@Override
    public void setHeightScale(float scale) {
        heightScale = scale;
    }
<code>setHeightScale</code> sets the scale of the height values.
Typically, the height is a little too extreme and should be scaled to a
smaller value (i.e. 0.25), to produce cleaner slopes.

@param scale
           the scale to multiply height values by.
jme3-terrain/src/main/java/com/jme3/terrain/heightmap/AbstractHeightMap.java