Add metaballs

index.html

@@ -18,6 +18,7 @@
         <li><a href="bezier-1.html">Bezier demo #1</a></li>
         <li><a href="bezier-2.html">Bezier demo #2</a></li>
         <li><a href="spline.html">Bezier spline demo</a></li>
+        <li><a href="metaballs.html">Metaballs</a></li>
         <li><a href="image.html">Image demo</a></li>
         <li><a href="move.html">Move demo</a></li>
         <li><a href="life.html">Game of life</a></li>