Chaos Corona Forum

General Category => Gallery => Topic started by: aurelarchi on 2015-01-30, 12:36:52

Title: Maison L
Post by: aurelarchi on 2015-01-30, 12:36:52

Hi guys !

A little project done in one week with 3dsmax 2014, Corona (of course) and P.S.
Forest pro for all the vegetation and corona proxy (working well !).
Got problems with noise and some "firefly" in direct light and reflect.  Some crash with DR too.
Sample 64, msi 20, lsm 16.

Hope you like it !

Title: Re: Maison L
Post by: Ricky Johnson on 2015-01-30, 13:25:12

Second image - close up on the orange chairs - looks great! Even with those crazy flare and glow effects going on. Still really like it.

Title: Re: Maison L
Post by: maru on 2015-01-30, 13:30:07

Quote from: aurelarchi on 2015-01-30, 12:36:52

Got problems with noise and some "firefly" in direct light and reflect.  Some crash with DR too.
Sample 64, msi 20, lsm 16.

This means that during each pass you get:
-1AA samples per pixel
-64 GI samples per pixel
-64*16=1024 direct light samples per pixel
While default values are 16 GI samples and 32 direct light samples and they work well in most cases.

Unless it was intentional for some reason, no wonder there were some fireflies/noise problems. 64 GI samples is very high, too.

Title: Re: Maison L
Post by: aurelarchi on 2015-01-30, 13:49:53

Thank for the comments ! :)

Quote

This means that during each pass you get:
-1AA samples per pixel
-64 GI samples per pixel
-64*16=1024 direct light samples per pixel
While default values are 16 GI samples and 32 direct light samples and they work well in most cases.

I know it's very high, but even with this sampling i got noise and bad lighting artefacts.............
But i will test with 16 gi sample and 32 for LSM.

Thank !

Title: Re: Maison L
Post by: maru on 2015-01-30, 14:17:02

16 GI and 2 for LSM. :)

I thing this would suggest that something is wrong with your scene. Maybe materials or geometry? Maybe some light leaks?

Title: Re: Maison L
Post by: aurelarchi on 2015-01-30, 14:42:45

Ah ok ! ;)
Geometry looks correct, hmm what do you mean by light leaks ?

Title: Re: Maison L
Post by: maru on 2015-01-30, 14:48:31

Light leaks may show up for example if you are rendering from inside of a room that has no thickness (walls are planes) or if there is a light source inside an object that has no thickness. Example: https://coronarenderer.freshdesk.com/support/solutions/articles/5000516209

Maybe this will be helpful?
https://coronarenderer.freshdesk.com/support/solutions/articles/5000501983

And here is a method that may help identify whether noise comes from direct or indirect light:
https://coronarenderer.freshdesk.com/support/solutions/articles/5000516731

Sometimes it makes sense to increase GI / direct samples but probably not that much. How many passes did you get in your images?

Title: Re: Maison L
Post by: aurelarchi on 2015-01-30, 14:59:33

Very helpful, thank a lot !