public void setPeakWalk(int peakWalk) throws Exception {
        if (peakWalk <= 0) {
            throw new Exception(
                    "peakWalk must be greater than " + "zero");
        }
        this.peakWalk = peakWalk;
    }
<code>setPeakWalk</code> sets how often the jump point will be
agitated. The lower the peakWalk, the more often the point will
be agitated.

@param peakWalk the amount to agitate the jump point.
@throws Exception if peakWalk is negative or zero.
jme3-terrain/src/main/java/com/jme3/terrain/heightmap/ParticleDepositionHeightMap.java