Will Ware wware

OpenSCAD on the Linux box is faster than on the Macbook, I think, but it won't do recursion. Recursion must be done in Python. So the Sierpinski code must be rewritten as a Python script or an exercise in SolidPython that generates OpenSCAD.

The Linux version of OpenSCAD has a few other differences. Cylinders (and possibly spheres) don't support diameter arguments, only radius arguments. Anyway, I'm adding a Python script to perform the recursion and produce a flat *.scad file.

Or instead of all this nonsense resulting from the fact that the OpenSCAD in the Ubuntu repository is old and broken, you could just go to the download page and get a version that works correctly.

Fun hacks with OpenSCAD

Hack the First

Use OpenSCAD to take a slice from a 3D object and convert it to a 2D DXF file, suitable for laser cutting.

	#!/usr/bin/python

	import serial
	import sys
	import select
	import os

	ser=serial.Serial('/dev/ttyUSB0',115200)

	BUF=4096

	#!/usr/bin/env python

	"""
	Example usage:
	find . -type f \| head -3000 \| ./suffixes.py
	Use this to build a swish.conf file for swish-e, e.g:
	IndexDir .
	IndexOnly .h .qml .cpp .png .pro .qmlproject .svg .jpg .qdoc .qrc .json .js .sci .xml .pri .desktop .txt
	IndexContents TXT* .h .qml .cpp .png .pro .qmlproject .svg .jpg .qdoc .qrc .json .js .sci .xml .pri .desktop .txt
	"""

	class LinearRegression:
	"""
	>>> lr = LinearRegression()
	>>> lst = [(0., 0.)]
	>>> lr.add(lst[0][0], lst[0][1])
	>>> lr.get()
	>>> lr.error()
	>>> for nxt in [(1., 1.), (2., 2.), (4., 3.), (-1., -0.5)]:
	... lst.append(nxt)
	... lr.add(nxt[0], nxt[1])

	from functools import wraps

	# A decorator without an argument.

	def add_four(f):
	@wraps(f)
	def wrapped(x):
	y = f(x)
	return y + 4
	return wrapped

	# Can we do a JavaScript-like .then() hack in Python?

	import threading
	import time


	class Sleeper(threading.Thread):
	def __init__(self):
	super(Sleeper, self).__init__()
	self.f = None

	module home_depot_bucket() {
	translate([0,0,14.25])
	difference() {
	cylinder(h=1/4, d=14, $fn=30);
	cylinder(h=1/4, d=12, $fn=30);
	}
	difference() {
	cylinder(h=14.5, d1=10.5, d2=12.5, $fn=30);
	translate([0,0,1/4])
	cylinder(h=14.5, d1=10, d2=12, $fn=30);

	from math import cos, sin, atan2

	class Circle:
	def __init__(self, x, y, radius):
	self.x, self.y, self.radius = x, y, radius

	def intersect_circles(first, second):
	"""
	>>> intersect_circles(Circle(0, 0, 1), Circle(1, 1, 1))
	((1.5700924586837752e-16, 1.0), (1.0, 0.0))