For more information on these special variables look at: OpenSCAD_User_Manual/Other_Language_Features d Diameter. The resolution of the sphere is based on the size of the sphere and the $fa, $fs and $fn variables. center false (default), 1st (positive) octant, one corner at (0,0,0) true, cube is centered at (0,0,0) default values: cube() yields: cube(size =, center = false) Ĭreates a sphere at the origin of the coordinate system. Parameters: size single value, cube with all sides this length 3 value array, cube with dimensions x, y and z. Argument names are optional if given in the order shown here.Ĭube(size =, center = true/false) When center is true, the cube is centered on the origin. 4.3 Point repetitions in a polyhedron point listĬreates a cube in the first octant.Probably 4+ hours all up, but I’m glad I did it. Each piece had to be laser cut, then peeled, cleaned and painted, then dried in a special rack, and any overflow paint scraped off. This one looks pretty, but was the most time consuming to make. After testing it, though, it seemed to distract attention away from the actual shape, so I took it out again. I originally put the holes in the vectors so that a cord or rope could be threaded through each. The layered effect is quite nice, and could even be explained as having a direct physical interpretation relating to detector aperture size. The central axis makes the idea of it being a ‘vector’ jump out at you. This method is the most intuitive of the lot. My code calculates the spiral, then for a given material size, plots the X or Y plane intercepts, and directly outputs an SVG for lasercutting: My prototype started with both an X and Y plane as support, but then I realised that the wire was rigid enough to stand with only a single vertical board. Being able to measure ahead of time, and not have to guess and feed an extra two meters of slack through a hole a hundred times makes all the difference Feeding the wire through the frame is arduous, and short lengths are much easier to handle than long ones. My code gives estimates on the wire length, which was invaluable. It’s quite time consuming to make, and a bit delicate afterwards, but it has a lovely 3D feel that the others don’t. This was my first attempt, and I absolutely love it. Although there’s something funny going on with the join at the base? So you might want to double check the STL for errors before getting it printed professionally. Of course it was only a 1-line workaround, and the model now works. Then I had to slap myself as I realised that software that has default units of millimetres is unlikely to understand the idea of an imaginary number □ I wonder if I’m the first user to want it? (I should totally have filed a humorous bug report/feature request…) Most of the maths functions I needed were already there and seemed to match ordinary C, but I was confused when I couldn’t find anything for complex maths. I made the STLs for this by re-implementing my python code in OpenSCAD. The deluxe set would be 2 earrings and a necklace, maybe? What science aficionado wouldn’t want to grace their symposium’s dinner adorned by these?īig thanks to Erik for printing these models on his resin printer, when my attempts on various FDM printers failed or were too encumbered by support material to come out nicely. After you’ve seen the animation it’s obvious that the horizontal slices are the complex plane, and how the first two spirals are added to create the third spiral, but it’s not necessarily something you’d see without being told.Īlso, I think this is just begging to be made into jewellery. This is probably the prettiest, but is also not quite as intuitive as the others. Some are suited to be big classroom models, whereas others are more in the realm of desk art. I spent about a month or so trying out various methods for making the spirals. I’ll also include links for anyone that wants to make their own, as well as a jupyter notebook that was used to do all the calculations. So after playing around with the Feynman Amplitude Spiral and plotting the shape on the computer, I realised I really, really, really wanted my own tangible version of it.
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