What workflow would you suggest upon the following scenario?
Footage is being shot using a R3D - RedWideGamutRGB - BT1886 - Client wants to work in ACES.
We figured out it would be best for us to work our VFX in EXRs RWG-LOG3G10, We would however need to revew shots as per final output ACES - how can this be possible in Nuke/AE? We need to understand what method to use to convert LOG3G10 to ACES, . Is this possible and how would you suggest converting the LOG3G10 to ACES?
For every color space there’s the “color primarires” and the “linear/non-linear encoding”. For example, REDWideGamutRGB (primaries) Log3G10 (non-linear encoding) or ARRI WideGamut (primaries) LogC (non-linear encoding). So yes if your files are linear REDWideGamutRGB, then you just need to apply a matrix to go from REDWideGamutRGB to AP0. (Note as @nick points out - encoding log data in an EXR is a bad idea)
Again as @nick points out, you can use OCIO with the ACES 1.0.3 config and set the color space and linear/non-linear encoding separately. You could “brew your own” color science and apply a matrix node manually but that’s only advised for people who know very well what they’re doing. Even then, an excellent tool (OCIO) already exists and is in wide use for applying these sorts of simple transformations.