ion="45"/>
        </feDiffuseLighting>
      </filter>
    </defs>
    <!-- ==================================================== -->
    <!-- The same image is rendered multiple times with using -->
    <!-- different filters.                                   -->
    <!-- ==================================================== -->
    <!-- Various Surface Scales -->
    <g transform="translate(0, 50)">
      <text x="90" y="25">Various values for surfaceScale: 1, 10 and -10</text>
      <image xlink:href="..