public void setWindDirection(Vector2f windDirection) {
        this.windDirection = windDirection;
        if (material != null) {
            material.setVector2("WindDirection", windDirection);
        }
    }
sets the wind direction
the direction where the waves move
default is (0.0f, -1.0f)

@param windDirection the direction vector to use (alias created,
default=(0,-1))
jme3-effects/src/main/java/com/jme3/water/WaterFilter.java