I started with a vague entity update concept, but once I just went through and listed the entities I wanted, it was much easier. I had projector entities I wanted updated before the render, so I put in an UpdateProjectors() command.
It can be intimidating, because you might not know all the entities you want, but you have got to list them and know what they do and when they update.
It can be intimidating, because you might not know all the entities you want, but you have got to list them and know what they do and when they update.