how to only birth particle from a point if no other particles birthed

[locvio]

In pops there's the origin attribute that indicates what point on SOP level a particle is sourced from.

I need to guarantee that a particle is born from a sop point (like point on a curve) only if

no other particles exist that were born from that point..

So trying to come up with a way to to

1) check if other particles exist that were born from origin point x.

2) if none exist, birth a new one (birth probability?)

Easy to do if I could have a global python dictionary with particle origins, but can't seem to do that in POPs:

python pseudocode:

lookup = {}

upon birth:

if origin not in lookup:

(birth particle)

lookup[origin] = "dummy"

alternatively if I can group particles by origin attribute and kill all the particles except those with smallest

particle id, that might work.

thanks for your help!!

Alex

Edited April 26, 2011 by locvio

[sanostol]

In pops there's the origin attribute that indicates what point on SOP level a particle is sourced from.

I need to guarantee that a particle is born from a sop point (like point on a curve) only if

no other particles exist that were born from that point..

So trying to come up with a way to to

1) check if other particles exist that were born from origin point x.

2) if none exist, birth a new one (birth probability?)

Easy to do if I could have a global python dictionary with particle origins, but can't seem to do that in POPs:

python pseudocode:

lookup = {}

upon birth:

if origin not in lookup:

(birth particle)

lookup[origin] = "dummy"

alternatively if I can group particles by origin attribute and kill all the particles except those with smallest

particle id, that might work.

thanks for your help!!

Alex

why don't You emit by ordered points, and set let the emission just stop when all You have $NPT particles?

[locvio]

why don't You emit by ordered points, and set let the emission just stop when all You have $NPT particles?

thanks,

I need to be able to re-emit one particle from any of the points based on other criteria as the sim progresses...

[sanostol]

ok, I see. What criteria for example, right now I have just a very diffuse picture of what You want to achieve

[locvio]

thanks!

instancing library pre-simmed bgeo splash sequences onto the location of points on a curve... I have an attribute called

effectTrigger that goes to 1 whenever I want to fire off the splash.. would like to use the particle to

store the location and the frame of where the effect needs to be fired. The particle will live for

as long as the library bgeo sequence will live, and then will die... at that point whenever effectTriger is turned on

(based on things like wave height) a new effect will be fired..

(at least that's the idea )

Alex