public void setNbSamples(int nbSamples) {
        this.nbSamples = nbSamples;
    }
sets the number of samples for the radial blur default is 50
the higher the value the higher the quality, but the slower the performance.

@param nbSamples the desired number of samples (default=50)
jme3-effects/src/main/java/com/jme3/post/filters/LightScatteringFilter.java