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[nt3d] / medusa.html
1 <html>
2 <head>
3 <title>Medusa</title>
4 <script type="text/javascript" src="nt3d.js"></script>
5 <script type="text/javascript">
6 function finger(params, finger_crosssection, ring_num, ring_radius, finger_angle) {
7 var path = [];
8 var twirl_amplitute = Math.cos((ring_num * 2 * Math.PI) / params.finger_twirl_period);
9 var twirl_angle = twirl_amplitute * params.finger_twirl_distance / (ring_radius * 2 * Math.PI);
10 var widen_scale = params.widen_amount / (Math.exp(params.widen_sharpness) - 1);
11 for (var finger_point = 0; finger_point <= params.finger_points; finger_point++) {
12 var finger_progress = finger_point / params.finger_points;
13 var angle = (finger_angle + twirl_angle * finger_progress) * 2 * Math.PI;
14 var r = ring_radius + widen_scale * Math.exp(finger_progress * params.widen_sharpness);
15 var x = r * Math.cos(angle);
16 var y = r * Math.sin(angle);
17 var z = params.finger_height * finger_progress;
18 path.push([x, y, z]);
19 }
20 return nt3d.extrude(path, finger_crosssection, [0, 0, 1], nt3d.pathnormals_from_point(path, [0, 0, 0]));
21 }
22 function medusa(params) {
23 var finger_crosssection = nt3d.circle(params.finger_radius, params.finger_faces);
24 var fingers = [];
25 for (var ring_num = 0; ring_num < params.num_rings; ring_num++) {
26 var ring_radius = params.first_ring_radius + ring_num * params.ring_spacing;
27 var num_fingers = Math.round((ring_radius * 2 * Math.PI) / params.finger_spacing);
28 for (var finger_num = 0; finger_num < num_fingers; finger_num++) {
29 var finger_angle = finger_num / num_fingers;
30 fingers = fingers.concat(finger(params, finger_crosssection, ring_num, ring_radius, finger_angle));
31 }
32 }
33
34 return fingers;
35 }
36 var params = [["first_ring_radius", 20],
37 ["num_rings", 4],
38 ["ring_spacing", 10, "Space Between Rings"],
39 ["finger_spacing", 10],
40 ["finger_radius", 3],
41 ["finger_faces", 3],
42 ["finger_points", 20],
43 ["finger_twirl_distance", 50],
44 ["finger_twirl_period", 2, "Finger Twirl Period (1=same, 2=alternating)"],
45 ["finger_height", 100],
46 ["widen_sharpness", 2, "Widen Sharpness (0=disable widening)"],
47 ["widen_amount", 30]];
48 </script>
49 </head>
50 <body onload="nt3d.framework(medusa, params)">
51 <h1>Medusa</h1>
52 <p>An artsy thing.</p>
53 </body>
54 </html>