Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: akkoxe on 2015-02-28, 22:21:41

Title: More noise (day scene, no lights, only hdri)
Post by: akkoxe on 2015-02-28, 22:21:41

Hi, please help me. I make a day scene only with daylight, no other lights. But i have more noise on picture.
Look please:
(http://s1.sendimage.me/0oXOOl9B.jpeg)
Noise in top left conner. 450 pases. Only HDRI in environment. In window portal, no glass in window.
But when i rendering over 1000 pases, it's not help to.
And second (ready) work.
(http://s1.sendimage.me/Ev3bPl9C.jpeg)
I included other lights, but noise not gone away. And i have some artifacts (this white points, not on wall - its material, only on ceiling)

Title: Re: More noise (day scene, no lights, only hdri)
Post by: 3dgraphics on 2015-02-28, 22:28:22

u have to post your settings, otherwise is no possible to look in concret where the problem is! BTW for this small amount of noise u could use one denoiser
as alternative!!!

Title: Re: More noise (day scene, no lights, only hdri)
Post by: akkoxe on 2015-02-28, 22:32:56

o, sorry, default settings.
Only exposure 2.5 and highlight compress 5.
Standart camera.

Title: Re: More noise (day scene, no lights, only hdri)
Post by: 3dgraphics on 2015-02-28, 22:54:52

try GI from 16 to 32 for example!

Title: Re: More noise (day scene, no lights, only hdri)
Post by: 3dgraphics on 2015-02-28, 22:57:16

by the second image your hdri is your problem i think

Title: Re: More noise (day scene, no lights, only hdri)
Post by: 3dgraphics on 2015-02-28, 23:04:37

look at the quality of you hdri, this can cause the overexposed points!

Title: Re: More noise (day scene, no lights, only hdri)
Post by: akkoxe on 2015-02-28, 23:07:22

I try. Its not helped.
I Try various HDRI. Its not help too. Its Hdri from Dosch HDRI collection.
In two scenes the same HDRI.
(http://i.gyazo.com/49a3b327ddb5d0332b6458b0f2bd159f.png)

Title: Re: More noise (day scene, no lights, only hdri)
Post by: Ludvik Koutny on 2015-02-28, 23:18:18

1, What is you secondary GI

2, What color are you walls?

3, Do you use any portals in the scene?

Title: Re: More noise (day scene, no lights, only hdri)
Post by: akkoxe on 2015-02-28, 23:37:20

HD cache (default)
160. grey.
yes, 1 portal in window.

Title: Re: More noise (day scene, no lights, only hdri)
Post by: 3dgraphics on 2015-03-01, 10:21:40

try with some hdri-pictures from here!!  they are for free!!  http://noemotionhdrs.net/

Title: Re: More noise (day scene, no lights, only hdri)
Post by: Ludvik Koutny on 2015-03-01, 11:30:52

If you place portal wrong, it can do more damage than help. Just make sure the portal is exactly covering outside of the window. That it is not in the middle of a window.

More can be found here: https://coronarenderer.freshdesk.com/support/solutions/articles/5000501660-how-to-use-light-portals-in-corona-