// https://plus.google.com/101508799331795210529/posts/Yg7LmV8BpTw
return 3.7*x + (Math.log(1-.95*x)-Math.log(.95*x+1));
}
- function rmm(base_separation, base_offset,
- width, short_arc_height, tall_arc_height,
- tube_width, steps_along, steps_around) {
+ function rmm(params) {
var tau = Math.PI*2;
var path = [];
// Short arc
- for (var i = 0; i < steps_along; i++) {
- var progress = i/steps_along;
- var x_separation = Math.cos(progress*tau/2)*base_separation;
- var y_offset = -Math.sin(progress*tau/4)*base_offset;
- var y_arc = Math.sin(progress*tau)*width;
- var z_arc = -Math.cos(progress*tau)*short_arc_height + short_arc_height;
+ for (var i = 0; i < params.steps_along; i++) {
+ var progress = i/params.steps_along;
+ var x_separation = Math.cos(progress*tau/2)*params.base_separation;
+ var y_offset = -Math.sin(progress*tau/4)*params.base_offset;
+ var y_arc = Math.sin(progress*tau)*params.width;
+ var z_arc = -Math.cos(progress*tau)*params.short_arc_height + params.short_arc_height;
path.push([x_separation, y_offset + y_arc, z_arc]);
}
// Tall arc
- for (var i = 0; i < steps_along; i++) {
- var progress = i/steps_along;
- var x_arc = -Math.cos(progress*tau*1.5)*base_separation;
- var y_offset = -Math.cos(progress*tau/4)*base_offset;
- var y_twist = -pointy_sin(progress*2 - 1)*width/2;
- var z_arc = -Math.cos(progress*tau)*tall_arc_height + tall_arc_height;
+ for (var i = 0; i < params.steps_along; i++) {
+ var progress = i/params.steps_along;
+ var x_arc = -Math.cos(progress*tau*1.5)*params.base_separation;
+ var y_offset = -Math.cos(progress*tau/4)*params.base_offset;
+ var y_twist = -pointy_sin(progress*2 - 1)*params.width/2;
+ var z_arc = -Math.cos(progress*tau)*params.tall_arc_height + params.tall_arc_height;
path.push([x_arc, y_offset + y_twist, z_arc]);
}
return nt3d.closed_extrude(
path,
- nt3d.circle(tube_width, steps_around),
+ nt3d.circle(params.tube_width, params.steps_around),
nt3d.shapenormals_from_closed_path(path),
nt3d.pathnormals_from_point(path, [0,0,0]));
}
- var params = [["Base separation", 30],
- ["Base offset", 10],
- ["Width", 40],
- ["Short arc height", 60],
- ["Tall arc height", 80],
- ["Tube width", 10],
- ["Steps along each arc", 70],
- ["Steps around", 12]];
+ var params = [["base_separation", 30],
+ ["base_offset", 10],
+ ["width", 40],
+ ["short_arc_height", 60],
+ ["tall_arc_height", 80],
+ ["tube_width", 10],
+ ["steps_along", 70, "Steps Along Each Arc"],
+ ["steps_around", 12]];
</script>
</head>
<body onload="nt3d.framework(rmm, params)">
projects / nt3d / blobdiff