Denoiser Include / exclude button

[Arch.Hany]

i really think a great great idea would be introducing an include/exclude button in the denoiser element

because in many cases you would only need denoiser in some relection materials or shadows on certain objects

and you can even add multiple denoiser elements with different values for each case

just imagine how much a setting like this can make you focus on artistic work rather than samples and AA

hope it catches an eye of someone here

[Svetlozar Draganov]

I'll start with the last one since its the least obvious for me:

just imagine how much a setting like this can make you focus on artistic work rather than samples and AA

How adding multiple Denoiser render elements, with different settings, would help the artist to focus more on artistic work?
It's exactly the opposite in my mind, a single element without much technical stuff to do that allows you to clear the whole rendering not just small parts of it would leave more time to focus on artistic job.
How would one know where the noise will be and what Denoise parameters will be needed to clear it, and also what would happen if areas with different settings overlaps and so on?

because in many cases you would only need denoiser in some relection materials or shadows on certain objects

It might not be that difficult to set Denoise maks via Object/Material IDs, which will help denoising specific objects but there is no such thing as ShadowID mask so denoising shadows from specific objects would not be possible. Furthermore, denoising separate objects visible in Reflections/Refractions will not be that easy too.

It sounds much more reasonable for me to use V-Ray Denoiser tool in Nuke to do all those operations during the compositing stage and only if needed, doing them on V-Ray side will be less effective, will costs more time and will introduce more technical work to the artist.

[Arch.Hany]

for example a strong denoiser would work with surfaces that has no texture details
and a mild denoiser would be good for those textured surfaces

right now what option i have to overcome this problem ?
none

with include exclude option ( or mtl id ) you can achieve a perfectly denoised image

and i didnt mean by mentioning reflection or shadow to work on specific elements
i only meant that refelction glossiness and shadows in many cases cause noise on specific objects rgb render
so its would be a way to overcome those issues

[MANUEL_MOUSIOL]

You can always use masks to only use the denoised image where you need it though... In post obviously.

[Arch.Hany]

from my understanding no post work could reproduce the vray denoiser
it generates passes that makes it work better

also i tried makes two vray denoisers one mild and one strong setting but i get only the last one and the other is black
if this works maybe it can help us achieve what we want here

and i would be able to separate each by masks in post

[MANUEL_MOUSIOL]

Then I suggest using the denoiser tool with several settings, save out different results and use what you need.
obviously this doesn't work with nvidia denoiser.