excessive firefly

[sailor]

Hi,

Could someone help me getting rid of excessive firefly? I think it got worse after turning on the displacement. To fix it, do I need to even lower the reflection value of the black tile material? or/and lower the exposure value of the sun's HDRI? The Denoising helps a little bit but not enough. I ran more than 8 hours.

Passes total : 431
Noise level : 3.92%

Please help.

[sailor]

NVM. I figured it out and it was due to the Reflection override.

[Frood]

NVM

Nevermind? No! This is #1 of 19 on my all-time-annoying-Corona-glitches high score list since ages. Number two (denoise rest light select element) has been already fixed :)


Good Luck

[sailor]

really, no??? If you have a map on the reflection override, make sure to uncheck or clear the slot. If you still have firefly after that you should lower reflection value of an offending object's material. That took care of my issue this time. I ran over night and was shocked to see the extreme firefly this morning.

[Frood]

Yes, you can do all kinds of workarounds. But it's still a Corona issue: It should do no harm at all to use reflection override and it should react the same as having the override map in the single map slot. Just wanted to point that out - this is haunting me and others since years now.


Good Luck

[slowgojoe]

For me, In most cases it's a symptom of those materials reflecting something very bright (like a bright point in an HDRI that is entirely out of range and overexposed) You can turn on highlight clamping in image filter settings (under system tab) to reduce those artifacts. Or of course lower the intensity of the light or reflection parameter in the material.

see the corona documentation here to help understand the parameters - https://coronarenderer.freshdesk.com/support/solutions/articles/12000006462-what-is-highlight-clamping-

[sailor]

I noticed that, too and lowered reflection values. I think light intensity affects the most. I tried the highlight clamping but it didn't look good in my case.