Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => [Max] Resolved Bugs => Topic started by: cecofuli on 2016-05-17, 15:17:46

Title: Hightlight Clamping: bad result
Post by: cecofuli on 2016-05-17, 15:17:46

Hi

as you can see, it's impossible to obtain a clean AA with the clamp option.
The scene is a bright lamp. but, I have the same problem with windows and strong, bright HDRI as a  Sky.
Only if I use Hightlight Clamping=1 I can obtain a good AA. But, we lost too much information.
I tried all filters, but, without good results.

The only solution is to render as 2X. Then, resize in Photoshop with bicubic interpolation...
I miss the good, old Corona int res parameter....

(http://www.francescolegrenzi.com/Temp/Corona/0069_Clamp.png)

Title: Re: Hightlight Clamping: bad result
Post by: Frood on 2016-05-17, 15:32:48

How many passes are these?

Good Luck

Title: Re: Hightlight Clamping: bad result
Post by: cecofuli on 2016-05-17, 15:48:20

A lot =)

Title: Re: Hightlight Clamping: bad result
Post by: PROH on 2016-05-17, 16:03:56

Hi. Haven't tried it yet in 1,4 final, but used it in dailies with good result - after some testing. One thing I did find out, was that (in my case at least) VFB clamping worked "bad" together with "Highlight compression". Especially if Highlight compression was set to a high number.

So is your result also using Highlight compression?

Title: Re: Hightlight Clamping: bad result
Post by: Ondra on 2016-05-17, 16:06:04

what highlight compression do you use?

Title: Re: Hightlight Clamping: bad result
Post by: cecofuli on 2016-05-17, 17:20:56

(http://www.francescolegrenzi.com/Temp/Corona/0070_Clamp.jpg)

Title: Re: Hightlight Clamping: bad result
Post by: Tanakov on 2016-05-25, 10:22:25

I often have the same problem, how to fix this?

Title: Re: Hightlight Clamping: bad result
Post by: cecofuli on 2016-05-25, 10:58:09

Right now, I think that we have no solution =/

Title: Re: Hightlight Clamping: bad result
Post by: maru on 2016-05-25, 13:07:56

That's strange, but I have trouble reproducing this. I am getting pretty soft edges with similar settings.
Any chance you could share the scene? Here or over the support portal?

Title: Re: Hightlight Clamping: bad result
Post by: arqrenderz on 2016-05-25, 14:34:58

I have the same exact problems, light jaggies dont go away now..

Title: Re: Hightlight Clamping: bad result
Post by: maru on 2016-05-25, 15:34:09

Any example scene would be appreciated:
https://coronarenderer.freshdesk.com/support/tickets/new

Title: Re: Hightlight Clamping: bad result
Post by: cecofuli on 2016-05-25, 17:31:29

Here the files

Title: Re: Hightlight Clamping: bad result
Post by: maru on 2016-05-26, 15:26:43

Here are my tests.
I changed adaptivity recalc to 5 (you had it set to 1 for some reason).
Left the filter at symmetric tent.
500 passes.

Am I wrong or does it look better than in your images?
Maybe your results are so extreme because of the crazy purple-yellow contrast?

Title: Re: Hightlight Clamping: bad result
Post by: cecofuli on 2016-05-26, 15:36:04

Mmm... but, in your test, the lamp color is yellow. In my test, is white.
I don't want to clamp the output...
with clamp = 1, obviously, I have a better AA =)

Title: Re: Hightlight Clamping: bad result
Post by: maru on 2016-05-26, 16:39:47

Quote from: cecofuli on 2016-05-26, 15:36:04

Mmm... but, in your test, the lamp color is yellow. In my test, is white.

I just opened the file and hit F9. No idea why the difference.

Title: Re: Hightlight Clamping: bad result
Post by: cecofuli on 2016-05-26, 16:52:00

Me also...  (-_-)

Title: Re: Hightlight Clamping: bad result
Post by: romullus on 2016-05-26, 16:52:20

Don't know about you guys, but i'm planing to wait for promised bloom and glare filters to put jaggies to end. Highlight clamping might be good for mild intensity overexposed areas, but it's not an option when light intensity is great, like in cecofuli's example.

Title: Re: Hightlight Clamping: bad result
Post by: Ondra on 2016-08-21, 21:48:48

Bloom & Glare now solves the problem nicely

Title: Re: Hightlight Clamping: bad result
Post by: cecofuli on 2016-08-26, 14:08:04

Thanks! =)