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

Evaluate Foam Data

This node calculates water foam intensity.

This node outputs foam as monochrome in the red channel. If you connect the output of this node to a Base Color block, all the channels are red. To prevent this, split the output and use only the red channel. You can't apply a tint to foam.

The High Definition Render Pipeline (HDRP) uses this node in the default water shader graph. 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 Foam Data	No	Yes

Ports

Name	Direction	Type	Description
SurfaceGradient	Input	Vector3	The perturbation of the normal, as a surface gradient.
LowFrequencySurfaceGradient	Input	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.
SimulationFoam	Input	Float	The amount of foam. HDRP uses this property in the default water shader graph to fetch foam data from the simulation.
CustomFoam	Input	Float	The amount of foam, if you create your own foam.
SurfaceGradient	Output	Vector3	The calculated water surface normal, as a surface gradient.
Foam	Output	Float	The combination of the amount of foam and a foam texture.
Smoothness	Output	Float	The smoothness of the water surface. For more information about this property, see Settings and Properties Related to the Water System.