Issues #153 May 25, 2020 (23)

Ray Tracing In Notepad.exe At 30 FPS Amazing project. Use notepad as a ASCII display to render and play animation of an object to do ray tracing. One of cool thing is it search memory of a process, find a pattern to find the memory address that hold NotePad display text, and change it constantly to simulate re-rendering.

Using SQL to find my best photo of a pelican according to Apple Photos Apple Photos keeps photo metadata in a SQLite database. It runs machine learning models to identify the contents of every photo, and separate machine learning models to calculate quality scores for those photographs. All of this data lives in SQLite files on my laptop

A Complete Walkthrough to Using WebGL This guide is a complete, summarized WebGL tutorial, with tiny interactive demos in each chapter. Starting nearly from scratch, you’ll be able to create your own 3D interactive scenes without needing to use any library or framework: only vanilla JS & WebGL. My goal was to gather all the information and tricks about WebGL I found scattered everywhere,...

Implementing simple cooperative threads in C You don’t truly understand something until you’ve implemented it yourself, so I wanted to write an article that lets people play around with a simple thread implementation. In this post, we’ll implement simple threads in a normal C program (not an operating system).

The case of the missing DNS packets: a Google Cloud support story Troubleshooting is both a science and an art. The first step is to make a hypothesis about why something is behaving in an unexpected way, and then prove whether or not the hypothesis is correct. If the issue is too vague, then you need to brainstorm in order to narrow down the...

SSH Agent Explained What the agent is, how to use it, and how it works to keep your keys safe, how it works. reduce your risk when using agent forwarding, and an alternative to agent forwarding that you can use when accessing your internal hosts through bastions.

A beginner friendly introduction to prometheus 🔥 Prometheus is a monitoring and alerting system. It is very different from traditional system alerting where it scrape metric instead of you writing metric to it. When scraping, the data is pre-aggreated, so the way to query it is more about trending than individual event. Being different, it has a high learning curve.

Unpacking HP Firmware Updates The second of a four-part blog series documenting the different structures and stages of the firmware update. Looking in the blackbox, reverse engineer both of protocol to update and firmware format

Let's code a TCP/IP stack, 1: Ethernet & ARP Writing your own TCP/IP stack may seem like a daunting task. Indeed, TCP has accumulated many specifications over its lifetime of more than thirty years. The core specification, however, is seemingly compact1 - the important parts being TCP header parsing, the state machine, congestion control and retransmission timeout computation.