Current tone mapping implementation doesn't support exposure scene referred image by tweak exposure value manually. I think this feature is very usefully when experiment some features like add more lighting term.
For example, if I prototype GI lighting, I definitely don't want the brightness of final image changed due to adaptive tone mapping. I want it looks brighter if this GI term is enabled, and darker if it's disabled. But I can't do it if exposure value is not fixed.
Current tone mapping implementation doesn't support exposure scene referred image by tweak exposure value manually. I think this feature is very usefully when experiment some features like add more lighting term. For example, if I prototype GI lighting, I definitely don't want the brightness of final image changed due to adaptive tone mapping. I want it looks brighter if this GI term is enabled, and darker if it's disabled. But I can't do it if exposure value is not fixed.