@Override
    public void setHeightAtPoint(float height, int x, int z) {
        heightData[x + (z * size)] = height;
    }
<code>setHeightAtPoint</code> sets the height value for a given
coordinate. It is recommended that the height value be within the 0 - 255
range.

@param height
           the new height for the coordinate.
@param x
           the x (east/west) coordinate.
@param z
           the z (north/south) coordinate.
jme3-terrain/src/main/java/com/jme3/terrain/heightmap/AbstractHeightMap.java