openjscad-aurora-webapp

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// title: Chain Hull
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// author: Rene K. Mueller
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// date: 2013/04/18
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// description: Whosa whatsis suggested "Chain Hull" as described at 
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//    https://plus.google.com/u/0/105535247347788377245/posts/aZGXKFX1ACN
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function main() {
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   var o = [], p = [];
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   for(var i=0; i<12; i++) {           // -- shell like
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      var x = sin(i/12*180)*10;
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      var y = cos(i/12*180)*10;
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      o.push(circle({center: true}).scale(6-i/2).translate([x,y,0]));
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   }
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   var n = 6;
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   for(var i=0; i<n; i++) {            // -- hexagon chain hulled
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      var x = sin(i/n*360)*10;
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      var y = cos(i/n*360)*10;
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      p.push(circle({center: true}).translate([x,y,0]));
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   }
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   return [
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      linear_extrude({height: 5}, chain_hull(o)).translate([-20,0,0]), 
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      chain_hull(o), 
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      union(o).translate([20,0,0]),
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      linear_extrude({height: 5}, chain_hull({closed: true}, p)).translate([-25,40,0]), 
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      chain_hull({closed: true}, p).translate([0,40,0]),
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      union(p).translate([25,40,0])
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   ];
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}
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