Tech Focus: Global Illumination - What It Is, How Does It Work And Why Do We Need It?

Welcome to a brand new Tech Focus! In this video, delivered with early access to DF Supporter Program backers, Alex goes into depth of Global Illumination - or GI. What is it, how does it work, what are the implementations with rasterisation and ray tracing? 00:00 - Introduction 01:13 - Part I - Theory: “What is Global Illumination?“ 04:33 - Part I - Theory: “How does ray tracing simulate lighting?“ 06:45 - Part I - Theory: “How does rasterisation emulate lighting?“ 10:42 - Part 2 - Technique: “Lightmaps“ 17:14 - Part 2 - Technique: “Ambient Colour“ 19:54 - Part 2 - Technique: “Image-based Lighting with Cubemaps“ 27:30 - Part 3 - Technique: “Probe-based Indirect Lighting“ 32:21 - Part 4 - Conclusion Join the DF Patreon 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 o