In depth video - Fast Global Illumination Add Mode By Jamesy on May 22, 2025 Videotutorials Global Illumination calculates simulated how light in a scene behaves. It simulates light bouncing around and spreading diffusely by calculating object proximity, angles and more. It gives quite convincing results, but can be slow. James Crowther shows how to optimise it in your scenes for better rendering times.Just yesterday we released another video on Blender's Fast Global Illumination feature, this time digging into the details and numbers of the "Add Mode". This is quite a technical video, and would be ideal for you if you are wanting to learn more about render optimisation, in particular, how the Add mode works.There's also a bonus where I demo how to recreate Add Mode using a compositor node network and Blender's Ambient Occlusion as an alternative to using Fast Global Illumination's Add mode.I quite liked the results of the node network as it gave more flexibility for being creative and greater control over how the ambient occlusion result is blended with the base image. #depth #video #fast #global #illumination