converting Nuke exposure adjustments to a linear value for Maya?

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  09 September 2011
converting Nuke exposure adjustments to a linear value for Maya?

I make composites in Nuke of different light renderings in Maya:

I like the convenience of being able to tweak the renders with an exposure node without re-rendering. But obviously that's slow, so now I'm looking to find a way to roll those values back into the Maya V-Ray lights so I can do a multi-light draft in Nuke and then render one final in Maya with the tweaked values. The problem is that Exposure adjustments don't map directly to the linear V-Ray for Maya light values. If I find the zero light value in Nuke (lowering the exposure until the image is black) and map that to 0 value in Maya and finding the ratio of my adjustment, it still doesn't work since exposure stops or densities aren't producing linear increases/decreases like the V-Ray lights do.

Is there some simple math I can do to get the exposure value as a ratio (x:1)?
  09 September 2011
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