public void setFoamExistence(Vector3f foamExistence) {
        this.foamExistence = foamExistence;
        if (material != null) {
            material.setVector3("FoamExistence", foamExistence);
        }
    }
Describes at what depth foam starts to fade out and
at what it is completely invisible. The third value is at
what height foam for waves appear (+ waterHeight).
default is (0.45, 4.35, 1.0);

@param foamExistence the desired parameters (alias created)
jme3-effects/src/main/java/com/jme3/water/WaterFilter.java