cyber-murmel

$fn = 90;

control_points = [[0, 0], [10, 0], [20, 20], [30, 00], [40, 0]];

function line(end_points, t) = end_points[0]+t*(end_points[1]-end_points[0]);

function bezier(control_points, t) = len(control_points) == 2 ? 
    line(control_points, t) :
    bezier([
        for (i = [0: len(control_points)-2])

cyber-murmel

#!/usr/bin/env python3.10

from argparse import ArgumentParser, Action, FileType, ArgumentError, ArgumentTypeError, Namespace
from logging import debug, info, warning, error, exception
from logging import DEBUG, INFO, WARNING, ERROR
from coloredlogs import install as color_log

def parse_arguments():
    parser = ArgumentParser(
        description="",

cyber-murmel

let
  nixpkgs_rev = "51063ed4f2343a59fdeebb279bb81d87d453942b"; # nixos-23-11 on 2024-03-13
  fenix_rev = "df74cae97f59a868ad355af6a703e7845d0ae648"; # main on 2024-03-13
in

{ pkgs ? import (builtins.fetchTarball "https://github.com/NixOS/nixpkgs/archive/${nixpkgs_rev}.tar.gz") { }
, fenix ? import (builtins.fetchTarball "https://github.com/nix-community/fenix/archive/${fenix_rev}.tar.gz") { }
}:

with pkgs;

cyber-murmel

Download the [CD image archive](https://archive.org/details/LegoLoco).
```shell
# Turn into iso
bchunk Lego\ Loco.bin Lego\ Loco.cue Lego_Loco
# Turn iso into loop device and mount
udisksctl loop-setup -r -f Lego_Loco.iso01.iso
udisksctl mount -b /dev/loop0
```

cyber-murmel

$fn = 90;

function base_face (D_maj, H) = [for(angle = [0: 360/$fn: 360-360/$fn]) [
    cos(angle)*(D_maj/2 + H/8 - abs((angle-180)/180* H)),
    sin(angle)*(D_maj/2 + H/8 - abs((angle-180)/180* H))
  ]];

module rod(D_maj = 8, P = 1.25, h = 20) {
  H = P * sin(60);
  /* linear extude thread */