mathe/Library/PackageCache/com.unity.shadergraph@14.0.8/Documentation~/Evaluate-Simulation-Additional-Data-Water-Node.md

Evaluate Simulation Additional Data

This node provides access to Water's surface foam, surface gradient, and deep foam. You can also use this node to dampen the normals for each water band.

The High Definition Render Pipeline (HDRP) uses this node in the default water shader graph to fetch data from the water simulation. Don't modify the settings of this node. See the HDRP documentation for more information about the Water System.

Render pipeline compatibility

Node	Universal Render Pipeline (URP)	High Definition Render Pipeline (HDRP)
Evaluate Simulation Additional Data	No	Yes

Ports

Name	Direction	Type	Description
BandsMultiplier	Input	Vector4	The amount to dampen displacement for each water band. Bands are different wave frequencies that create swells, agitations or ripples on the water.
SurfaceGradient	Output	Vector3	The perturbation of the normal, as a surface gradient.
LowFrequencySurfaceGradient	Output	Vector3	The perturbation of the low frequency normal, as a surface gradient. The low frequency normal is the normal of the water surface without high frequency details such as ripples.
SurfaceFoam	Output	Float	The amount of foam.
DeepFoam	Output	Float	The amount of foam under the water's surface.