The initial lifespan of foam particles can be mapped from a zero to one attribute on the foam particles. The lifespan will range from Min Lifespan to Max Lifespan, or just be set to Min Lifespan if this parameter is not set. Using the same attribute that originally controlled particle emission (typically the emit attribue) will give larger clumps of foam a longer initial lifespan.

The minimum lifespan for foam particles that map to the zero value of of the Lifespan Attribute, or for all particles if that attribute is not set.

The maximum lifespan for foam particles that map to the one value of the Lifespan Attribute.

A random number of seconds within this range is added or subtracted from the foam lifespan.

Increase or decrease the lifespan of foam particles based on the local density of foam particles, which can help create clumps and streaks of foam on the liquid surface over time.

When the local foam density surrounding a foam particle lies in the range of this value down to zero, proportionally reduce its lifespan each timestep by the Reduction Rate.

When the local foam density surrounding a foam particle lies in the range of Min Foam Density up to this value, proportionally increase its lifespan each timestep by the Preservation Rate.

The proportional amount to increase the lifespan of a foam particle with sufficiently high local foam density. This value is the number of seconds to add per second, so if greater than one can effectively preserve high density foam clumps from every being killed.

The proportional amount to decrease the lifespan of a foam particle with sufficiently low local foam density. This value is the number of seconds to reduce the lifespan per second.

The strength of the advection force that carries the foam with the velocity field from the source liquid simulation. Very high values will cause the foam to follow the liquid surface very closely and lead to fine, streaky foam. Lower values give more diffuse, spread-out foam.

The rate at which the foam advection force falls off away from the middle of the foam layer. Low values representing a slow falloff mean more foam particles have strong advection forces and produce tighter streaks of foam. With a higher falloff the foam gradually gets smeared across the surface over time.

Specifies the foam particle behavior when hitting the Volume Limits.

Adds additional advection velocity towards a unique depth within the foam layer for each particle, giving more control over the volume of the resulting foam and keeping the foam particles closer to the foam Iso Surface value over time.

A multiplier for the the foam Depth when choosing unique depth values for each foam particle. Setting this parameter below 1 acts similar to surface tension, where the foam will be attracted inwards toward the fluid surface over time.

A random variance added to the Depth Scale parameter. Higher values for this parameter increase the "fuzziness" of the foam around the edges. Lower values give harder edges to the foam.

The amount each foam particle will move towards its goal depth on each timestep. Higher values give a stronger volumetric force, but can cause snapping artifacts as bubble and spray particles transition to foam.

A random seed for controlling the goal depth and variance for each form particle.

A ramp that multiplies the Depth Scale over the lifetime of the foam particle. A decreasing ramp creates foam that starts out more volumetric then attracts inwards over time as the foam begins to dissipate.