<title>Wrap Sphere</title>
<script type="text/javascript" src="nt3d.js"></script>
<script type="text/javascript">
- function wrap_sphere(sphere_radius, extrusion_radius, turns, circle_angle, aspect_ratio, distortion_angle, steps_around, steps_along) {
+ function wrap_sphere(params) {
// Spiral path along sphere surface
var path = [];
- for (var i = 0; i < steps_along; i++) {
- var progress_0to2 = i / (steps_along/2);
+ for (var i = 0; i < params.steps_along; i++) {
+ var progress_0to2 = i / (params.steps_along/2);
var progress_0to1andback = progress_0to2 < 1 ? progress_0to2 : 2 - progress_0to2;
var progress_neg1to1andback = progress_0to1andback * 2 - 1;
- var z = progress_neg1to1andback * sphere_radius;
- var r = Math.sqrt(sphere_radius*sphere_radius - z*z);
+ var z = progress_neg1to1andback * params.sphere_radius;
+ var r = Math.sqrt(params.sphere_radius*params.sphere_radius - z*z);
var phase_adjust = progress_0to2 < 1 ? 0 : Math.PI;
- var x = r*Math.cos(progress_0to1andback*turns*2*Math.PI + phase_adjust);
- var y = r*Math.sin(progress_0to1andback*turns*2*Math.PI + phase_adjust);
+ var x = r*Math.cos(progress_0to1andback*params.turns*2*Math.PI + phase_adjust);
+ var y = r*Math.sin(progress_0to1andback*params.turns*2*Math.PI + phase_adjust);
path.push([x,y,z]);
}
// Shape to be extruded
- var shape = nt3d.circle(extrusion_radius, steps_around);
- shape = nt3d.rotate_about_origin(shape, [0,0,1], circle_angle*Math.PI*2);
+ var shape = nt3d.circle(params.extrusion_radius, params.steps_around);
+ shape = nt3d.rotate_about_origin(shape, [0,0,1], params.circle_angle*Math.PI*2);
for (var i = 0; i < shape.length; i++) {
- shape[i][0] *= aspect_ratio;
+ shape[i][0] *= params.aspect_ratio;
}
- shape = nt3d.rotate_about_origin(shape, [0,0,1], distortion_angle*Math.PI*2);
+ shape = nt3d.rotate_about_origin(shape, [0,0,1], params.distortion_angle*Math.PI*2);
return nt3d.closed_extrude(
path,
nt3d.shapenormals_from_closed_path(path),
nt3d.pathnormals_from_point(path, [0, 0, 0]));
}
- var params = [["Sphere radius", 100],
- ["Extrusion radius", 5],
- ["Turns", 3],
- ["Angle of circle (in turns) (useful when steps_around is small)", .125],
- ["Aspect ratio", 2],
- ["Angle of distortion (in turns)", .25],
- ["Steps around", 4],
- ["Steps along", 500]];
+ var params = [["sphere_radius", 100],
+ ["extrusion_radius", 5],
+ ["turns", 3],
+ ["circle_angle", .125, "Angle of circle (in turns) (useful when steps_around is small)"],
+ ["aspect_ratio", 2],
+ ["distortion_angle", .25, "Distortion Angle (in turns)"],
+ ["steps_around", 4],
+ ["steps_along", 500]];
</script>
</head>
<body onload="nt3d.framework(wrap_sphere, params)">
projects / nt3d / blobdiff