Noise level needs to be calculated from rendered content only

Corona Corona for 3ds Max Feature Requests
1

I have some images that I’m rendering against photographed backplates, used in Direct Visibility Override slot. The rendered model makes only a small portion of the whole image which leads to a super low noise level from the start, even if the rendered model is noisy as hell.
It seems the noise level is calculated over the entire image area which may lead to very inaccurate values. Another negative side effect is is that if I have a noisy image background this may skew the whole noise level calculation and lead to a situation where a desired noise level is never met.

I’d like to request noise level to be calculated on actually rendered content only. Otherwise it’s pretty much impossible to make sure image quality meets a certain level, I imagine this to be true for animation especially where the percentage of rendered content against a background may change a lot.

3

As a middle ground solution we could have a simple checkbox in CoronaOutputMap that lets us exclude that map from noise level calculations.
I agree that DOF and mblur will need sampling, but we definitely need more control over this in case the background is really clean and doesn’t need any sampling other than a few passes of AA.