git.scottworley.com Git - nt3d/blob

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>