cylinder2 - extend OpenSCAD cylinder/circle to other round shapes

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Drawing tubes, pipes, pie segments, 'D' shafts and more in 1 line of OpenSCAD ============================================================ OR Extending OpenSCAD 'cylinder' and 'circle' primitives ---------------------------------------------------------------------------- According to Plato <I>"Necessity is the mother of invention"</I> as so it was for me. I needed a 'D' shaped hole to fit over the same shape on a motor shaft. I also needed curved slots to allow mounting bolts, arranged in a cicle, to be adjusted by rotating them as a group. Solution: Extend the 'circle' and 'cylinder' OpenSCAD primitives In cylinder2.scad are 2 new functions 'cylinder2' and 'circle2' 'circle2' can do everything that 'circle' does given the same parameters and much MORE. 'cylinder2' can do everything that 'cylinder' does given the same parameters and much MORE all in one call. Draw a tube or pipe is much easier (no need to use difference): `cylinder2(h=20,d=20,ri=8); // A tube with Radius Inside = 8` Draw a 'D' shaped cylinder: `cylinder2(h=10,d=15,deg=280); // Cylinder with DEG = 280 rounded ` Draw a pie segment: `cylinder2(h=20,d=20,deg=55,efn=2); // Half cylinder (from 0 to 55 DEGrees), End faces number = 2` Draw a curved bar: `cylinder2(h=20,d=20,ri=5,deg=80,sd=45,efn=0,$fn=7); // Tube 45-125, straight ends, 7 faces` To use it: Download cylinder2.scad and place it with your scad files or in your OpenSCAD library directory Add the next line to you .scad file: `use <cylinder2.scad>;` Then use 'cylinder2' and/or 'circle2' See the other examples and a large list in cylinder2-all