Portal RTX Review: The Path-Traced Retro Revolution Begins!

Portal RTX is our first look at RTX Remix, which has the potential to revolutionise older PC games, transforming them into RT showcases. This particular release dramatically modernises the Valve classic with all-new assets and a fully path-traced pipeline, transforming the look of the game. But what is path-tracing compared to the hybrid RT approach seen in most titles? And how much GPU RT power do you need for a good experience. Join the DF Supporter Program for pristine video downloads, behind the scenes content, early access to DF Retro, early access to DF Direct Weekly and much, much more: Subscribe for more Digital Foundry: Want some DF-branded tee-shirts, mugs, hoodies or pullovers? Check out our store: 00:00:00 Introduction 00:00:58 RTX Remix for Remastering Old Games 00:02:35 What is Path Tracing? 00:03:47 Path Tracing Details - Primary Visibility 00:04:53 Path Tracing Details - Direct Lighting 00:06:58 Path Tracing Details - Indirect Lighting 00:10:12 Portal with RTX’s New Models and Textures 00:13:02 Alex’s Optimised Settings for Older RTX GPUs 00:17:41 AMD, Intel and DLSS 3 Issues 00:18:46 Conclusion