X-Git-Url: http://git.scottworley.com/nt3d/blobdiff_plain/bdd7bcc0908b9eb688223b1cc48dbc80b4ef3556..3fdffa6cef1752afc1143dac2d8b9966fc91cc2d:/medusa.html

diff --git a/medusa.html b/medusa.html
index da807f5..0576312 100644
--- a/medusa.html
+++ b/medusa.html
@@ -3,13 +3,16 @@
     <title>Medusa</title>
     <script type="text/javascript" src="nt3d.js"></script>
     <script type="text/javascript">
-      function finger(params, finger_crosssection, ring_radius, finger_angle) {
+      function finger(params, finger_crosssection, ring_num, ring_radius, finger_angle) {
         var path = [];
+        var twirl_amplitute = Math.cos((ring_num * 2 * Math.PI) / params.finger_twirl_period);
+        var twirl_angle = twirl_amplitute * params.finger_twirl_distance / (ring_radius * 2 * Math.PI);
         for (var finger_point = 0; finger_point <= params.finger_points; finger_point++) {
-          var angle = (finger_angle + params.finger_twirl * finger_point / params.finger_points) * 2 * Math.PI;
+          var finger_progress = finger_point / params.finger_points;
+          var angle = (finger_angle + twirl_angle * finger_progress) * 2 * Math.PI;
           var x = ring_radius * Math.cos(angle);
           var y = ring_radius * Math.sin(angle);
-          path.push([x, y, params.finger_height * finger_point / params.finger_points]);
+          path.push([x, y, params.finger_height * finger_progress]);
         }
         return nt3d.extrude(path, finger_crosssection, [0, 0, 1], nt3d.pathnormals_from_point(path, [0, 0, 0]));
       }
@@ -21,7 +24,7 @@
           var num_fingers = Math.round((ring_radius * 2 * Math.PI) / params.finger_spacing);
           for (var finger_num = 0; finger_num < num_fingers; finger_num++) {
             var finger_angle = finger_num / num_fingers;
-            fingers = fingers.concat(finger(params, finger_crosssection, ring_radius, finger_angle));
+            fingers = fingers.concat(finger(params, finger_crosssection, ring_num, ring_radius, finger_angle));
           }
         }
 
@@ -34,7 +37,8 @@
                     ["finger_radius", 3],
                     ["finger_faces", 3],
                     ["finger_points", 20],
-                    ["finger_twirl", .1, "Finger Twirl (in turns)"],
+                    ["finger_twirl_distance", 50],
+                    ["finger_twirl_period", 2, "Finger Twirl Period (1=same, 2=alternating)"],
                     ["finger_height", 100]];
     </script>
   </head>