K-Francis-H’s gists

K-Francis-H / ACM_broom_thread_mask.scad

Last active October 26, 2024 05:28

	include <BOSL2/std.scad>
	include <BOSL2/threading.scad>


	UNIT="imperial"; // [imperial, metric]
	THREAD_LENGTH_INCHES=1.25;
	THREAD_LENGTH_MM=31.75;

	module broom_thread_internal_mask(length){
	INCH=25.4;//mm

K-Francis-H / ogive.scad

Created April 21, 2024 02:19

	//OpenSCAD module to create an ogive of given length for a given circle diameter (gauge)
	GAUGE13=2.3;//mm
	module ogive(gauge=GAUGE13, length=10){
	//gauge -> the DIAMATER of spoke
	//length the fin or ogive length FROM THE CENTER of the spoke
	gr = gauge/2; //gauge radius
	chord = length * 2; //length is 1/2 of a chord forming a right triangle along with large_radius as hypotenuse and (large_radius - gauge radius) as opposite
	large_radius = (chord)^2 / (8 * gr) + (gr / 2);
	large_d = large_radius * 2;

K-Francis-H / mp42gif.sh

Created January 2, 2024 20:05

mp4->gif

	#!/bin/sh

	ffmpeg \
	-i $1 \
	-r 15 \
	-vf "scale=320:-1,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" \
	-ss 00:00:00 -to 00:00:01 \
	$2

K-Francis-H / reusable_mold_box.scad

Created February 15, 2022 05:19

A reusable 3D printable mold box. Clamp the sides, tape a part to the bottom and mold it with silicone

	module mold_base(len, width, height, thickness){
	//floor with extra space for the walls, base corners cutout
	difference(){
	cube([len+2thickness,width+2thickness, thickness]);
	union(){
	cube(thickness);

	translate([len+thickness, 0, 0])
	cube(thickness);

K-Francis-H / named_seed.scad

Created January 28, 2022 21:11

A poly rolling hash implementation in OpenSCAD. Useful for making procedurally generated 3D objects with named seed values.

	function poly_rolling_hash(seed, idx, hash, ppow, p, m) = len(seed) == idx ?
	hash :
	poly_rolling_hash(seed, idx+1, (hash + (ord(seed[idx]) - ord("a") + 1) * ppow) % m, (ppow * p) % m, p, m);

	function seed_from_string(string) = poly_rolling_hash(string, 0, 0, 1, 31, pow(10,9)+9);

	//how to use:
	rand_val = rands(0, 100, 1, seed_value=seed_from_string("human readable seed") );

K-Francis-H / prettySize.js

Created February 3, 2021 19:36

	function prettySize(bytes){
	let index = 0;
	let suffixes = ["B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"];
	while(bytes > 1000){
	bytes = bytes/1000;
	index++;
	}
	return bytes.toFixed(2)+suffixes[index];
	}

K-Francis-H / list_local_ips.sh

Created December 22, 2020 20:40

	#!/bin/sh

	IPs=$(sudo arp-scan -l -q \| awk '{print $1}' \| grep -E [0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\} )
	for ip in $IPs
	do
	#nmap -O $ip
	echo $ip
	done

K-Francis-H / path_tracer.scad

Created November 23, 2020 19:46

	//given a list of 3 element vectors and the size for each node(cylinder diameter)
	//this will generate a path going through each point. Especially useful for
	//generating models from GPX and KML files for overlaying trail geometry on top
	//of terrain
	module tracePath(path, size){
	for(i=[0:len(path)-1]){
	if(i+1 < len(path)){
	hull(){
	translate(path[i])
	cylinder(d=size);

K-Francis-H / uuid.sh

Created August 24, 2018 18:19

UUID generator in BASH

	#!/bin/sh
	echo $(cat /proc/sys/kernel/random/uuid)

K-Francis-H / display_heightmap.m

Last active February 16, 2017 03:14

GNU Octave script to load SRTM1 and SRTM3 data and print a grayscale image of the data

	#!/usr/bin/octave -qf

	%usage: ./display_heightmap.m FILENAME FILETYPE

	args = argv();
	file_name = args{1};
	file_type = args{2}; %should be one of {"srtm1", "srtm3"}%

	if(file_type == "srtm1")
	size = 3601;

_ K-Francis-H