Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] General Discussion => Topic started by: Scuffi on 2017-10-05, 15:15:56

Title: Corona 1.7 rc5 - white dots
Post by: Scuffi on 2017-10-05, 15:15:56

Hello to all
I'm doing tests with 1.7 rc crown 5 and I noticed that there are white dots scattered around the image.

Title: Re: Corona 1.7 rc5 - white dots
Post by: Ryuu on 2017-10-05, 15:34:35

I'm sure there are many other ways to get rid of fireflies, but the simplest one would probably be to try and use denoising.

Title: Re: Corona 1.7 rc5 - white dots
Post by: Scuffi on 2017-10-05, 16:08:11

hello Ryuu
denoising is active

Title: Re: Corona 1.7 rc5 - white dots
Post by: romullus on 2017-10-05, 16:20:14

Try not to put bright light sources near very reflective surfaces, or if you have to, then use exclusions or rayswitches.

Title: Re: Corona 1.7 rc5 - white dots
Post by: maru on 2017-10-05, 16:29:04

-How many passes is this?
-Is this beauty element, or some other?
-Are you using LightMix here?
-By looking at other parts of the image, it looks like denoising is not active, or denoising amount is set to 0 or some very low value.

Title: Re: Corona 1.7 rc5 - white dots
Post by: Scuffi on 2017-10-05, 16:46:38

size image 3600x2700
passes 40
do not use LightMix
if you increase the value of the decrease deoising white dots but lose other details that interest me

Title: Re: Corona 1.7 rc5 - white dots
Post by: Scuffi on 2017-10-05, 16:48:13

open and in photoshop are almost gone: O
Now I make a longer rendering.
thank you all

Title: Re: Corona 1.7 rc5 - white dots
Post by: PROH on 2017-10-05, 16:53:48

@Scuffi - Do you know that there is a "remove fireflies only" mode in the denoiser?

Title: Re: Corona 1.7 rc5 - white dots
Post by: Scuffi on 2017-10-05, 17:03:21

Use Corona recently and I'm not ashamed to tell you I do not know how!

Title: Re: Corona 1.7 rc5 - white dots
Post by: Scuffi on 2017-10-05, 17:39:42

I did a little research and I found out now, I think how the DeNoiser.
I'm rendering the image and I have to say that 125 pass virtually disappeared white spots.

Thanks for your help

Title: Re: Corona 1.7 rc5 - white dots
Post by: maru on 2017-10-05, 17:49:53

The dots are probably caused by light shining on the metal/glass parts (caustics). One idea is to use the rayswitch material to exclude the reflective/refractive materials from GI calculations: https://coronarenderer.freshdesk.com/support/solutions/articles/5000529341

Title: Re: Corona 1.7 rc5 - white dots
Post by: Scuffi on 2017-10-06, 09:15:58

Here is the final image (200 pass 1h47Min render time) without DeNoiser.

thanks again to all.

Title: Re: Corona 1.7 rc5 - white dots
Post by: tomislavn on 2017-10-06, 10:21:25

That sofa on the right is floating in the air btw :D

Title: Re: Corona 1.7 rc5 - white dots
Post by: Njen on 2017-10-06, 12:32:00

Do you mind sharing your shader setups for your fabrics?

Title: Re: Corona 1.7 rc5 - white dots
Post by: Scuffi on 2017-10-07, 11:34:05

sorry but yesterday and today I'm out to try to find some work. Monday as soon as I return to the office I write you all the details of the material !!!

Title: Re: Corona 1.7 rc5 - white dots
Post by: Njen on 2017-10-07, 13:38:23

Thank you in advance :D

Title: Re: Corona 1.7 rc5 - white dots
Post by: Scuffi on 2017-10-10, 10:42:33

Here I am!
here you found the characteristics of the material that is very simple and the correct scene hope you like!
thanks again for the tips!