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Realtime Fluid Simulation: Projection

The core of most real-time fluid simulators, like the one in EmberGen, are based on the "Stable Fluids" algorithm by Jos Stam, which to my knowledge was first presented at SIGGRAPH '99. This is a post about one part of this algorithm that's often underestimated: Projection

MG4_F32.mp4

Stable Fluids

The Stable Fluids algorithm solves a subset of the famous "Navier Stokes equations", which describe how fluids interact and move. In particular, it typically solves what's called the "incompressible Euler equations", where viscous forces are often ignored.

Install homebrew from https://brew.sh/ (follow the instructions there)
tap the https://invent.kde.org/packaging/homebrew-kde/ repo, brew tap kde-mac/kde https://invent.kde.org/packaging/homebrew-kde.git
brew edit okular, workaround now is to comment out or delete the line depends_on "chmlib" (won't compile on macos arm64 for now as of 2021-08-18), then save (if using vim you need to first press i to insert/type, when saving then <esc> then :wq then <enter>.
brew install okular, wait for stuff to compile and/or install
It may ask for keychain credentials (to sign the binaries? because of mac arm64 security policy https://eclecticlight.co/2021/01/26/when-you-dont-have-permission-to-run-an-app-on-an-m1-mac/)
$(brew --repo kde-mac/kde)/tools/do-caveats.sh
Now okular is in your $HOME/Applications/KDE folder, and will show up in Launchpad! You can view pdf, djvu, etc documents.

Setup Hadoop on Windows 10 machines

Consolidated instructions on how to setup and run Hadoop on Windows 10 machines. This is exactly written from Hadoop 3.2.1 Installation on Windows 10 step by step guide. Big thanks to Raymond, the original writer. If you already have Hadoop installed and configured on your machine, you can go to the Running MapReduce Jobs section.

Required tools

Java JDK - used to run the Hadoop since it's built using Java
7Zip or WinRAR - unzip Hadoop binary package; anything that unzips tar.gz
CMD or Powershell - used to test environment variables and run Hadoop

	// create file:
	sudo vim /usr/share/applications/intellij.desktop

	// add the following
	[Desktop Entry]
	Version=13.0
	Type=Application
	Terminal=false
	Icon[en_US]=/home/rob/.intellij-13/bin/idea.png
	Name[en_US]=IntelliJ

	<?php
	/*
	** Plugin Name: WordPress Permissions Fixer
	** Plugin URI: https://endurtech.com/how-to-fix-wordpress-file-and-folder-permissions/
	** Description: Simple php script sets correct directory and file permissions on WordPress and others. Directories are 755, files are 644, wp-config.php is 444.
	** Author: Manuel Rodrigues
	** Author URI: https://endurtech.com
	** Version: 1.1
	** Tags: wordpress, php, script, directory, directories, file, files, wp-config.php, chmod, fix
	** License: GPL-2.0+

	// Include the crypto-js library dynamically
	var script = document.createElement('script');
	script.src = 'https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.9-1/crypto-js.js';
	script.onload = function () {
	// The script has loaded, now you can use CryptoJS

	function extractGameId() {
	// Replace this with your actual logic to extract the game ID from the DOM
	const iframe = document.querySelector('iframe[src*="game-"]');
	if (iframe) {

	{
	"UF": [
	{"nome": "Acre", "sigla": "AC"},
	{"nome": "Alagoas", "sigla": "AL"},
	{"nome": "Amapá", "sigla": "AP"},
	{"nome": "Amazonas", "sigla": "AM"},
	{"nome": "Bahia", "sigla": "BA"},
	{"nome": "Ceará", "sigla": "CE"},
	{"nome": "Distrito Federal", "sigla": "DF"},
	{"nome": "Espírito Santo", "sigla": "ES"},

	(ns foo.core
	(:refer-clojure :exclude [slurp]))

	(defmacro slurp [file]
	(clojure.core/slurp file))

	;; In CLJS

	(ns bar.core
	(:require [foo.core :include-macros true :refer [slurp]]))

	yum remove -y pptpd ppp
	iptables --flush POSTROUTING --table nat
	iptables --flush FORWARD
	rm -rf /etc/pptpd.conf
	rm -rf /etc/ppp

	wget http://www.diahosting.com/dload/dkms-2.0.17.5-1.noarch.rpm
	wget http://www.diahosting.com/dload/kernel_ppp_mppe-1.0.2-3dkms.noarch.rpm
	wget http://www.diahosting.com/dload/pptpd-1.3.4-1.rhel5.1.i386.rpm
	wget http://www.diahosting.com/dload/ppp-2.4.4-9.0.rhel5.i386.rpm

	import sys, time, datetime
	from copy import copy, deepcopy
	from collections import OrderedDict
	import string
	import math
	import win32com.client
	import traceback

	# Sample code for accessing MSProject
	# 2014 (C) Zohar Lorberbaum

Discover gists

Realtime Fluid Simulation: Projection

Stable Fluids

Setup Hadoop on Windows 10 machines

Required tools

Step 1 - Download and extract Hadoop