How can I select the particles reside on the fluid surface?

[Masoud]

Hello guys,

I want to apply some effects to the "low-density" particles that reach the surface (like bubbles), so how can I select them?

Is there any microsolver that helps?

I think measuring the SDF can't help because the side walls of the container are close to the particles, too.

 

Thanks for helping.

Edited April 12 by Masoud

[Librarian]

@Masoud destination of your  effect missing  exactly  referrer v ....

[Masoud]

Hi Tesan,
I didn't get what you mean 

[paranoidx]

the fluid has "surface" SDF field, sample from that field to select what you want excluding the bound container 

[Masoud]

Hi Paranoidx,
That's the problem: how can I exclude the "bound container"?

[Librarian]

@Masoud You want something Like Mask to control That filed or?

 

[Masoud]

For say, I need to apply some effects, only to the water's surface, in a cup.

So I don't need that effect, where the fluid contacts the container, thus I need an attribute that shows particles on the top of the fluid surface.

[Librarian]

@Masoud Yes  I get it , air field system   and Use in Sop solver inside Your Dop to define yours groups water and Density Mass . You have Files here on Forum or Sidefx forum or Peoples post some strange HDA on web, you can Find if I can . I would make so.. it works in Cup too. Here its just some dir and amp on vel-...If you mean Like This ..a lot to tweeek.. IDK