More noise (day scene, no lights, only hdri)

[akkoxe]

Hi, please help me. I make a day scene only with daylight, no other lights. But i have more noise on picture.
Look please:

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.

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)

[3dgraphics]

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!!!

[akkoxe]

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

[3dgraphics]

try GI from 16 to 32 for example!

[3dgraphics]

by the second image your hdri is your problem i think

[3dgraphics]

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

[akkoxe]

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.

[Ludvik Koutny]

1, What is you secondary GI

2, What color are you walls?

3, Do you use any portals in the scene?

[akkoxe]

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

[3dgraphics]

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

[Ludvik Koutny]

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-