Rendering light groups

- [Instructor] Another way to art direct renderings…in post-production is with light groups.…Some advanced renderers automate the process…of rendering different groups of lights as separate files.…When these light group renderings…are combined in post-processing,…the final result is exactly the same…as if the lights had all been rendered together…in a single pass.…This opens up many creative possibilities,…streamlines revisions, and also makes the process…of architectural lighting studies that much easier.…

There's no need to render many different versions…of a scene with different lighting schemes.…We can render all of the lights at once…and instantly enable or disable groups of lights in post.…The basic process is to place individual lights in groups…and render the groups to separate render passes.…This is handled with AOVs, arbitrary output variables,…which are render passes that can carry…many different types of information.…Once the light groups have been rendered out…as separate passes, they can be combined…