Problems with reflections in animation

[3dkobi]

Hi guys,
I took an old scene I made 3 years ago in VRay and converted it to Corona in order to make some animations. The exterior shots are great but I'm having some problems in the interior...
I attached the first 3 frames - I'm having "flickering" in some areas with high glossiness - You can see it in the kitchen appliances in the back (which I can solve by simply deactivate those reflections), but the main problem is in the wine glasses. The first test render was set to a level of 5.5% noise and took about 1 hour per frame to render (16cores\32 threads machine), than I lowered the noise to 4% - the render took 2 hours per frame but the results are not much better.
The glass material is simple glass (screenshot attached)
So, is this a normal ?Any solution other than loewr the noise level ? I can't lower the noise threshold anymore - render times will get too high....
And another question - When I rendered a certain test frame to picture viewer it took 1 hour. When I rendered the same frame with same settings with Interactive render it took only 47 minuets to get to the same level noise. Why so much difference between the two ?

Peace,
Kobi

[houska]

Hi 3dkobi!

You could try to play with the MSI setting. Look at this article: https://help.c4d.corona-renderer.com/support/solutions/articles/12000035826-what-is-max-sample-intensity-msi-in-corona-renderer-for-cinema-4d-

[3dkobi]

Hi 3dkobi!

You could try to play with the MSI setting. Look at this article: https://help.c4d.corona-renderer.com/support/solutions/articles/12000035826-what-is-max-sample-intensity-msi-in-corona-renderer-for-cinema-4d-

Thanks for the link, I read the article but didn't understand - Should I lower the MSI ?

[houska]

Yes, lower values mean less fireflies. But also less realistic illumination, so be careful. Also, the value of 0 is a special case, which wouldn't work for you, so don't set it to zero.

[3dkobi]

Yes, lower values mean less fireflies. But also less realistic illumination, so be careful. Also, the value of 0 is a special case, which wouldn't work for you, so don't set it to zero.

Thanks, I will try this

[maru]

MSI actually won't affect materials with reflection/refraction glossiness at 1, so here are some other options:
- Lower the reflection and/or refraction glossiness of your materials which are showing the fireflies to something like 0,99 - this will let MSI kick in
- Use bloom and glare and sharpening and blurring in the VFB post (this may be unwanted if you are planning some post processing in other apps)
- Use highlight clamping (not to be mistaken with highlight compression!) - https://help.c4d.corona-renderer.com/support/solutions/articles/12000035830 (this may be unwanted if you are saving to 32 bits as you will lose high dynamic range)
- Fix it in post by clamping/blurring

[3dkobi]

MSI actually won't affect materials with reflection/refraction glossiness at 1, so here are some other options:
- Lower the reflection and/or refraction glossiness of your materials which are showing the fireflies to something like 0,99 - this will let MSI kick in
- Use bloom and glare and sharpening and blurring in the VFB post (this may be unwanted if you are planning some post processing in other apps)
- Use highlight clamping (not to be mistaken with highlight compression!) - https://help.c4d.corona-renderer.com/support/solutions/articles/12000035830 (this may be unwanted if you are saving to 32 bits as you will lose high dynamic range)
- Fix it in post by clamping/blurring

Thanks for the info...
where can I find the "highlight clamping" ?

[maru]

Thanks for the info...
where can I find the "highlight clamping" ?

Have you checked the link I posted in my last message...?
https://help.c4d.corona-renderer.com/support/solutions/articles/12000035830

[3dkobi]

Thanks for the info...
where can I find the "highlight clamping" ?

Have you checked the link I posted in my last message...?
https://help.c4d.corona-renderer.com/support/solutions/articles/12000035830

So sorry, I missed that...
Thanks

[3dkobi]

MSI actually won't affect materials with reflection/refraction glossiness at 1, so here are some other options:
- Lower the reflection and/or refraction glossiness of your materials which are showing the fireflies to something like 0,99 - this will let MSI kick in
- Use bloom and glare and sharpening and blurring in the VFB post (this may be unwanted if you are planning some post processing in other apps)
- Use highlight clamping (not to be mistaken with highlight compression!) - https://help.c4d.corona-renderer.com/support/solutions/articles/12000035830 (this may be unwanted if you are saving to 32 bits as you will lose high dynamic range)
- Fix it in post by clamping/blurring

Thank you very much - using highlight clamping of 1.5 solved this issue

[houska]

Glad it solved the issue for you! Hopefully the lighting in the image isn't too off then...

[Nejc Kilar]

Hmm, while on the topic, what is the difference between MSI and Highlight clamping? If I recall correctly MSI is basically a GI clamp and the Highlight clamping clamps only the image post-linear image while the base calculations aren't changed?

[maru]

Hmm, while on the topic, what is the difference between MSI and Highlight clamping? If I recall correctly MSI is basically a GI clamp and the Highlight clamping clamps only the image post-linear image while the base calculations aren't changed?

The helpdesk knows it all ;)

MSI:
C4D: https://help.c4d.corona-renderer.com/support/solutions/articles/12000035826
3ds Max: https://coronarenderer.freshdesk.com/support/solutions/articles/5000515636

HC:
C4D: https://help.c4d.corona-renderer.com/support/solutions/articles/12000035830
3ds Max: https://coronarenderer.freshdesk.com/support/solutions/articles/12000006462