public void setNormalScale(float normalScale) {
        this.normalScale = normalScale;
        if (material != null) {
            material.setFloat("NormalScale", normalScale);
        }
    }
Sets the normal scaling factors to apply to the normal map.
the higher the value the more small ripples will be visible on the waves.
default is 3

@param normalScale the scaling factor (default=3)
jme3-effects/src/main/java/com/jme3/water/WaterFilter.java