When a particle is generated,

how do I know at which frame it was generated? How can I save the frame number as a particlae attribute？



I read online that it says to use @age==0 to determine this,

But I found that once the particle is generated, @age is greater than 0, there is no such thing as @age equal to 0.

So I can't tell if the particle is generated in this frame or not.



As an example：

I want the particles generated after 20 frames to turn red, not @age at a certain value,

how can I achieve it?

You multiply age by the FPS rate and that's your age in frames. Something like this:

In your pop source you can create a "Just Born" group. Do that, and create a pop wrangle node affecting only this group, with:

protozoan

floor(@age * (1 / @TimeInc));

Thanks for your response,

you've provided a new method of calculation!

Tanto
In your pop source you can create a "Just Born" group. Do that, and create a pop wrangle node affecting only this group, with:

i@emitFrame = @Frame;

yes~

That's exactly the answer I was looking for!

Thank you very much!