Spline demo - All OPENSCAD

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Human: module spline\nSimple list of points becomes a soft spline passing through all points\npoint formats\n[x,y,z] or [x,y,z,scale] or [x,y,z,[xscale,yscale,zscale]]\nor [x,y,z,scale/[xscale,yscale,zscale],[r,g,b]]\nChildren\nIf the spline has zero children a stand-in sphere(1) will be assigned.\nFor children Z+ is the sweeping direction.\nhttps://openscadsnippetpad.blogspot.com/\nThe powerful part is to do things yourself\nThe format of points can be extended by any dimension or anything that tickles your fancy.\nit's really format-agnostic. Why not profiles? Mind that every point in the list has exactly the same format.\nConvert your ListOfPoints to spl format using v2spl(ListOfPoints).\nspl is simply a list of four-point bezier segments.\nUse spl2(HowFarAlong,SplListOfPoints); directly to query the spline.\ni usually do HowFarAlong as a 0-1, but that makes very many calls to len3spl(SplListOfPoints).\nInstead, you can do one len3spl(SplListOfPoints) and calculate your HowFarAlong point on the spline, then do your thing. The precision of len3spl is turned down to ten steps per segment for speed, which you can find in function len3bz()\nspl2(HowFarAlong,SplListOfPoints) returns a point in the same format as you made your list.\nspl2euler(HowFarAlong,SplListOfPoints) expects the first three values to be [x,y,z... and returns rotations like [0,Inclination ,Azimuth]. Steep inclinations will have the usual euler discontinuity flip artifacts around zenith. A workaround for now is to design on x or y axis and rotate up 90 degrees.