https://peertube.v1.root42.de/videos/watch/c2579068-f37b-4f9c-b99b-e076bf4fc0fa In 1993 the Future Crew released the seminal demo “Second Reality”. One of the more simple effects they showed in this demo was the “Dot Tunnel”. It is a simple, yet mesmerizing oldskool demo effect. We can build on our knowledge of fixed point maths to implement this effect and maybe even improve on the original! Support me on Patreon: https://www.patreon.com/root42 Support me on Ko-Fi: https://ko-fi.com/root42 Support me on PayPal: https://paypal.me/ArneSchmitz Support me on YouTube: https://www.youtube.com/channel/UCPjFa_UZBUDzdJTIEdyGjIQ/join Music: A Little Wonder by Spino2006 Source code: https://github.com/root42/dostunnl 0:00 Introduction 1:20 The Code Stub 3:15 Lissajous 8:40 Precomputed Tunnel 16:20 Drawing The Tunnel 24:12 THE DEMO 26:00 Closing words #demoscene #letscode #msdos #retrocomputing #programming Tue, 04 Aug 2026 22:24:54 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://peertube.v1.root42.de https://peertube.v1.root42.de/lazy-static/avatars/0a35d55b-bc46-4c59-b95d-8410012a3183.jpg https://peertube.v1.root42.de/videos/watch/c2579068-f37b-4f9c-b99b-e076bf4fc0fa All rights reserved, unless otherwise specified in the terms specified at https://peertube.v1.root42.de/about and potential licenses granted by each content's rightholder.