closed_quadstrip: function(strip) {
return this.quadstrip(strip.concat([strip[0], strip[1]]));
},
+ circle: function(r, n) {
+ var points = [];
+ for (var i = 0; i < n; i++) {
+ points.push([r*Math.cos(2*Math.PI*i/n),
+ r*Math.sin(2*Math.PI*i/n),
+ 0]);
+ }
+ return points;
+ },
extrude: function(shape, path, shapenormals, pathnormals) {
var guts_result = nt3d._extrude_guts(shape, path, shapenormals, pathnormals);
// Add the end-caps
--- /dev/null
+<html>
+ <head>
+ <title>Torus by extrude</title>
+ <script type="text/javascript" src="nt3d.js"></script>
+ <script type="text/javascript">
+ function torus_by_extrude(torus_radius, cross_section_radius, long_steps, short_steps) {
+ var cross_section = nt3d.circle(cross_section_radius, short_steps);
+ var path = nt3d.circle(torus_radius, long_steps);
+ var cross_section_normals = nt3d.rotate_about_origin(path, [0,0,1], Math.PI/2);
+ var path_normals = [];
+ path_normals.length = long_steps;
+ for (var i = 0; i < long_steps; i++) {
+ path_normals[i] = [0, 0, 1];
+ }
+ return nt3d.closed_extrude(cross_section, path, cross_section_normals, path_normals);
+ }
+ var params = [["Torus radus", 100],
+ ["Cross section radius", 40],
+ ["Steps around the long way", 50],
+ ["Steps around the short way", 16]];
+ </script>
+ </head>
+ <body onload="nt3d.framework(torus_by_extrude, params)">
+ <h1>Torus by extrude</h1>
+ <p>Make a torus by extruding a circle.</p>
+ </body>
+</html>
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