Denoiser very slow

[frame9]

Hello Corona Community!

I am a VraySwitcher ;) and working on my second interior project with Corona.
I am very happy with Corona but I was wondering if it's normal that the Corona Denoiser takes such a long time.

My last image (preview) for example took 30min to render and then 18min to denoise?
Because it's just a preview (test) i stopped at a noise level of 9%
Image size: 3500x2000px
WS: i7 6700K
Slave: i7 8086K

Should i only use the denoiser on images that are already nearly clean?

Thank you for your help,
Tobias

[sprayer]

You can stop rendering and denoiser will start to work or you can hit cancel to abort render and denoiser. IMHO using denoiser at draft render it's waste of time. But 18min. is definitely very slow for 3k image. Did you tried to denoise at WS only? Also check cpu  temperature.

[frame9]

hi sprayer

thanks. yeah i know.
ok. i now tried to let the image render for 60min, noiselevel 7% and the denoiser also takes 18min.
so it seems it has noting to do with the actual noise in the image...
the denoiser is just using the WS. can i also use the slave for denoising?
the cpu temperature is normal

thanks
tobias

[Nekrobul]

How many light mixer layer do you have? And how much ram do you have. Also wich version of corona do you use?

By the way. If you have nvidia GPU you can try to go with the latest DB with ai denoiser wich is almost instant and perfect for previewing.

[frame9]

hi nekrobul

I have 12 light mix layers. Should i bake it in the scene and deactivate the mixer?
32gb ram
version 2.0
"new light solver" (experimental) is activated

[Nekrobul]

hi nekrobul

I have 10 light mix layers. Should i bake it in the scene and deactivate the mixer?
32gb ram
version 2.0
"new light solver" (experimental) is activated

Baking 10 light mixers will reduse this time 10x times and same for the RAM used for denoising, You sould do that 100% if :

- you are rendering final image with corona denoising and not intent to use lightmixer layers in postprocesing
- Planing to use denoising on large scale previews
- having isues with RAM usage

[frame9]

ah! ok!

thank you so much. i will test it right away!

[frame9]

@nekrobul

yeah. that was it! it's 10 times faster now!

thanks again