Black Pixels in Renders

I'm getting black pixels in renders and I have no idea what to adjust to fix the issue.

I think it's related to render settings.

Any help would be appreciated.

Thanks

 

 

Pixel Face.jpg
528 x 534 - 45K

Comments

  • cismiccismic Posts: 629
    tomhelvey said:

    I'm getting black pixels in renders and I have no idea what to adjust to fix the issue.

    I think it's related to render settings.

    Any help would be appreciated.

    Thanks

     

     

    I just published a similar question as lots of oddities in the log file. Not sure where to post those types of questions. 

     

  • davegvdavegv Posts: 164

    They are indeed fireflies 

    There are a number of ways of dealing with them one is to allow longer render times, but this may not remove them if the issue causing them is severe. Generally I find when they are as bright as shown it is either to do with the brightness of the light creating them or the interaction between the light and a specular setting on the surface they appear on. They tend to occur mostly in the shaded area's of a surface with a bright light.

    While there is no direct way of removing them permanently from all renders during rendering, there are various ways to mitigate the effect in a render. As already suggested look at the settings for both the surface casting the light or light source and the Specular/Reflective settings for the surface they are manifesting on. As suggested look at the Glossy Color setting make sure it isn't a stark white and also maybe increase the glossy roughness. WIth the light surface you maybe want to bump it down a little to. 

  • cismiccismic Posts: 629
    davegv said:

    They are indeed fireflies 

    There are a number of ways of dealing with them one is to allow longer render times, but this may not remove them if the issue causing them is severe. Generally I find when they are as bright as shown it is either to do with the brightness of the light creating them or the interaction between the light and a specular setting on the surface they appear on. They tend to occur mostly in the shaded area's of a surface with a bright light.

    While there is no direct way of removing them permanently from all renders during rendering, there are various ways to mitigate the effect in a render. As already suggested look at the settings for both the surface casting the light or light source and the Specular/Reflective settings for the surface they are manifesting on. As suggested look at the Glossy Color setting make sure it isn't a stark white and also maybe increase the glossy roughness. WIth the light surface you maybe want to bump it down a little to. 

    I'll have to give that a go. Thanks for the firefly link.

  • It turned out to be a material issue. After an evening of doing test renders, the Rayne iray skin appears to be broken, all other factors being controlled for: lighting, render settings, filtering, etc. Every other iray skin I tried worked without artifacts. Even the non-iray Rayne skin renders fine. The issue shows up at around 80% and gets progressively worse.

    Thanks for the info on fireflies, I learned a lot last night.

     

     

  • CherubitCherubit Posts: 994

    Hey guys, i know this is an old thread, but i had this problem just now as well, and found out the reason. I'll leave it here if anyone else has this problem in the future and finds this thread. It's because the Draw Dome is OFF in the Render Settings. If you enable draw dome, the black artifacts won't show anymore. smileyyes

  • Cherubit said:

    Hey guys, i know this is an old thread, but i had this problem just now as well, and found out the reason. I'll leave it here if anyone else has this problem in the future and finds this thread. It's because the Draw Dome is OFF in the Render Settings. If you enable draw dome, the black artifacts won't show anymore. smileyyes

    I've noticed odd things happening when I turn the dome off, too. I wanted to do my own lighitng, but the character's face looked like it was covered in zits. Not good. I hadn't connected it to the dome being turned off, but I'll turn it back on and see what happens. Hopefully the light source I painstakingling set up still throws the shadows I wanted. I'll report back if there's a change.

    Maybe there is something going on in the code? Perhaps I could leave the dome on, but then turn dome intensity to zero so it isn't casting light? I know if I turn it up, the light gets brighter, soo... worth a shot!

  • Try using 4.11 - the version of Iray in 4.10 had the issue with Chromatic SSS going transparent with the Dome off, I don't know if this is related.

  • rto3drto3d Posts: 24
    Cherubit said:

    Hey guys, i know this is an old thread, but i had this problem just now as well, and found out the reason. I'll leave it here if anyone else has this problem in the future and finds this thread. It's because the Draw Dome is OFF in the Render Settings. If you enable draw dome, the black artifacts won't show anymore. smileyyes

    Thanks for that !  i greatly appreciate your input .... finally i got rid of the black pixels.

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