The type of region used for the emission area.

The world space size of the emission grid.

The world space center of the emission grid.

Restrict emission to the specified camera’s frustum.

The distance from the camera to start emitting foam.

The distance from the camera to stop emitting foam.

The min/max portions of the camera’s view for emission. This allows you to add padding to ensure good boundary conditions or focus into a key area of the scene.

Areas that are farther from the camera along the z-axis will emit fewer particles with a larger radius for less expensive simulation and rendering at a distance. When set to 0, the distance from camera will have no effect on particle density.

Emit foam where the ocean waves are above this cusp level.

Emit foam where the ocean waves are moving faster than this speed.

Emit foam where the ocean waves are above this height.

The time at which to evaluate the ocean surface.

Downsample the incoming ocean spectra before evaluating any ocean values. This parameter specifies the number of powers of two to remove from the resolution of the incoming ocean spectrum. For example, if the spectrum was originally specified at resolution 10 to generate a 1024 x 1024 volume, downsampling by 2 will evaluate ocean volumes at resolution 8, a 256 x 256 volume.

By default the particles are output in 2-d “rest” space, as expected by the Ocean Surface shader. Enabling this option will output the particles displaced by the ocean waves, usually for custom simulation or later processing.

How long the foam particles will live (in seconds).

Foam particles will live the number of seconds in Life Expectancy, plus or minus this number of seconds. Use 0 for no variance.

The amount of horizontal ocean velocity to impart to the foam particles. Increasing this value will increase the amount of squashing and stretching of the foam on the surface.

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

When the number of particles 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 number of particles 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 ever 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 list of attributes to keep from the foam simulation. The defaults of pscale, rest, age, and life are required for proper rendering with the Ocean Surface shader. Set this parameter to * to keep all attributes.