public void setPlane(Vector3f origin, Vector3f normal) {
        this.plane.setOriginNormal(origin, normal);
        updateClipPlanes();
    }
Set the water plane using an origin (location) and a normal (reflection direction).
@param origin Set to 0,-6,0 if your water quad is at that location for correct reflection
@param normal Set to 0,1,0 (Vector3f.UNIT_Y) for normal planar water
jme3-effects/src/main/java/com/jme3/water/SimpleWaterProcessor.java