Triangle fans

[nt3d] / box_by_trianglefan.html
diff --git a/box_by_trianglefan.html b/box_by_trianglefan.html

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+<html>
+  <head>
+    <title>Box by trianglefan</title>
+    <script type="text/javascript" src="nt3d.js"></script>
+    <script type="text/javascript">
+      function box_by_trianglefan(size_as_string) {
+        var size = parseFloat(size_as_string);
+        var origin = [0,    0,    0   ];
+        var x      = [size, 0,    0   ];
+        var y      = [0,    size, 0   ];
+        var z      = [0,    0,    size];
+        var xy     = [size, size, 0   ];
+        var xz     = [size, 0,    size];
+        var yz     = [0,    size, size];
+        var xyz    = [size, size, size];
+       return [].concat(
+         nt3d.trianglefan([origin, x, xz, z, yz, y, xy, x]),
+         nt3d.trianglefan([xyz, yz, z, xz, x, xy, y, yz]));
+      }
+      var params = [["Size", 1]];
+    </script>
+  </head>
+  <body onload="nt3d.framework(box_by_trianglefan, params)">
+    <h1>Box by trianglefan</h1>
+    <p>Make a box with two triangle fans from opposite corners.</p>
+  </body>
+</html>