Denoisers - Corona vs. Intel

Corona Corona for Cinema 4D General
1

So, the new V4 is just great :smiley:
About the new intel denoiser and the corona denoiser - Which is better for what purpose ? Or is it different for each scene ?

Kobi

2

Hi,

the Intel Denoiser is a combination of speed and quality, but it isnā€™t as high quality as the corona denoiser.

Cheers

3

Pretty much this :smiley:

4

Thanks guys

5

Hey 3dkobi

Except that the native Corona denoiser does less denoising on bump maps and round edges (which are a bump map).

So thanks God, they integrated the AI denoiser. Otherwise I would honestly have dumped Corona!

In my projects I could never gain any benefit from that ā€œselectiveā€ denoisingā€¦ in contrary, I find it horrible, since your renders fall apart in noisy and less noisy areas.
And who wants noise that hardly cleans up on rounded edges?
I have discussed this effect with the guys at Corona.

In my opinion, selective denoising is useless and makes quick test renders literally impossible.

Regarding the ā€œhigherā€ quality of the native denoiser, I havenĀ“t really experienced any difference or lower quality of the AI-denoiser.

The AI-denoiser is my new standard.
The other one could be killed from the codeā€¦ in my humble opinion.

6

Thanks for the input on this issue

7

Other notes:

  • AI denoisers ā€œhallucinateā€ in details where there are none, so sometimes they get it wrong. This is especially true with things like say leaves on a tree, grass blades in a field, and so on (the more dense and ā€œrandomā€ that part of the image, the more likely an AI denoiser is to change it in some way)

  • The Intel denoiser may have problems with black or near-black images, where it actually brings the lighting level up. This may be most noticeable in LightMix for instance, and can add a kind of a ā€œglowā€ to things where it shouldnā€™t be (Intel is aware and working on this, afaik)

  • Neither AI denoiser can work with the new High Quality Image Filtering; this is because they have been trained on the other type of filtering on what noise to ā€œexpectā€ in a rendered image. Intel will be/are working with us on retraining it to work with that kind of filtering.

  • Due to the ā€œhallucinationā€ process, the results may change from frame to frame, which could be a problem in animations.

8

TomG, thanks a lot. Good to know about the inconcistency between frames in the AI denoiser.

Any chance the ā€žmore noise rounded edges & bump mapsā€œ will finally disappear from the native Corona denoiser?
As mentioned endless timesā€¦ :smiley: in my eyes this feature makes it hard to use at all.

9

Donā€™t know - the selectively less denoising on areas with bump mapping was added a version or 2 ago, and there is an ongoing discussion about whether it should be kept, reverted, or some other means introduced (like a checkbox to choose, or a separate blending amount for bump map denoised areas and the rest of the image, etc.) So, it is still logged and being looked into here, but no decision yet on what will happen (if anything).