Foam

Starting point for foam is always an existing → core fluid simulation, but foam can also be created from splashes or bubbles.

Scene Setup

• Set the domain's simulation state to → “Cache” (“yellow rocket”).

• Add a "Foam" emitter from the “Hybrido” shelf.
• Unlink the emitter from the → “Hub” in the → “Relationship Editor”.
• Connect it with the Hybrido domain.
• If there is a → “k Volume” daemon already connect it with the emitter.
• Reset the scene.

If you want to use the foam emitter's “From splash” option, a splash simulation is required – the associated splash node has to be set to “Cache” as well.

What you see now is a cross in the viewport's centre, indicating that the emitter is not bounded. You can prevent the particles from leaving the domain:

• Add a → “k Volume” daemon – if necessary – and adjust it to the scene with the R key.
• If not done already connect the daemon with the emitter in the → “Relationship Editor” (see above).
• Or make sure that the foam particles will be enclosed inside a container or a cube.

You can control the emission of particles with the parameters under → “Foam Creation”:

• A wide variety of threshold values are used to control in which parts of the core fluid splashes will occur. These areas can be → previewed.
• The higher the thresholds, the less particles you will get ("Angle threshold" is the only exception).
• If you want to create foam from the core fluid only disable “From Splash”.
• The “Emission rate” parameter is also responsible for the number of particles. With foam, this parameter is very sensitive.

Simulate.