reuse point in pop network

[imoh3n]

hi.

in pop network i use a volume of points for source of emitter, i want to each point just emit a particle once. something like, don't reuse point in particle node.

i do something like that in sop network, create a group for points that id's, greater than the number of source points and use blast to delete particles in group, but i think there must be a better way.

i hope if somebody help me.

[SpencerL]

hi.

in pop network i use a volume of points for source of emitter, i want to each point just emit a particle once. something like, don't reuse point in particle node.

i do something like that in sop network, create a group for points that id's, greater than the number of source points and use blast to delete particles in group, but i think there must be a better way.

i hope if somebody help me.

On the popnet there is a parameter for Max Points that you set.

[Ratman]

On the popnet there is a parameter for Max Points that you set.

I'm amazed you could decipher that O.o

[imoh3n]

oh, i newer saw that, thanks a lot SpencerL.

[imoh3n]

no, it doesn't work SpencerL.

if particles die, new particles generated.

what should i do?

[cellchuk]

I'm not sure if I understand the question very well.

but if you are trying to emit on a specific frame what u are looking for is

lets say u only wonna emit as many points as your source, on frame 36;

Impulse Activation: $FF == 36

Impulse Birth Rate: $NPT

?

cheers,

selcuk

[imoh3n]

no, i upload a file.

i want to each point emit a one particle and never emit again, like don't reuse points option in particle node.

but in pop network i can't do that.

Edited December 10, 2009 by imoh3n

[imoh3n]

sample

reusePoints.hipnc

[Div]

Cellchuck give you the way to do that, just be sure that you've got your constant activation set to 0...

[imoh3n]

no Div, if you download sample, maybe you better understand my question.

in Cellchuck way, all points emit a particle on frame, but i don't want that.

[SpencerL]

Here is an example. You basically need to delete all but the point you want to emit from on the frame you want to emit. In the delete SOP I am doing this by the expression:

$PT == ($F - 1) / 10

If the point number equals the frame number, then its kept and it emits a particle. All others are deleted. I divide by 10 just to slow down when each particle is emitted.

emitOneAtATime_001sl.hip

[imoh3n]

in some situation it's maybe good, but i think, control of speed and number of emit is hard, especially if we have so many point for source of emitter.

[cellchuk]

you put a kill pop and use the following rule maybe

$ID >= npoints(opinputpath("../",0))

afterwards you can get rid of the unnecessary points in sops by using a similar expression in delete sop, such as;

$ID >= npoints("/obj/geo1/particlesource")

Edited December 11, 2009 by cellchuk

[Owl]

in some situation it's maybe good, but i think, control of speed and number of emit is hard, especially if we have so many point for source of emitter.

if i get it right you should divide a numper of source points by the amount of frames you need to emit

like that:

noReusePoints.hip

[imoh3n]

thanks cellchuk, the expression in sop, give better result, kill in pop doesn't work properly.

[imoh3n]

thanks Owl, interesting trick.