public void setRefractionClippingOffset(float refractionClippingOffset) {
        this.refractionClippingOffset = refractionClippingOffset;
        updateClipPlanes();
    }
Sets the refraction clipping plane offset
set a positive value to raise the clipping plane for refraction texture rendering

@param refractionClippingOffset the desired offset (default=0.3)
jme3-effects/src/main/java/com/jme3/water/SimpleWaterProcessor.java