Flip narrow band doesn't work with reseeding/ reseeding messes up retime

[justinngjw]

Hey there,

I'm trying to do some slow-motion with my flip sim and realize that reseed particles are messing up the retime due to its nature to generate new particles every few frames. However I cannot disable reseeding because i'm siming my flip with Narrow Band. is there a way to tackle this without disabling Narrow Band or is there a way to somehow set a fix number of particles and set-id so the sim won't get  mess up when im trying to retime it? 

[tamagochy]

Enable add id in flip solver on particles motion tab. And use id attribute with retime

[justinngjw]

17 hours ago, tamagochy said:

Enable add id in flip solver on particles motion tab. And use id attribute with retime

Hey! yes I’ve did that, but the problem is because reseeding are enable, it causes the point and id to shift regularly.

 

this problem can be fix by turning off reseeding, but narrow band doesn't allow me to disable reseeding.

Edited June 16, 2022 by justinngjw
a more detail reply

[Benyee]

9 hours ago, justinngjw said:

yes I’ve did that, but it due to reseeding the points and it’s id still changes 

or post your file of simple version?

[justinngjw]

5 hours ago, Benyee said:

or post your file of simple version?

sure, heres the file with a flipbook.

notice how the reseeding takes effect in frame 33 

thank you

Retime_With_Narrowband.mp4

NarrowBand_Reseed.hipnc

Edited June 16, 2022 by justinngjw

[Benyee]

you almost got the way, just try setting "birth threshold" to 0 on flip solver

NarrowBand_Reseed_fix_od.hipnc

sometimes this kind of issues are knotty, generally we can adjust reseeding paramaters,
some lower birth thresholds, higher death thresholds, and lower surface oversamplings, or other parameters, depends on your effect needs
and also, increasing flip resolution is important for decreasing the popping effects

[justinngjw]

2 hours ago, Benyee said:

you almost got the way, just try setting "birth threshold" to 0 on flip solver

NarrowBand_Reseed_fix_od.hipnc

sometimes this kind of issues are knotty, generally we can adjust reseeding paramaters,
some lower birth thresholds, higher death thresholds, and lower surface oversamplings, or other parameters, depends on your effect needs
and also, increasing flip resolution is important for decreasing the popping effects

hey, thanks for the suggestion! however it doesn't seems to work. if you look at the geometry spreadsheet, the id and ptnum are still shifting along with the frame moving forward. 

 

From the file you give, after retime, the particles are still shifting. you can see the first shifting in frame 33

 

I need the particle id to stay the same throughout the sim.

 

I've tried to revisit the parameters as you suggest, but I still can't find anything affecting the reseed.