git.scottworley.com Git - nt3d/blame_incremental

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Commit	Line	Data
	1	<html>
	2	<head>
	3	<title>The Thing the Rostock Was Printing in Make Magazine</title>
	4	<script type="text/javascript" src="nt3d.js"></script>
	5	<script type="text/javascript">
	6	function pointy_sin(x) {
	7	// Similar to sin(x*pi) over the range [-1,1],
	8	// but with more movement towards the extremes.
	9	// https://plus.google.com/101508799331795210529/posts/Yg7LmV8BpTw
	10	return 3.7x + (Math.log(1-.95x)-Math.log(.95*x+1));
	11	}
	12	function rmm(params) {
	13	var tau = Math.PI*2;
	14	var path = [];
	15	// Short arc
	16	for (var i = 0; i < params.steps_along; i++) {
	17	var progress = i/params.steps_along;
	18	var x_separation = Math.cos(progresstau/2)params.base_separation;
	19	var y_offset = -Math.sin(progresstau/4)params.base_offset;
	20	var y_arc = Math.sin(progresstau)params.width;
	21	var z_arc = -Math.cos(progresstau)params.short_arc_height + params.short_arc_height;
	22	path.push([x_separation, y_offset + y_arc, z_arc]);
	23	}
	24	// Tall arc
	25	for (var i = 0; i < params.steps_along; i++) {
	26	var progress = i/params.steps_along;
	27	var x_arc = -Math.cos(progresstau1.5)*params.base_separation;
	28	var y_offset = -Math.cos(progresstau/4)params.base_offset;
	29	var y_twist = -pointy_sin(progress2 - 1)params.width/2;
	30	var z_arc = -Math.cos(progresstau)params.tall_arc_height + params.tall_arc_height;
	31	path.push([x_arc, y_offset + y_twist, z_arc]);
	32	}
	33	return nt3d.closed_extrude(
	34	path,
	35	nt3d.circle(params.tube_width, params.steps_around),
	36	nt3d.shapenormals_from_closed_path(path),
	37	nt3d.pathnormals_from_point(path, [0,0,0]));
	38	}
	39	var params = [["base_separation", 30],
	40	["base_offset", 10],
	41	["width", 40],
	42	["short_arc_height", 60],
	43	["tall_arc_height", 80],
	44	["tube_width", 10],
	45	["steps_along", 70, "Steps Along Each Arc"],
	46	["steps_around", 12]];
	47	</script>
	48	</head>
	49	<body onload="nt3d.framework(rmm, params)">
	50	<h1>The Thing the Rostock Was Printing in Make Magazine</h1>
	51	<p><a href="http://www.flickr.com/photos/jcrocholl/8065968929/sizes/l/in/photostream/">This thing</a>.</p>
	52	<!-- My notes after staring at it:
	53	x y z
	54	1 0 0 Bottom front
	55	.5 1 .5s 1/4 up short arc
	56	0 0 s Top of short arc
	57	-.5 -1 .5s Coming down short arc
	58	-1 0 0 Bottom back
	59	1 .33 .5t 1/4 up long arc
	60	0 0 t Top of tall arc
	61	-1 -.33 .5t Coming down tall arc
	62	1 0 0 Bottom front (Repeated from above)
	63
	64	x = cos over 1/2 period for short arc, -cos over 1.5 periods for tall arc
	65	y = sin over 1 period for short arc, sin/3 over 1 period for tall arc
	66	z = -cos over 1 period for short arc, -cos over 1 period for tall arc
	67	-->
	68	</body>
	69	</html>
	70