regarding using the Particle Sop (either for Escape or
Touch, I can't remember which) so solution required no POPs. I think
it's been resolved now.

Beers,
r.

>  If you want to use $ID to affect the mass in order to affect the simulation, I think you need to assign it in the POP network. If you're assigning attributes that you'll use after the fact (for stamping or rendering, etc) then you can use a point SOP afterwards and then you'll have id available to you.
>
> Dave
>
>
> -----Original Message-----
> From: sidefx-houdini-list-bounces at sidefx.com on behalf of Gene Dreitser
> Sent: Mon 3/19/2007 10:45 AM
> To: sidefx-houdini-list at sidefx.com
> Subject: Re: [Sidefx-houdini-list] particles and point sop
>  
> Heya all,
>
> off the top of my head, I would imagine that using $PT in a situation where the point count is likely to change (such as a particle system, with birthing, and dying particles) would be kinda chaotic.
>
> For the record though, I don't have any better ideas *grin*
>
> Cheers,
>
> G
>
> ----- Original Message ----
> From: "Johnson, Dave (Space Technology)" <dave.johnson at ngc.com>
> To: sidefx-houdini-list at sidefx.com
> Sent: Monday, March 19, 2007 1:39:49 PM
> Subject: RE: [Sidefx-houdini-list] particles and point sop
>
> It sounds like you're trying to set the mass after the particle SOP, which won't affect the sim, or beforehand when $ID doesn't exist yet.
>
> Try rand($PT) to see if that helps.
>
> Dave
>
>
> -----Original Message-----
> From: sidefx-houdini-list-bounces at sidefx.com on behalf of jason lam
> Sent: Sat 3/17/2007 9:36 AM
> To: sidefx-houdini-list at sidefx.com
> Subject: [Sidefx-houdini-list] particles and point sop
>  
> howdy,
> been playing with the particle sop and point sop and i'd really like
> to be able to have randomness in mass and drag on my particles so i
> put in a point sop and in mass/drag put in
> rand($ID)* 50 which did a great deal of not much.
> How do i achieve this effect?
>
> Thanks muchly
>
> Jason





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