VERY handy when it comes to complex fly through animations, when camera travels through areas of different lighting
Insight render had it :)
super simple
1) pre-render a frame at a set low res and arrive at a average exposure number, before rendering production size and quality
2) give users a multiplier to manipulate the resulting desired EV up or down
3) to prevent flickering in the animation pre-render (-2, current, +2 frames) and average the EV value out
there may be a smarter way of doing it, but that's how it was handled in Insight, and worked like a charm
thank you!
PS there's always a chance that i'm missing something, and there's already a way to accomplish autoexposure, in which case please point me in the right direction