public void setOffsetAmount(float offsetAmount) {
        this.offsetAmount = offsetAmount;
    }
Sets the offset of this terrain texture map. Note that this does <b>NOT
</b> rebuild the terrain at all. This is mostly used for outside
constructors of terrain patches.

@param offsetAmount
           The new texture offset.
jme3-terrain/src/main/java/com/jme3/terrain/geomipmap/TerrainPatch.java