Clumpy fog occurs in nature. Is there a more efficient way of creating it than nesting odd shaped volumes in the atmosphere?
You could try painted alphas on layered cards ? Possibly even animated ones. Not only will you have total precise control. It will be super fast to render too. I did it this way a few times in the past for otherwise very difficult layers of fog and random smoke and clouds in scenes and it was really effective. Volumetric lighting is not going to work with it. But if you need that perhaps combine with a generic environment fog pass. Or perhaps fake volumetric with painted alpha cards too. It depends on the scene and the look. Unfortunately I don’t have any past examples up on line. But perhaps give it a quick try out.
Great idea, thanks