<title>Medusa</title>
<script type="text/javascript" src="nt3d.js"></script>
<script type="text/javascript">
+ 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);
+ var widen_scale = params.widen_amount / (Math.exp(params.widen_sharpness) - 1);
+ for (var finger_point = 0; finger_point <= params.finger_points; finger_point++) {
+ 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]));
+ }
function medusa(params) {
var finger_crosssection = nt3d.circle(params.finger_radius, params.finger_faces);
var fingers = [];
for (var ring_num = 0; ring_num < params.num_rings; ring_num++) {
var ring_radius = params.first_ring_radius + ring_num * params.ring_spacing;
- for (var finger_num = 0; finger_num < params.num_fingers; finger_num++) {
- var finger_angle = finger_num / params.num_fingers;
- var path = [];
- 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 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 = nt3d.extrude(path, finger_crosssection, [0, 0, 1], nt3d.pathnormals_from_point(path, [0, 0, 0]));
- fingers = fingers.concat(finger);
+ 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_num, ring_radius, finger_angle));
}
}
return fingers;
}
var params = [["first_ring_radius", 20],
- ["num_rings", 10],
+ ["num_rings", 4],
["ring_spacing", 10, "Space Between Rings"],
- ["num_fingers", 5],
+ ["finger_spacing", 10],
["finger_radius", 3],
- ["finger_faces", 5],
+ ["finger_faces", 3],
["finger_points", 20],
- ["finger_twirl", .1, "Finger Twirl (in turns)"],
- ["finger_height", 100]];
+ ["finger_twirl_distance", 50],
+ ["finger_twirl_period", 2, "Finger Twirl Period (1=same, 2=alternating)"],
+ ["finger_height", 100],
+ ["widen_sharpness", 2, "Widen Sharpness (0=disable widening)"],
+ ["widen_amount", 30]];
</script>
</head>
<body onload="nt3d.framework(medusa, params)">
projects / nt3d / blobdiff