From f39bbe4d0a4b3b556f93aecf5fee37974817dc12 Mon Sep 17 00:00:00 2001
From: Michael Krelin <hacker@klever.net>
Date: Sat, 27 Feb 2016 14:18:56 +0000
Subject: extended U from other projects

---
diff --git a/delta.jscad b/delta.jscad
index 326d172..35a777c 100644
--- a/delta.jscad
+++ b/delta.jscad
@@ -146,7 +146,36 @@ var U = {
  peek: function(x,m) {
   console.log(x,m);
   return x;
+ },
+ axes: function U_axes(o) {
+  if(!o) o = {};
+  var l = o.l||20, g = o.g||0.7;
+  return union([
+   CSG.roundedCylinder({start:[0,0,0],end:[l,0,0]}).setColor([1,0,0,g]),
+   CSG.roundedCylinder({start:[0,0,0],end:[0,l,0]}).setColor([0,1,0,g]),
+   CSG.roundedCylinder({start:[0,0,0],end:[0,0,l]}).setColor([0,0,1,g])
+  ]);
+ },
+ pextract: function U_pextract(a,pn) { // TODO: monkeypatch Array
+  return a.map(function(x){return x[pn]});
+ },
+ hole: function U_hole(o) {
+  var r = o.r||o.radius||(o.d/2)||(o.diameter/2);
+  var n = Math.max(Math.round(4*r),4);
+  return CSG.cylinder({
+   start: o.start, end: o.end,
+   radius: r/Math.cos(Math.PI/n),
+   resultion: n
+  });
+ },
+
+ upright: function U_upright() { return new CSG.Connector([0,0,0],[0,0,1],[1,0,0]) },
+ downright: function U_downright() { return new CSG.Connector([0,0,0],[0,0,-1],[1,0,0]) },
+ P: function U_P(x) {
+  if(!x.properties.P) return x;
+  return x.connectTo(x.properties.P,U.upright(),false,0);
  }
+ 
 };
 
 /* {h:,w:} */
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