Dead pixels

iluvchristymack

Hi, I've come back to fiddle with daz after a little while, now with a bit more horsepower (rtx 2080).

I try rendering anything and get a bunch of dead white pixels in the render. For example I was messing around with dforce and wind and got these after 100 and 5000 iterations respectively.

Worth mentioning I'm on 4.11 since I couldn't get my card to work on 4.10. I've also read some of the posts here asking about this but didn't find a fix

JonnyRay

It looks like those are typical "fireflies" that we deal with during Iray rendering. It may take more iterations to converge more completely and it's possible you'll never get rid of all of them without changing your lighting configuration or something. Also, is that a velvet cloth shader? Velvet shaders tend to use SSS in it which can make the calculations harder to converge; so you might want to try with a different cloth shader applied as well to see if it still occurs.

iluvchristymack

Thanks for your answer. I've noticed it happens with different clothing materials (like something from the store) in this case it was indeed the velvet shader. I just now tried silk, carpet and concrete and they all have the same issue. What kind of lighting configurations usually help? I just used dome lighting since it was a quick test for dforce, but should I add more light sources, make them stronger, change temperatures?

Fishtales

To get rid of wayward fireflies, the kind that no matter what you do never go away, I adjust the Nominal Luminance using the slider below the Firefly Filter Enable button. I have mine set at 1500 but that changes with the render and/or lighting, I have had it as low as 100 and up to 3000 at times. It might not be the right way but it works. Be careful if using the Bloom Filter as the settings can kill the bloom as it makes the filter think that the bloom is fireflies.

Ruris

Or just one touch from PS or lightroom healing brush.

iluvchristymack

Fishtales said:

To get rid of wayward fireflies, the kind that no matter what you do never go away, I adjust the Nominal Luminance using the slider below the Firefly Filter Enable button. I have mine set at 1500 but that changes with the render and/or lighting, I have had it as low as 100 and up to 3000 at times. It might not be the right way but it works. Be careful if using the Bloom Filter as the settings can kill the bloom as it makes the filter think that the bloom is fireflies.

Yup the firefly filter fixed it for the most part (on the materials I was testing previously anyways) but even with it on and tinkering with it and lighting I still get some pretty annoying ones, here are some of my test renders (excuse the simplicity but I'm not really acquainted with daz and I try to be as basic as possible to get concepts down) 

So, settings are the same, 2000 iterations denoiser on firefly filter at 15000.

First one is just dome lighting, I noticed some in eyelids / eyelashes mostly in the right eye so I put a spotlight aiming at it 

That somehow made it worse, next I tried to pump a more intense light (from dome) to see what it'd do 

Still having them I fiddled with the Nominal Luminance to 10x

And they are still there.

So my question is, how should I change the light setup to get rid of them? (Also not an expert in the subject but trying to learn)

Fishtales

I hope that is 1500 and not 15000 as you have written :)

You might need to drop it or raise it a bit at a time until they are all gone, even then sometimes there are ones that just wont go away. It is possible you aren't rendering long enough for them to all go.

You say you are at 2000 iterations but what are the other settings? How long is the render running for Max Time? How many samples Max Samples?

iluvchristymack

Yes I meant 1500, damn you typos! 

As for my settings they're default, only changed max time to 0 and disabled render quality, oh and filtering / environment 

Fishtales

I find changing the light temperature (colour)/intensity can help sometimes too as can lowering the Glossiness.