[Matteo Masin]

Ok. I did something quite right with Particle Playground. Basically it uses a black layer which becomes white (with brightness animated) as a “selection map” to generate new particles from the existing ones; so when the layer is white it divides the particles in new ones.

Now I would need an expression to say that every time the brightness value of the solid is 100 the scale of the new particles would be the half of the previous value. That’s because Particle Playground divide existing particles according to a scale value (If the existing particle has a value of 100 and the new particles radius is set to 50 it divides the main particle in 4).
In practice I would need to divide in two the value of the scale every time the brightness of the selection map layer turns to 100. Can some Expression guru help me?
Please!

I don’t think in Particular you have the possibility to generate Aux particles from the new ones but only from the main emitter…

[Matteo Masin]

Thanks Roland!
we tried your script and it works! It seems to be very useful also for a lot of other issues like reducing the amount of parented effects! Really thanks!

[Matteo Masin]

GREAT! IT WORKS!
This is the reason I love Creative COW!
You’re a genius! really thank you.

[Matteo Masin]

Thanks Walter,
but this seems not to work like I expected. For some reason if I select all the layers, press S and, suppose, scrub a 100% scaled layer to 25%, the other layers don’t scale down to their relative 25% (for example a layer starting with a 80% scale doesn’t go to 20%). I just tried, but it seems that other layers just go down in scale by the same “absolute” scale value (in this case the 75% down).

Please let me know if I’m missing some step…

Thanks.