Chaos Corona Forum

Chaos Corona for Cinema 4D => [C4D] General Discussion => Topic started by: Goga abramia on 2018-11-27, 08:30:03

Title: Hot pixels problem
Post by: Goga abramia on 2018-11-27, 08:30:03

Hello, i had some hot pixels problems with renders,Often it happens with exterior renders,With interior everything is ok. I tried many things but the problem is same.

Title: Re: Hot pixels problem
Post by: Nejc Kilar on 2018-11-27, 09:57:28

I'm going out on a limb here but I'd say its probably something with your materials - either too high a bump or weird window materials. That being said, it kind of also looks like the issue could be the sun from the HDRI (if you are using it). Did you mess with the gamma a lot?

Title: Re: Hot pixels problem
Post by: Goga abramia on 2018-11-27, 10:16:25

For glass material it's ok, i tryed render without glass but problem is same, i used HDRI, Corona sky and corona sun. corona sky for global lighting,hdri for reflections and refractios and the sun.for corona sky i used corona compositing with disable seen by camera.

Title: Re: Hot pixels problem
Post by: spawnik on 2018-11-27, 12:28:55

Did you try to set Highlight clamping to 10-20 ?

Title: Re: Hot pixels problem
Post by: koubankeo on 2018-11-27, 12:50:35

Yes, this is an old issue with me. it's often caused by HDRI Haven. Try replacing HDRI maps with another, or changing HDRI rotation.

Title: Re: Hot pixels problem
Post by: maru on 2018-11-27, 13:26:20

Are you using some reflection/refraction overrides? (e.g. an HDRI)
If so, this is a known issue where fireflies appear when using the overrides. Currently the workaround is to remove the overrides, or use an HDRI with less intensive light (e.g. cloudy instead of sunny).