Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => Topic started by: cecofuli on 2020-04-12, 01:53:31

Title: Shadowcatcher bugs: noise and broken Bump spinner
Post by: cecofuli on 2020-04-12, 01:53:31

Hello,

with v5.0, I see a lot of noise in the Composite version (In the Beauty pass, Alpha is fine) generate with the ShadowCatcherMtl (black background) even after 10 minutes (simple car sits on a plane).
If Adaptivity is disabled, the noise is gone after 3-4 minute.
An HDRI (2K) is the only light source.

Also it seems the ShadowCatcherMtl  bump spinner doesn't work.

Can you confirm?

Title: Re: Shadowcatcher bugs: noise and broken Bump spinner
Post by: GeorgeK on 2020-04-13, 15:31:46

Quote from: cecofuli on 2020-04-12, 01:53:31

Hello,

with v5.0, I see a lot of noise in the Composite version (In the Beauty pass, Alpha is fine) generate with the ShadowCatcherMtl (black background) even after 10 minutes (simple car sits on a plane).
If Adaptivity is disabled, the noise is gone after 3-4 minute.
An HDRI (2K) is the only light source.

Also it seems the ShadowCatcherMtl  bump spinner doesn't work.

Can you confirm?

This is for C4D correct?

Title: Re: Shadowcatcher bugs: noise and broken Bump spinner
Post by: cecofuli on 2020-04-13, 21:53:02

No, it's Max.

I think that there is a problem in 3ds Max the Adaptivity engine.
It's like it ignores the extremely dark areas.
The white screenshot is the coposite version in After effect.
When Adaptivity is disabled, as you see, the noise disapperars.
Marcin has already my sample scene.

See you  =)

Title: Re: Shadowcatcher bugs: noise and broken Bump spinner
Post by: maru on 2020-04-14, 15:49:33

I checked this, and here are my results:


My tests were rendered in Max, saved to 32-bit EXR, then composed in Fusion.
Beauty and alpha, then checked with black background, cyan background, and the actual HDRI background.
In all cases, the result with adaptivity enabled is better, or the difference is negligible.
Also, without adaptivity, other areas are getting more noisy - such as reflections in glossy objects.
So to me it seems that everything is working fine - adaptivity helps focus samples where they are most needed, so yes, the dark part of the shadowcatcher will become noisy, but:
- it doesn't matter, since we won't see those areas anyway
- you never place shadowcatcher objects against a fully black or fully white background (however in my examples it didn't matter anyway)

I am waiting for some more specific information how this could be reproduced.

I have some images, but I am not sure if I can share them (Francesco - can you please confirm?).

Looking at the bump spinner issue now...
Update: the bump spinner seems to work fine, too. Waiting for further instructions.