Changing foam lifespan

[vaya_studio]

Hey guys,
is there a way to limit the lifespan of the foam particles post sim ?
Is this what the Particle Age option is, and if so, how do we use it exactly ?
I'm trying to get rid of some of some ugly foam that's still lingering from the beginning of the sim.
Any help is appreciated

Thanks

[georgi.zhekov]

Hey,

You can find out more about the lifespan of the foam here - https://docs.chaosgroup.com/display/...dFoam-Lifespan

These options will control how long the foam will live, just make sure that you have the Particle age channel exported.

If you don't wish to resimulate again you can use the Cutter geometry option of the Particle shader. You can use a simple box and make it non-renderable and the use that as a cutter. This will render the particles only inside of the box or invert the cutter and render the rest.

[Svetlin.Nikolov]

Indeed it would be cool to allow the Particle Shader to render only a subgroup of particles based on Age. Currently you can select for rendering only particles above/below the liquid surface, and above/below a certain Size, but Age is not there yet.

Hope we will be able to add it soon

[vaya_studio]

Hey guys, thanks for the input to both of you.
georgi.zhekov is it possible to change the Half Life and Outside Life options after the simulation is ready if we have the Particle Age exported ? Or we need to resimulate ?
Since I want to foam to gradually disappear based on it's age the Cutter geometry is not really an option.
Svetlin.Nikolov it would be cool if we can somehow animate the size or the opacity of the particles

[Svetlin.Nikolov]

Oh, indeed you can - this would actually work in this case. You have the PA checkbox next to the Size Multiplier in the Particle Shader.

When it's unchecked, if you animate the size multiplier, it would apply to all particles simultaneously - e.g. if you animate it from 1 at frame 1 down to 0 at frame 10, then all particles will shrink and disappear by the 10th frame.

When PA is checked, the size multiplier animation will not apply to all particles in the same way. Instead, the timeline would act as the Age of each individual particles. If you animate the size multiplier again in the same way - 1 at frame 1 and 0 at frame 10, then each particle will start with its normal size, and shrink to zero 10 frames after it was born. This way when you have particles that are continuously born throughout the timeline, you can animate their size depending on their age.

So this would work for your case

[vaya_studio]

Svetlin.Nikolov Hey mate, thanks a lot for clarifying that, this is exactly what I needed