Widening

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

index 7a4babd9e69a8eaca8940dd1a4c998c694e6f091..d96ec35d47d28a3f1b62295bb88b9e4a5e4a1927 100644 (file)
--- a/medusa.html
+++ b/medusa.html
@@ -7,11 +7,15 @@
          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);
          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);
+        var widen_scale = params.widen_amount / (Math.exp(params.widen_sharpness) - 1);
          for (var finger_point = 0; finger_point <= params.finger_points; finger_point++) {
          for (var finger_point = 0; finger_point <= params.finger_points; finger_point++) {
-          var angle = (finger_angle + twirl_angle * finger_point / params.finger_points) * 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]);
+          var finger_progress = finger_point / params.finger_points;
+          var angle = (finger_angle + twirl_angle * finger_progress) * 2 * Math.PI;
+          var r = ring_radius + widen_scale * Math.exp(finger_progress * params.widen_sharpness);
+          var x = r * Math.cos(angle);
+          var y = r * Math.sin(angle);
+          var z = params.finger_height * finger_progress;
+          path.push([x, y, z]);
          }
          return nt3d.extrude(path, finger_crosssection, [0, 0, 1], nt3d.pathnormals_from_point(path, [0, 0, 0]));
        }
          }
          return nt3d.extrude(path, finger_crosssection, [0, 0, 1], nt3d.pathnormals_from_point(path, [0, 0, 0]));
        }
@@ -38,7 +42,9 @@
                      ["finger_points", 20],
                      ["finger_twirl_distance", 50],
                      ["finger_twirl_period", 2, "Finger Twirl Period (1=same, 2=alternating)"],
                      ["finger_points", 20],
                      ["finger_twirl_distance", 50],
                      ["finger_twirl_period", 2, "Finger Twirl Period (1=same, 2=alternating)"],
-                    ["finger_height", 100]];
+                    ["finger_height", 100],
+                    ["widen_sharpness", 2, "Widen Sharpness (0=disable widening)"],
+                    ["widen_amount", 30]];
      </script>
    </head>
    <body onload="nt3d.framework(medusa, params)">
      </script>
    </head>
    <body onload="nt3d.framework(medusa, params)">