So... Should we set up one .blend file to render the 3D scene(s), layers, and passes to an OpenEXR file and have a separate .blend file to do compositing of those OpenEXR files? Or is there some way to have everything in a single .blend file but avoid the 3D render when just trying to tweak the compositing. And vice versa (i.e. just render the OpenEXR files pre-compositing)? What's the right organization and workflow?
Thanks, in advance. Really fantastic tutorials (as always).